Windings, high voltage windings and dry type transformers

Abstract

The present invention relates to a winding body (1310) used in a high-voltage winding (130). The winding body (1310) includes a plurality of winding plates (1313), each of which is provided with a plurality of winding grooves (1314) so ​​as to form a plurality of comb teeth on the winding plate (1313), and at least one auxiliary member (5316), the auxiliary member (5316) being annular, the winding plates (1313) being provided along the circumferential direction of the auxiliary member (5316), and the auxiliary member (5316) being fixedly connected to the winding plate (1313). The present invention further relates to a high-voltage winding (130). The high-voltage winding (130) includes the above-mentioned winding body (1310), a high-voltage coil (1320), and a high-voltage insulating layer (1330). The present invention further relates to a dry-type transformer (10). The dry-type transformer (10) includes an iron core (110), a low-voltage winding (120), and the above-mentioned high-voltage winding (130), where the low-voltage winding (120) is fitted around the iron core (110), and the high-voltage winding (130) is fitted around the low-voltage winding (120).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to a Chinese patent application filed on December 29, 2021, bearing application number 2021116441856 and titled "Winding body and high-voltage winding for high-voltage winding", and a Chinese patent application filed on December 29, 2021, bearing application number 2021116479228 and titled "Dry-type transformer", the contents of which are incorporated by reference in their entirety into this application. [Technical field]

[0002] The present invention relates to the technical field of power transformers, and in particular to a winding body, a high-voltage winding including the winding body, and a dry-type transformer including the high-voltage winding. [Background technology]

[0003] At present, transformers are classified into oil-filled transformers, dry-type transformers, and gas transformers. Dry-type transformers have the advantages of being oil-free, fireproof, long life, energy-saving, low noise, easy to maintain, and safe and reliable. Most of the dry-type transformers currently on the market are dry-type transformers with resin-cast high-voltage windings and open-type dry-type transformers. Dry-type transformers have made great advances in the past decade, but they still have problems such as insulation cracking during operation, poor thermal conductivity, and harsh operating environments.

[0004] In particular, with regard to the configuration of the high-voltage winding of a dry-type transformer, currently, when winding a conductor inside the high-voltage winding, the conductor is wound directly around a tool to form the high-voltage coil, and then the high-voltage winding is cast to form it. This results in poor heat dissipation capability of the high-voltage coil and poor short-circuit shock resistance capability. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the shortcomings of the prior art, the present invention aims to provide a winding body of a high-voltage winding, a high-voltage winding including the winding body, and a dry-type transformer including the high-voltage winding. The winding body of a high-voltage winding, the high-voltage winding including the winding body, and the dry-type transformer including the high-voltage winding provided by the present invention have better fire resistance, aging resistance, and short circuit resistance test capabilities, the coil is recyclable, has low energy consumption, is energy-saving, and is environmentally friendly, and the insulating layer is stable, has good mechanical performance, and has a long service life. [Means for solving the problem]

[0006] One aspect of the present invention provides a winding body used for a high-voltage winding, the winding body comprising: a plurality of winding plates, each of which has a plurality of winding grooves so as to form a plurality of comb teeth in the winding plate; and at least one auxiliary member, the auxiliary member being annular, the winding plates being provided along a circumferential direction of the auxiliary member, and the auxiliary member being fixedly connected to the winding plate.

[0007] In one embodiment, when the height of the comb teeth along the longitudinal direction of the winding plate is defined as the tooth height, the tooth height of the comb teeth in the central part of the winding plate and the tooth height of the comb teeth at both ends of the winding plate are both greater than the tooth height of the comb teeth in other parts of the winding plate.

[0008] In one embodiment, the winding body further includes a support tube which is a hollow cylinder, and the multiple winding plates are evenly arranged circumferentially on the outer circumferential surface of the support tube, and the longitudinal direction of each of the winding plates is aligned along the axial direction of the support tube.

[0009] In one embodiment, a first high comb tooth region, a first low comb tooth region, a second high comb tooth region, a second low comb tooth region, and a third high comb tooth region are formed in this order on the winding plate from one end to the other end along a longitudinal direction of the winding plate, the first high comb tooth region and the third high comb tooth region are disposed symmetrically with respect to the second high comb tooth region, and the first low comb tooth region and the second low comb tooth region are disposed symmetrically with respect to the second high comb tooth region.

[0010] In one embodiment, the auxiliary member is located on an outer circumferential surface of the support tube, and extends outward along a radial direction of the support tube to form an annular shape surrounding the support tube.

[0011] In one embodiment, the winding plates or the auxiliary members are provided with locking grooves, and the winding plates and the auxiliary members are engaged and connected by the locking grooves.

[0012] In one embodiment, the auxiliary member includes an intermediate auxiliary member provided on an inner wall of the winding plate.

[0013] In one embodiment, the auxiliary member includes an end auxiliary member provided on the outer side of the end of the winding plate.

[0014] In one embodiment, the winding is manufactured from a fiber reinforced composite material.

[0015] In one embodiment, both ends of the winding plate are provided with flow grooves.

[0016] In one embodiment, a plurality of said backing members are provided, said plurality of backing members being spaced apart in an axial direction of said backing members.

[0017] Another aspect of the present invention provides a high-voltage winding comprising a winding body according to any of the above-described embodiments, a high-voltage coil, and a high-voltage insulating layer, wherein a conductor is wound around the winding body to form a high-voltage coil, and the entire outside of the high-voltage coil is covered with the high-voltage insulating layer.

[0018] In one embodiment, the conductor includes a first conductor and a second conductor, the first conductor being wound from one end of the winding body along the longitudinal direction of the winding plate to a central portion of the winding body, and the second conductor being wound from the central portion of the winding body along the longitudinal direction of the winding plate to the other end of the winding body.

[0019] In one embodiment, the high voltage insulating layer is formed in the gap between the high voltage coil and the winding. is filled and Both ends of the winding body Covered , the high voltage insulating layer is injection molded silicone rubber.

[0020] In one embodiment, the injection molded silicone rubber is high temperature vulcanization silicone rubber or injectable liquid silicone rubber.

[0021] In one embodiment, the high-voltage coil includes a multi-segment coil, the conductor is wound in the winding groove such that the multi-segment coil is spaced apart along the axial direction of the high-voltage winding, and at least one segment of the coil is provided between two adjacent comb teeth on the winding plate.

[0022] In one embodiment, the coils of each section are wound back and forth in layers along the axial direction of the high-voltage winding, and are densely arranged on the outer circumferential surface of the winding body.

[0023] In one embodiment, the coil is provided with at least one layer of interlayer insulation along the axial direction of the high voltage winding, the interlayer insulation being a long strip of insulation with corrugated edges.

[0024] Another aspect of the present invention provides a dry-type transformer comprising an iron core, a low-voltage winding, and a high-voltage winding according to any one of the above-described embodiments, wherein the low-voltage winding is fitted onto the iron core, and the high-voltage winding is fitted onto the low-voltage winding.

[0025] In one embodiment, four core clamps are provided on the outside of the iron core, and the core clamps are made of fiber reinforced composite material.

[0026] In one embodiment, the core clamp is pressed or pultruded from a fibrous material impregnated with epoxy resin.

[0027] In one embodiment, the low voltage winding includes copper foils and low voltage insulating layers, the copper foils and the low voltage insulating layers being arranged alternately.

[0028] In one embodiment, the low voltage insulating layer is SHS-P diphenyl ether prepreg or silicone rubber film.

[0029] In one embodiment, at least one heat dissipation gas passage is provided in the low-voltage winding, and the heat dissipation gas passage is located between the copper foil and the low-voltage insulating layer. [Brief description of the drawings]

[0030] The above and other objects, features and advantages of the present invention will become more apparent from a more detailed description of the preferred embodiment of the present invention shown in the drawings, in which the same reference numerals indicate the same parts, and the drawings are not drawn to scale and are primarily intended to illustrate the gist of the invention. Other features, objects and advantages of the present invention will become apparent from the following detailed description of the accompanying drawings and non-limiting embodiments. [Figure 1] FIG. 1 is a front view of a dry-type transformer according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a plan view of a dry-type transformer according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a front view of an assembled core according to an embodiment of the present invention. [Figure 4] FIG. 3 is an enlarged view of a portion G in FIG. 2. [Diagram 5] FIG. 2 is a front view of a core clamp according to an embodiment of the present invention. [Figure 6]FIG. 2 is a side view of a core clamp according to an embodiment of the present invention. [Figure 7] FIG. 1 is a front view of a dry-type transformer according to an embodiment of the present invention. [Figure 8] FIG. 2 is a side view of a dry-type transformer according to an embodiment of the present invention. [Figure 9] FIG. 2 is a side view of a lower clamp according to one embodiment of the present invention. [Figure 10] FIG. 2 is a schematic perspective view of a winding body according to an embodiment of the present invention. [Figure 11] FIG. 2 is a cross-sectional view of a support cylinder according to an embodiment of the present invention. [Figure 12] FIG. 2 is a schematic perspective view of a high-voltage coil wound around a winding body according to an embodiment of the present invention. [Figure 13] FIG. 2 is a schematic perspective view of a high-voltage winding according to an embodiment of the present invention. [Figure 14] 1 is a schematic perspective view of a tool connection member according to an embodiment of the present invention; [Figure 15] FIG. 2 is a schematic diagram of the wiring of a high voltage coil in one embodiment of the present invention. [Figure 16] FIG. 2 is a partial cross-sectional view of a high voltage winding according to one embodiment of the present invention. [Figure 17] FIG. 2 is a partial cross-sectional view of a high voltage winding according to one embodiment of the present invention. [Figure 18] FIG. 2 is a partial cross-sectional view of a high voltage winding according to one embodiment of the present invention. [Figure 19] FIG. 2 is a partial cross-sectional view of a high voltage winding according to one embodiment of the present invention. [Figure 20] FIG. 2 is a schematic perspective view of a winding body according to an embodiment of the present invention. [Figure 21] FIG. 21 is an enlarged view of the position H in FIG. 20. [Figure 22] FIG. 2 is a schematic perspective view of a support cylinder according to an embodiment of the present invention. [Diagram 23] FIG. 23 is an enlarged view of a portion J in FIG. 22. [Figure 24] FIG. 2 is a schematic perspective view of a winding portion according to an embodiment of the present invention. [Diagram 25] FIG. 2 is a schematic perspective view of an auxiliary member according to an embodiment of the present invention. [Figure 26]FIG. 2 is a schematic perspective view of a high-voltage winding according to an embodiment of the present invention. [Figure 27] FIG. 2 is a schematic perspective view of a high-voltage coil wound around a winding portion according to an embodiment of the present invention. [Figure 28] FIG. 2 is a schematic perspective view of a connection between a winding portion and an auxiliary member according to an embodiment of the present invention. [Figure 29] 29 is an enlarged schematic view of a fixing portion between the winding portion and the end support member in FIG. 28. FIG. [Diagram 30] 29 is an enlarged schematic view of a fixed portion between the winding portion and the intermediate auxiliary member in FIG. 28. FIG. [Diagram 31] FIG. 2 is a schematic perspective view of a high-voltage winding according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] As required, specific embodiments of the present invention are disclosed herein. However, it should be understood that the embodiments disclosed herein are merely exemplary of the present invention, which may be expressed in various forms. Therefore, the specific details disclosed herein are not to be considered as limiting, but are merely representative basis for teaching those skilled in the art to apply the present invention in different forms in any suitable manner in practice, including the basis of claims and the employment of various features disclosed herein in combination with features not expressly disclosed herein.

[0032] "Connection" described in the present invention is understood in a broad sense unless clearly specified or limited, and may be either a direct connection or a connection through an intermediate medium. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by "upper", "lower", "end", "one end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for facilitating and simplifying the description of the present invention, and is not intended to limit the present invention, since it does not indicate or imply that the mentioned device or element must have a specific orientation, be configured, and operate in a specific orientation.

[0033] As shown in Fig. 1 to Fig. 3, in one embodiment of the present invention, the dry-type transformer 10 is a three-phase transformer including phases A, B, and C. That is, the dry-type transformer 10 includes three single-phase transformers 100. Depending on the structure of the iron core 110, the three transformers 100 may be arranged to form a linear structure or a triangular structure, and the three transformers 100 may have a symmetrical structure. The dry-type transformer 10 may be an insulating transformer, an inverter transformer, a test transformer, or the like.

[0034] 1 to 3, in one embodiment of the present invention, three transformers 100 are arranged to form a linear structure, and the dry-type transformer 10 includes an iron core 110, three low-voltage windings 120, and three high-voltage windings 130. The iron core 110, the low-voltage windings 120, and the high-voltage windings 130 are arranged in order from the inside to the outside. Specifically, the iron core 110 includes three columnar core bodies 111, an upper yoke 112 located at the upper ends of the three columnar core bodies 111, and a lower yoke 113 located at the lower ends of the three columnar core bodies 111. One low-voltage winding 120 is fitted around the outer periphery of each columnar core body 111, and one high-voltage winding 130 is fitted around the outer periphery of each low-voltage winding 120. That is, one low-voltage winding 120 and one high-voltage winding 130 are fitted around each columnar core body 111 in order from the inside to the outside. The core 110, the low-voltage winding 120, and the high-voltage winding 130 are arranged coaxially, that is, the three have the same axial direction. The columnar core body 111 is formed by binding and fixing the outer side of a multi-layered silicon steel plate with a cable tie. Optionally, the radial cross section of the columnar core body 111 is approximately elliptical, circular, or other shapes. The radial cross section of the columnar core body 111 can be selected to have an appropriate shape according to actual needs as long as the columnar core body 111 can be accommodated in the hollow cavity of the low-voltage winding 120, but is not limited here. Similarly, the upper yoke 112 and the lower yoke 113 are also formed from a multi-layered silicon steel plate. The three columnar core bodies 111 are fixedly connected by an upper yoke 112 and a lower yoke 113 to form the core 110 .

[0035] In one embodiment of the present invention, a method for easily assembling the iron core 110, the low-voltage winding 120, and the high-voltage winding 130 is provided. Specifically, the lower yoke 113 of the iron core 110 is first arranged at the bottom of the dry-type transformer 10 by laminating multiple layers of silicon steel plates, then multiple layers of silicon steel plates are inserted at both ends and the middle of the lower yoke 113 to form three columnar core bodies 111, then the low-voltage winding 120 and the high-voltage winding 130 are fitted in sequence from the inside to the outside around the outer periphery of the columnar core body 111, and finally, multiple layers of silicon steel plates are horizontally inserted at the upper ends of the three columnar core bodies 111 to form the upper yoke 112. In this manner, the assembly of the iron core 110, the low-voltage winding 120, and the high-voltage winding 130 is completed.

[0036] 1, 2, 5 and 6 in combination, a core clamp 140 for clamping the iron core 110 is provided on the outside of the iron core 110. The core clamp 140 is formed by connecting three clamps to each other, and all three clamps are plate-shaped members. The clamp at the middle position is defined as a first clamp 142, and the remaining two clamps are defined as second clamps 143. The two second clamps 143 extend in the same direction on both sides where the first clamp 142 is connected to the two second clamps 143, so that the core clamp 140 has a structure like a channel steel, that is, the core clamp 140 has a "V"-shaped structure. Preferably, the second clamp 143 is disposed perpendicular to the first clamp 142. The first clamp 142 is for closely contacting the iron core 110, and the second clamp 143 extends in a direction away from the iron core 110. After the core clamp 140 is installed, the plate surface of the first clamp 142 is arranged along the axial direction of the iron core 110, and the plate surface of the second clamp 143 is arranged along the radial direction of the iron core 110. Specifically, in one embodiment according to the present invention, the axial direction of the iron core 110 is vertical, and the radial direction of the iron core 110 is horizontal. Of course, in other embodiments, the core clamp may be a rectangular hollow tube, that is, the core clamp has a closed structure formed by four plate-shaped clamps connected to each other and surrounding each other. The closed structure makes the structure of the core clamp more stable. Optionally, the core clamp may have a closed structure formed by five, six, or more plate-shaped clamps connected to each other and surrounding each other, but is not limited thereto.

[0037] In one embodiment of the present invention, four core clamps 140 are provided, two of which are symmetrically disposed on both sides of the upper end of the core 110 to fasten the upper end (i.e., the upper yoke 112) of the core 110, and are fixedly connected by a first fastening member. The other two core clamps 140 are symmetrically disposed on both sides of the lower end of the core 110 to fasten the lower end (i.e., the lower yoke 113) of the core 110, and are fixedly connected by a second fastening member. Preferably, the first fastening member and the second fastening member are a plurality of screws and bolts used in cooperation with each other to fasten both ends of the core 110 by the two core clamps 140, respectively. Both ends of the core clamps 140 are provided with a first through hole 141. Specifically, both ends of the first clamp 142 are provided with one first through hole 141. Two core clamps 140 are disposed on both sides of the upper end of the core 110, and a screw (not shown) is simultaneously inserted into two first through holes 141 at the same end of the two core clamps 140, and then the two clamps 140 are fastened with a bolt to fasten both ends of the two core clamps 140, thereby fastening the upper end of the core 110 with the two core clamps 140. The two core clamps 140 at the lower end of the core 110 are also fastened in a similar manner to fasten the lower end of the core 110, and therefore will not be described in detail again. Optionally, in order to fasten the core 110 more reliably, the center of the core 110 can be fastened with a plurality of screws and bolts used in cooperation with each other at the intermediate portion of the core clamps 140. The second clamp 143 is further provided with a second through hole (not shown) for connection with the low-voltage winding 120.

[0038] In this embodiment, the two core clamps 140 at the upper end are located above the high-voltage winding 130 provided on the outer periphery of the iron core 110. A plurality of insulating pads 1001 are provided on the top of the high-voltage winding 130 to support the two core clamps 140 at the upper end and to maintain a safe electrical distance between the low-voltage winding 120 and the high-voltage winding 130 and the upper yoke 112, respectively. Similarly, the two core clamps 140 at the lower end are located below the high-voltage winding 130 provided on the outer periphery of the iron core 110. A plurality of insulating pads 1001 are also provided on the top of the two core clamps 140 at the lower end to support the low-voltage winding 120 and the high-voltage winding 130 and to maintain a safe electrical distance between the low-voltage winding 120 and the high-voltage winding 130 and the lower yoke 113, respectively. Alternatively, the insulating pad 1001 may be made from an insulating material, for example a low shrink unsaturated polyester glass fiber reinforced molding compound such as Dough Molding Compound (DMC), Sheet Molding Compound (SMC), or cast from, for example, an epoxy resin.

[0039] The core clamp 140 is made of a fiber reinforced composite material. Specifically, the core clamp 140 is pressed from glass fiber impregnated with epoxy resin, or pressed from aramid fiber impregnated with epoxy resin. Alternatively, the core clamp 140 may be made from other composite materials. Alternatively, the first clamp 142 and the second clamp 143 are integrally molded.

[0040] The fiber-reinforced composite material refers to a composite material formed by subjecting a reinforcing fiber material, such as glass fiber or aramid fiber, and a matrix material to a molding process, such as winding molding, press molding, or pultrusion molding.

[0041] Optionally, in another embodiment of the present invention, the core clamp may be made of a metal material, for example, the first clamp and the second clamp may be different side walls of an integrally molded channel steel, or may be molded separately and then connected and fixed by welding. Since the core clamp is made of a metal material, it is necessary to connect an insulating part such as a small column insulator to the outside of the core clamp to insulate the junction between the high voltage and low voltage and the metal channel steel. At the same time, it is necessary to provide an insulating pad on the outside of the core to insulate the core from the core clamp, while avoiding the electromagnetic loss of the core caused by the eddy current generated in the core clamp.

[0042] The core clamp 140 provided by the embodiment of the present invention is manufactured from a fiber-reinforced composite material, and therefore, compared with the core clamp of the conventional channel steel structure, the core clamp 140 has better economical efficiency, that is, on the one hand, the insulating pad fixed on the outer surface of the iron core 110 can be omitted, and on the other hand, the fiber-reinforced composite material is less expensive than the metal material, and the overall cost can be reduced by about 60%. Furthermore, since the conventional channel steel structure is a conductive metal material, it is necessary to connect additional insulating parts such as a column insulator to the core clamp for insulation. In this way, on the one hand, the cost increases, and on the other hand, the weight of the entire device increases, the noise during the operation of the device increases, and the carbon emission during the production of iron products increases, resulting in serious pollution. In contrast, the core clamp 140 manufactured from the fiber-reinforced composite material solves these problems. Furthermore, the core clamp 140 manufactured from the fiber-reinforced composite material reduces the no-load loss of the dry-type transformer 10 without generating eddy current loss in the composite. As can be seen, the core clamp 140 made from fiber reinforced composite materials has lower cost, lighter weight, better mechanical performance, lower carbon emissions during the production of the fiber reinforced composite materials, and is more environmentally friendly.

[0043] As shown in Figures 2 and 4, the low-voltage winding 120 includes a copper foil 121, a low-voltage insulating layer 122, and a support strip 123, and the copper foil 121 and the low-voltage insulating layer 122 are arranged alternately. The copper foil 121 is formed by winding a whole copper foil paper, and the low-voltage insulating layer 122 and the copper foil 121 are laminated and then wound together to achieve the alternating arrangement of the copper foil 121 and the low-voltage insulating layer 122. At least one heat dissipation gas passage is provided in the low-voltage winding 120, and the heat dissipation gas passage is located between the adjacent copper foil 121 and the low-voltage insulating layer 122. The support strip 123 is located in the heat dissipation gas passage and is used to support and isolate the adjacent copper foil 121 and the low-voltage insulating layer 122. Specifically, when the copper foil 121 and the low-voltage insulating layer 122 are laminated to a predetermined thickness and wound, the support strip 123 is fixed to the outer surface of the low-voltage insulating layer 122 or the copper foil 121, and then the laminated and wound are continued so that the copper foil 121 or the low-voltage insulating layer 122 is in close contact with the support strip 123. Alternatively, the support strip 123 may be fixed between the adjacent copper foil 121 and the low-voltage insulating layer 122 by adhesion, or may be fixed by a pressing force generated during winding or other methods. A plurality of support strips 123 are provided in the heat dissipation gas passage of each layer, and the plurality of support strips 123 are provided at intervals along the circumferential direction of the outer circumferential surface of the copper foil 121 to support the adjacent copper foil 121 and the low-voltage insulating layer 122. At least two support strips 123 are provided in the heat dissipation gas passage of each layer. Alternatively, two, three, four, or more support strips 123 may be provided. Preferably, the multiple support strips 123 of the same layer are provided at equal intervals along the circumferential direction of the outer peripheral surface of the copper foil 121. After providing the support strips 123, the copper foil 121 and the low-voltage insulating layer 122 are laminated to a predetermined thickness and continuously wound to form the low-voltage winding 120. The heat dissipation gas passage is advantageous for dissipating heat generated in the low-voltage winding 120 during the operation of the dry-type transformer 10, and aims to avoid overheating failure due to heat accumulation of the dry-type transformer 10. Optionally, the heat dissipation gas passage may be provided in one layer, or in two or more layers, but is not limited here.

[0044] The low-voltage insulating layer 122 may be made of polyimide-impregnated paper, specifically SHS-P diphenyl ether prepreg, which is made by impregnating a soft composite material of polyimide film and polysulfone fiber nonwoven fabric with diphenyl ether resin and then baking it. Of course, the low-voltage insulating layer may also be made of DMD insulating paper or silicone rubber film or other insulating materials, which may be selected according to different temperature rise levels of the dry-type transformer.

[0045] Optionally, the support strip is an insulating support strip made of epoxy resin-impregnated glass fiber or epoxy resin-impregnated aramid fiber. Optionally, the support strip is a long strip with a cross section in the shape of a letter "U", which has more stable mechanical strength. Optionally, the support strip may be a long strip with a square or other shaped cross section, as long as it can play the role of supporting and isolating. Optionally, the support strip may be made of materials such as aluminum tubes.

[0046] The inner layer of the low-voltage winding 120 is further provided with an inner copper lead row, and the outer layer of the low-voltage winding 120 is further provided with an outer copper lead row. The free ends of the inner copper lead row and the outer copper lead row are provided with connection holes, which are aligned with the second through hole of the core clamp 140 and fastened to each other.

[0047] In another embodiment, as shown in Figs. 7 to 9, the core clamp of the dry-type transformer 20 includes two upper clamps 240 and two lower clamps 250, the upper clamps 240 have the same structure as the core clamp 140 described above, are made of fiber-reinforced composite material, and will not be described in detail again. The two lower clamps 250 are connected and attached to both sides of the core 210 by a number of screws and bolts used in cooperation with each other, specifically, connected and attached to both sides of the lower yoke 213, and the bottoms of the lower clamps 250 are connected to the ground leg 202 by bolts to form a frame structure. Then, the low-voltage winding and the high-voltage winding are fitted from the top to the bottom onto the core 210, and the bottoms of the low-voltage winding and the high-voltage winding are both directly located in the lower clamps 250, and finally, other parts are attached.

[0048] In this embodiment, the lower clamp 250 is different from the upper clamp 240 in that it is designed as a rectangular hollow tube, i.e., the lower clamp 250 has a closed structure formed by four plate-like structure clamps connected to each other and surrounding them. Because the lower clamp 250 needs to bear the gravity load of components such as low-voltage windings and high-voltage windings, this structure allows the lower clamp 250 to bear higher mechanical strength and is more stable.

[0049] 8 and 9 in combination, the four clamps of the lower clamp 250 include two first clamps 252 arranged along the vertical direction and two second clamps 253 arranged along the horizontal direction. The two first clamps 252 and the two second clamps 253 have a closed rectangular structure formed by connecting and surrounding each other. One of the first clamps 252 is provided in close contact with the lower yoke 213, one of the second clamps 253 is provided in close contact with the low-voltage winding and the high-voltage winding, and the other second clamp 253 is connected to the ground leg 202 by a bolt. Optionally, the axial height of the first clamp 252 of the iron core 210 is set to be larger. In this way, the bottoms of the low-voltage winding and the high-voltage winding are directly located on the second clamp 253, and at the same time, a certain gap M is left between the lower yoke 213 and the low-voltage winding and the high-voltage winding, and this gap M can maintain a safe electrical distance between the lower ends of the low-voltage winding and the high-voltage wire winding and the lower yoke 213, respectively, so that it is possible to avoid providing insulating pads between the lower clamp 250 and the low-voltage winding and the high-voltage wire winding, thereby saving costs.

[0050] The lower clamp 250 is made of a fiber-reinforced composite material, specifically, made of glass fiber impregnated with epoxy resin. The lower clamp 250 made of glass fiber impregnated with epoxy resin is lightweight, has good insulation performance, and has high mechanical strength, so that the low-voltage winding and the high-voltage winding can be directly placed on the lower clamp 250 without the need for other support pad structures, thus saving the manufacturing cost and reducing the weight of the product. Furthermore, since the support pad structure is not required, on the one hand, the step of adjusting the position and direction of the pad can be omitted, and the time for assembling and placing the product can be saved to improve the assembly efficiency of the product, and on the other hand, the stability of the entire configuration of the dry-type transformer can be strengthened, and the risk of displacement of the low-voltage winding and the high-voltage winding and the change of the electrical distance due to defects such as the displacement of the pad during the transportation of the product can be avoided.

[0051] As shown in FIGS. 10 to 15, the high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320, and a high-voltage insulating layer 1330, and the conductor is wound around the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 includes a support tube 1311 and a winding section 1312. The support tube 1311 is a hollow column, and may be a hollow cylinder, a hollow elliptical cylinder, or another hollow columnar body. The winding section 1312 is provided on the outer circumferential surface of the support tube 1311, and the conductor is wound around the winding section 1312 to form the high-voltage coil 1320. The high-voltage coil 1320 includes a multi-segment coil arranged at intervals along the axial direction of the support tube 1311. The axial direction of the winding body 1310 and the axial direction of the high-voltage winding 130 are the same direction.

[0052] The winding section 1312 includes a plurality of winding plates 1313, which are arranged at equal intervals on the outer circumferential surface of the support tube 1311 in the circumferential direction of the support tube 1311. Each winding plate 1313 extends along the axial direction of the support tube 1311, and the length of the winding plate 1313 along the axial direction of the support tube 1311 is smaller than the length of the support tube 1311 along the axial direction. The number of the winding plates 1313 is at least two. Alternatively, the number of the winding plates 1313 may be two, three, four or more, but is not limited here. Preferably, the number of the winding plates 1313 of a dry-type transformer (e.g., a 10 kV / 1000 kVA dry-type transformer) is 12 in order to ensure reliable winding of the conductor and to save as much material as possible. In another embodiment, the length of the winding plate extending along the axial direction of the support tube may be equal to the length of the support tube extending along the axial direction.

[0053] The winding plate 1313 is a rectangular plate-like member, and a longer side edge of the winding plate 1313 is provided along the axial direction of the support tube 1311, i.e., the longitudinal direction of the winding plate 1313 is provided along the axial direction of the support tube 1311. The winding plate 1313 is further provided with a plurality of winding grooves 1314, which extend along the radial direction of the support tube 1311 and are distributed at intervals along the axial direction of the support tube 1311 so that the winding plate 1313 has a comb-tooth shape, i.e., a plurality of comb teeth are formed on the winding plate 1313. If the height of the comb teeth on the winding plate 1313 along the axial direction of the support tube 1311 is defined as the tooth height, it is preferable that the height of the teeth of the comb teeth at both ends of the winding plate 1313 and the height of the teeth of the comb teeth at the center of the winding plate 1313 are both greater than the height of the teeth of the comb teeth in other portions. Since the electric field strength at the ends of the high-voltage coil 1320 is not uniform, the electric field can be made uniform by designing the height of the teeth at both ends of the winding plate 1313 to be larger. In addition, since the tap of the tap wire needs to be drawn out from the center of the winding plate 1313, if the height of the teeth at the center of the winding plate 1313 is designed to be larger, the distance between two corresponding adjacent winding grooves 1314 also becomes larger, and a space for arranging the tap drawn out from the center of the winding plate 1313 can be secured. A comb tooth region with a larger tooth height is defined as a high comb tooth region, and a comb tooth region with a smaller tooth height is defined as a low comb tooth region. By providing as described above, a first high comb tooth region, a first low comb tooth region, a second high comb tooth region, a second low comb tooth region, and a third high comb tooth region are formed in this order from one end to the other end in the axial direction of the support tube 1311 of the winding plate 1313. Furthermore, the heights of the teeth of the first high comb tooth region, the second high comb tooth region, and the third high comb tooth region are not particularly limited, and may be the same as or different from each other, for example. Optionally, the first high comb tooth region and the third high comb tooth region are arranged symmetrically with respect to the second high comb tooth region, and the first low comb tooth region and the second low comb tooth region are arranged symmetrically with respect to the second high comb tooth region, so that the high-voltage coil 1320 can be arranged symmetrically in the axial direction of the high-voltage winding 130. In this case, the center of gravity of the high-voltage winding 130 is located at the center position of the high-voltage winding 130, making it convenient to lift and transport the high-voltage winding 130.Optionally, the first high comb tooth region, the first low comb tooth region, the second high comb tooth region, the second low comb tooth region, and the third high comb tooth region may not be arranged symmetrically, but this is not limited thereto. Optionally, the heights of the comb teeth in each region may be equal or other arrangement methods, but this is not limited thereto.

[0054] At least one segment of coil is provided between two adjacent comb teeth on the winding plate 1313, so that a conductor is wound in each winding groove 1314, and the high-voltage coil 1320 is rationally arranged so that the coils of each segment are spaced apart.

[0055] The winding plates 1313 are arranged at equal intervals on the outer circumferential surface of the support tube 1311 in the circumferential direction of the support tube 1311, both ends of each winding plate 1313 are flush with each other, the winding grooves 1314 on each winding plate 1313 coincide one-to-one in the circumferential direction of the support tube 1311, and the coils of each segment are wound by a conductor around the circumferential direction of the support tube 1311 in corresponding one turn of the winding grooves 1314 on all of the winding plates 1313, so that the applied force is uniform and the mechanical strength is good.

[0056] In another embodiment, in order to avoid the placement of the taps, the winding plates may be placed at unequal intervals on the outer circumferential surface of the support cylinder. That is, the distance between two adjacent winding plates is not equal to each other, and for example, the distance between two adjacent winding plates is greater than the distance between any other two adjacent winding plates. In this case, each tap can be pulled out from between the two adjacent winding plates that are spaced apart from each other by a larger distance, and thus the placement of each tap can be ensured without increasing the height of the comb teeth in the center of the winding plates.

[0057] In another embodiment, the winding plate may be an annular disk member provided to surround the support cylinder in the circumferential direction. A plurality of winding plates are arranged at intervals along the axial direction of the support cylinder, and the conductor is wound in grooves formed in two adjacent winding plates.

[0058] Alternatively, the support tube 1311 may be a hollow tube obtained by winding glass fiber impregnated with epoxy resin and hardening or pultrusion, or a hollow tube obtained by drawing glass fiber or aramid fiber impregnated with epoxy resin and winding it, or a hollow tube obtained by winding aramid fiber impregnated with epoxy resin and hardening or pultrusion, or may be manufactured using other composite materials, but is not limited thereto.

[0059] In one embodiment of the present invention, the support tube 1311 and the winding plate 1313 are two separate components that are fixed together by bonding. The winding plate 1313 is also made of glass fiber impregnated with epoxy resin, and is impregnated with epoxy resin into a multi-layer glass fiber cloth, which is then laminated to a certain thickness and pressed to harden to form a rectangular glass steel plate-like member. The glass steel plate-like member is provided with a winding groove 1314, specifically, the winding groove 1314 is formed by turning to form the winding plate 1313, and the winding plate 1313 is fixedly connected to the outer circumferential surface of the support tube 1311 by bonding, thereby maximally saving the manufacturing materials and reducing the cost. Optionally, the bonding agent is a two-component high-temperature resistant epoxy bonding agent, and of course, other bonding agents may also be used. However, the adhesive must ensure adhesion between the support tube 1311 and the winding plate 1313, and must also be resistant to high temperatures to accommodate the high-temperature injection of the high-voltage insulating layer 1330 on the outside of the winding body 1310.

[0060] In this embodiment, the winding plate 1313 is formed by pressing and hardening. In another embodiment, in order to simplify the process, the winding plate 1313 may be a comb-shaped winding plate that is integrally cast and hardened to be directly formed. The material of the winding plate is the same as that described above, and will not be described again.

[0061] In another embodiment of the present invention, the support tube 1311 is integrally molded with the winding plate 1313. After the epoxy resin-impregnated glass fiber or aramid fiber is drawn or wound into a thicker hollow tube, the hollow tube is turned to form the support tube 1311 and the winding plate 1313. In this way, although the amount of material used is relatively large, the strength between the support tube 1311 and the winding plate 1313 can be guaranteed, and the adhesion failure or damage to the connection between the support tube 1311 and the winding plate 1313 during the subsequent injection of the high-voltage insulating layer 1330 can be prevented.

[0062] 10 and 11, the winding body 1310 further includes two cover sheets 1315, which are provided at two ends of the support tube 1311, respectively, and extend outward along the radial direction of the support tube 1311 to form an annular disk surface. The cover sheets 1315 at both ends are provided opposite each other, and when the winding plate 1313 is disposed on the outer circumferential surface of the winding body 1310, the outer end surfaces of the two ends of the winding plate 1313 abut against the disk surfaces of the two cover sheets 1315 facing each other, thereby preventing the winding plate 1313 from being damaged by a larger injection pressure during the injection of the high-voltage insulating layer 1330. Of course, the outer end faces of the two ends of the winding plate 1313 may not abut against the opposing disk surfaces of the two face covers 1315, i.e., a gap may be left between the outer end faces of the two ends of the winding plate 1313 and the disk surface of the face cover 1315 facing the winding plate 1313, but this is not limited thereto. The face cover 1315 is manufactured from glass fiber impregnated with epoxy resin and is integrally molded with the support tube 1311, i.e., it is pultruded or wound from glass fiber or aramid fiber impregnated with epoxy resin, and then processed and polished into a disk member having a certain thickness.

[0063] Since the winding body 1310 is made of the above-mentioned fiber-reinforced composite material, it has the characteristics of being lightweight and high strength, has good mechanical strength, can effectively support the winding of the conductor wire, is not easily damaged, and can prevent the conductor wire from being scattered or displaced due to the injection impact force generated when the high-temperature vulcanized silicone rubber is injected onto the outside of the winding body 1310. In addition, since the fiber-reinforced composite material has good heat resistance, it can prevent the winding body 1310 from being deformed due to excessive heat generated by the high-voltage coil 1320 during operation of the dry-type transformer 10.

[0064] 10, 12 and 13 in combination, an example of an A-phase transformer 100 will be described. In one embodiment of the present invention, a conductor is wound around an outer circumferential surface of a winding body 1310 in a circumferential direction to form a high-voltage coil 1320. Specifically, the conductor is wound in the winding grooves 1314 of the winding section 1312 so as to be distributed at intervals in the axial direction of the support tube 1311 of the high-voltage coil 1320. After the winding of the conductor is completed, two external connection terminals, a first external connection terminal D and a second external connection terminal X, are formed at the front and rear ends, respectively, and the first external connection terminal D is connected to a cable and the second external connection terminal X is connected to another external connection line, for example, used for interconnection between transformers of each phase in a three-phase transformer. Six taps, namely tap 2, tap 3, tap 4, tap 5, tap 6, and tap 7, are drawn out from the axial center of the winding body 1310, and the six taps form a tap switch. For convenience of explanation, tap 2, tap 4, and tap 6 are defined as a first tap switch, and tap 3, tap 5, and tap 7 are defined as a second tap switch.

[0065] In one embodiment of the present invention, as shown in Figures 10, 12 and 15, the conductor includes a first conductor and a second conductor, both of which are continuous conductors, and both of the outside of the first conductor and the outside of the second conductor are covered with an insulating layer. The insulating layer may be a polyimide film or a glass fiber film, or the insulating layer may be other insulating materials such as polyester paint, or a combination of multiple types of insulating materials may be used, but is not limited thereto. The first conductor is wound from one end of the winding part 1312 along the axial direction of the support tube 1311 to the center of the winding part 1312, and three taps are drawn out. 12, for convenience of explanation, the upper end of the winding portion 1312 is defined as a first end, and the lower end of the winding portion 1312 is defined as a second end. The first conductor starts to be wound from the first end of the winding portion 1312 toward the second end of the winding portion 1312, and the first conductor is wound a predetermined number of turns in the first winding groove 1314 of all the winding plates 1313 to form the coil 1321 of the first segment, which is a disc-shaped coil. Only one disc-shaped coil is provided in each winding groove 1314, i.e., each coil of each segment has only one disc-shaped coil. The inner conductor end located at the first end of the winding portion 1312 of the first conductor forms a first external connection terminal D exposed to the outside of the high-voltage insulating layer 1330, that is, the first external connection terminal D is drawn out from the inner conductor end (i.e., the front end of the first conductor) of the coil 1321 of the first segment, and the outer conductor end of the coil 1321 of the first segment extends into the second winding groove 1314 of all the winding plates 1313 and continues to be wound to form the coil 1322 of the second segment. As described above, the first conductor is wound around the center of the winding body 1310, and the winding of the first conductor is completed until three taps, i.e., tap 6, tap 4, and tap 2 shown in FIG. 15, are drawn out from the outer conductor ends of the coils of three segments.

[0066] The second conductor is wound from the center of the winding section 1312 along the axial direction of the support tube 1311 to the second end of the winding section 1312, and another three taps are drawn out. Specifically, the second conductor starts to be wound in the next winding groove 1314 adjacent to tap 2 to form the third segment coil 1323. The second conductor continues to be wound toward the second end of the winding section 1312 by the same winding method as the first conductor, and another three taps, i.e. tap 3, tap 5, and tap 7, are drawn out from the three segment coils starting from the third segment coil 1323, and the second conductor is wound in the last winding groove 1314 of each winding plate 1313 at the second end of the winding section 1312 to form the final end segment coil 1324. The outer conductor end located at the second end of the winding portion 1312 of the second conductor forms a second external connection terminal X exposed outside the high-voltage insulating layer 1330, that is, the second external connection terminal X is drawn out from the outer conductor end of the coil 1324 of the final end segment (i.e., the rear end of the second conductor). This completes the winding of the second conductor.

[0067] When winding the conductor, the coils of each segment formed by winding the conductor are all wound into the winding grooves 1314 of all of the winding plates 1313 so that they are all perpendicular to the axial direction of the support tube 1311. This makes winding easy, the conductor is neatly arranged, the force applied to the winding plates 1313 and the support tube 1311 is uniform, and the mechanical strength is good.

[0068] In this way, a disk-shaped high voltage coil 1320 is formed. This coil structure has better mechanical strength, stronger ability to accept electric power caused by short circuit current, and better heat dissipation ability than a layered coil because the number of disk-shaped coils is larger. In addition, in the axial direction of the support tube 1311, as shown in Figures 13 and 15, taps 6, 4, and 2 are distributed in sequence to form a first tap switch, taps 3, 5, and 7 are distributed in sequence to form a second tap switch, and the first tap switch and the second tap switch are arranged in parallel, and the tap device of the high voltage coil 1320 is formed by six taps, so that the dry-type transformer 10 can adjust the voltage according to different operating conditions.

[0069] When the conducting wire is wound around winding body 1310 to form high-voltage coil 1320, high-voltage coil 1320 becomes annular, and if the width of the ring of high-voltage coil 1320 is defined as the width of high-voltage coil 1320, the widths of all high-voltage coils 1320 in their radial cross sections are the same, that is, the outer surface of high-voltage coil 1320 and the outer peripheral surface of support cylinder 1311 are equidistant, and the forces acting on high-voltage coil 1320 as a whole are balanced. Naturally, taking into consideration actual operation, the widths of the radial cross sections of each coil do not have to be exactly the same, as long as they are approximately the same.

[0070] In this embodiment, the second conductor is wound from the next winding groove 1314 adjacent to tap 2 to the last winding groove 1314 at the second end of the winding section 1312. In another embodiment, the second conductor may be wound upward from the last winding groove 1314 at the second end of the winding section to the next winding groove 1314 adjacent to tap 2. Here, the second external connection terminal X is formed first, and then taps 7, 5, and 3 are formed in this order. Of course, the winding method of the high-voltage coil 1320 is not limited to the above method, and a disc-shaped coil or a layered coil may be formed by other methods as long as the high-voltage winding 130 can be finally formed.

[0071] In this embodiment, the tap switch includes six taps. In this case, the dry-type transformer 10 has five levels of adjustable voltage. In another embodiment, the tap switch may include four taps, i.e., the first tap switch and the second tap switch each include two taps. In this case, the dry-type transformer has three levels of adjustable voltage. As long as it meets the actual usage requirements of the dry-type transformer, it is not limited here.

[0072] As shown in Figures 12 to 14, high-voltage insulating layer 1330 covers high-voltage coil 1320 and winding body 1310 to form high-voltage winding 130. High-voltage insulating layer 1330 is injection-molded silicone rubber, such as high-temperature vulcanized silicone rubber or liquid silicone rubber for injection. Injection-molded silicone rubber is molded by an injection process, which has a fast molding speed, high production efficiency, no cracks or air gaps, and Dry-type transformer 10 Since the partial discharge of the high-voltage winding 130 is small and the high-voltage winding 130 is made of silicone rubber, the connection parts between the high-voltage winding 130 and each component can achieve elastic vibration damping after assembly, and the noise during operation of the dry-type transformer 10 is greatly reduced. For example, the high-voltage insulating layer 1330 is made of high-voltage silicone rubber. First, a conductor is wound around the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 and the high-voltage coil 1320 are placed in a mold of an injector as the object to be injected, and silicone rubber raw material is added to inject the high-temperature vulcanized silicone rubber around the entire circumference of the object to be injected, thereby obtaining the high-voltage winding 130. The high-temperature vulcanized silicone rubber is used for the high-voltage insulating layer 1330, thereby improving the insulation performance and mechanical performance of the high-voltage winding 130 as a whole.

[0073] The high temperature vulcanization silicone rubber according to the embodiment of the present invention specifically adopts a high temperature vulcanization silicone rubber material system including raw rubber, reinforcing agent, flame retardant, heat resistance agent and other auxiliary materials.

[0074] After covering the high-voltage coil 1320 and the winding body 1310 with high-temperature vulcanized silicone rubber by one-piece vacuum injection, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the winding body 1310 and covers both ends of the winding body 1310, and the high-temperature vulcanized silicone rubber does not cover the inner wall of the support tube 1311, making the entire high-voltage winding 130 hollow columnar. Optionally, the high-voltage winding 130 may be a hollow cylinder, a hollow elliptical cylinder, or other hollow columnar body.

[0075] The tool connection member 101 is provided before the high-temperature vulcanized silicone rubber is integrally injected, and the six taps are connected to prevent the six taps from being covered with silicone rubber during injection and becoming unusable for wiring. As shown in FIG. 14, the tool connection member 101 is an aluminum alloy plate-shaped member, and a protective cavity is provided on the plate surface of the tool connection member 101, and the taps are fixedly connected in the protective cavity. In the present invention, the protective cavity is six identical stepped holes 1011, and the inner wall of the stepped holes 1011 is further provided with a screw thread. The six taps may be respectively connected to the six stepped holes 1011 by welding or may be fixedly connected by other methods, but this is not limited here. In addition, the six stepped holes 1011 in the tool connection member 101 are provided in two rows in parallel, and three stepped holes 1011 are provided in each row, and the first tap switch and the second tap switch are also arranged in parallel. At the same time, before the integral injection, the six taps are respectively connected to the six stepped holes 1011, and then bolts are connected to all of the six stepped holes 1011. In this way, the remaining space of the stepped holes 1011 can be directly filled with the bolts, which prevents the six stepped holes 1011 from being filled with silicone rubber, thereby avoiding the six taps being covered with silicone rubber and becoming unusable for wiring.

[0076] The two opposing side surfaces of the tool connection member 101 are further provided with two symmetrical connection grooves 1012, and the injection mold is correspondingly provided with two connection blocks. When the tool connection member 101 is placed in the injection mold, it is engaged and connected to the two connection blocks in the injection mold through the two connection grooves 1012 of the tool connection member, respectively, and the tool connection member 101 is fixed to the injection mold, which prevents the tool connection member 101 from being displaced due to a larger injection pressure during the injection of silicone rubber.

[0077] In another embodiment, the two opposite sides of the tool connection member may be provided with two symmetrical connection blocks, and the injection mold may be provided with two corresponding connection grooves. When the tool connection member is placed in the injection mold, it is engaged and connected to the two connection grooves in the injection mold through the two connection blocks of the tool connection member, respectively, and the tool connection member is fixed to the injection mold, which prevents the tool connection member from being displaced due to the larger injection pressure during the injection of the silicone rubber. After the high-voltage insulating layer 1330 is formed by integral injection, the side of the tool connection member 101 is covered with a small amount of silicone rubber, and the amount of silicone rubber covered on the tool connection member 101 is relatively small, so that the tool connection member 101 can be directly removed by a tool to expose the first tap switch and the second tap switch, and finally form the high-voltage winding 130 shown in FIG. 13.

[0078] In this embodiment, one tool connection member 101 is provided. In another embodiment, two tool connection members may be provided. In this case, the tool connection members may be smaller in size, each tool connection member may have three stepped holes, and six taps may be connected to the six stepped holes, but this is not limited thereto.

[0079] In this embodiment, as shown in Fig. 16, Fig. 16 shows a partial cross-sectional view along the axial direction of the high-voltage winding 130 covered with a high-voltage insulating layer 1330. The conductor wire is wound around a comb-teeth-shaped winding plate 1313 by the winding method in the above-mentioned embodiment to form a disk-shaped high-voltage coil 1320, and along the axial direction of the high-voltage winding 130, there is a gap between the disk-shaped high-voltage coil 1320 and the comb teeth of the winding plate 1313, i.e., one disk-shaped coil is provided between two adjacent comb teeth.

[0080] In another embodiment, as shown in FIG. 17, FIG. 17 is a partial cross-sectional view along the axial direction of the high-voltage winding 230 covered with a high-voltage insulating layer 2330. The conductor wire is wound around the comb-tooth winding plate 2313 by a double-winding continuous winding method to form the high-voltage coil 2320. After two identical continuous conductor wires are arranged adjacent to each other, they are simultaneously wound from within the winding grooves 2314 corresponding to the upper ends of all the winding plates 2313 to form the first segment coil 2321, which includes two disk-shaped coils arranged closely along the axial direction of the support tube 2311, and the specific winding method is consistent with the high-voltage coil 1320 in the above-mentioned embodiment. The winding continues downward in the same manner to form other coils, such as the second segment coil 2322, until the high-voltage coils 2320 spaced apart along the axial direction of the high-voltage winding 230 are formed. Each coil of each segment includes two disc-shaped coils arranged close to each other, and the length of each coil of each segment along the axial direction of the winding plate 2313 is equal to the sum of the widths of the two parallel conductors along the axial direction of the support tube 2311, that is, two disc-shaped coils are provided between two adjacent comb teeth on the winding plate 2313. In the present invention, the two same conductors refer to the two conductors having the same size and material. Compared with the continuous winding structure of a single conductor (i.e., the structure of the high-voltage coil 1320 described above), in the case of a high-voltage winding of the same size standard, the number of winding grooves 2314 can be reduced, and the transition parts of the conductor between the gaps of the coils of each segment can be reduced, thereby reducing the amount of conductor used and achieving the purpose of lowering the cost. In another embodiment, three or more disc-shaped coils may be provided between two adjacent comb teeth on the winding plate.

[0081] In another embodiment, as shown in FIG. 18, FIG. 18 shows a partial cross-sectional view along the axial direction of a high-voltage winding 330 covered with a high-voltage insulating layer 3330. The width of the winding groove 3314 in the winding plate 3313 along the axial direction of the support tube 3311 is larger than the width of the winding groove 2314 in the winding plate 2313 along the axial direction of the support tube 2311. The conductor wire is first formed into the coil 3321 of the first segment by a layer winding method. Specifically, using one continuous conductor wire, in the first winding groove 3314 of one turn corresponding to the upper end of all the winding plates 3313, continuous winding is performed downward at the upper end of the first winding groove 3314 along the axial direction of the support tube 3311, forming a first layer coil until the conductor wire is wound at the lower end of the first winding groove 3314, and the conductor wire of the coil of the first layer has a spiral shape densely arranged on the outer circumferential surface of the support tube 3311. After completing the winding of the coil of the first layer, the conductor is wound in the opposite direction from the lower end of the first winding groove 3314 upward along the axial direction of the support tube 3311 to form the coil of the second layer. The conductor is wound back and forth in the same manner in sequence until the coil 3321 of the first segment reaches a predetermined width in the radial direction of the support tube 3311 of the high-voltage coil 3320, and finally the coil 3321 of the first segment has a spiral shape densely arranged on the outer circumferential surface of the support tube 3311. Then, the conductor passes through the comb teeth of the winding plate 3313 and transitions into the second winding groove 3314, and is wound according to a layer winding method to form the coil 3322 of the second segment. The conductor is wound in the same manner in sequence until the winding of the conductor in all the winding grooves 3314 is completed, thereby finally forming the high-voltage coil 3320.

[0082] The width of the winding grooves 3314 in the axial direction of the support cylinder 3311 is larger, the coils of each segment are arranged in a spiral shape in the axial direction of the winding plate 3313, and the length of the coils of each segment in the axial direction of the winding plate 3313 is larger than the sum of the widths of the two parallel conductors, thereby forming a multi-segment cylindrical high-voltage coil 3320. Compared with a disk-shaped structure wound by the double winding continuous winding method (i.e., the structure of the high-voltage coil 2320 in the above-mentioned embodiment), for a high-voltage winding of the same specification, the high-voltage coil 3320 is more compact and has fewer winding grooves 3314, thereby reducing the amount of conductor wire used and achieving the purpose of further reducing costs.

[0083] In this embodiment, a winding plate 3313 is provided to interpose comb teeth between the coil 3321 of the first segment and the coil 3322 of the second segment. In another embodiment, a gap may be provided between the coil of the first segment and the coil of the second segment without providing a winding plate, and the high-voltage coil is finally fixed by filling a high-voltage insulating layer, similarly achieving the purpose of insulation between the high-voltage coil segments.

[0084] In another embodiment, as shown in FIG. 19, FIG. 19 shows a partial cross-sectional view along the axial direction of the high-voltage winding 430 covered with the high-voltage insulating layer 4330. The method of forming the high-voltage coil 4320 is the same as that of the high-voltage coil 3320 in the above-mentioned embodiment, and will not be described again. However, the length along the axial direction of the coil support tube 4311 of each segment of the high-voltage coil 4320 is greater than the length along the axial direction of the coil support tube 3311 of each segment of the high-voltage coil 3320, so that for a dry-type transformer 10 of the same voltage level, the number of segments of the segmented cylindrical high-voltage coil 4320 is smaller. Since the length along the axial direction of the coil support tube 4311 of each segment of the high-voltage coil 4320 is greater, the voltage difference between the coils of each segment is larger, so that an insulating layer needs to be added between the coil layers of each segment to reduce the voltage difference. In this case, the coil of each segment is provided with an interlayer insulating layer 4301 in the axial direction of the high-voltage winding 430, thereby preventing the interlayer electric field strength from exceeding the tolerable limit value at which the insulated conductor is covered with an insulating film. The layered structure of the coil of each segment also has good lightning resistance and is more economically advantageous. Specifically, when the conductor is wound to a certain thickness by the layer winding method, the interlayer insulating layer 4301 is disposed at the corresponding position, and then the conductor is continued to be wound again to provide the interlayer insulating layer 4301 in the coil of each segment.

[0085] The interlayer insulating layer 4301 may be a mesh cloth, an insulating support strip spaced apart in the circumferential direction, or other hard insulating material. The insulating support strip is an insulating long strip with corrugated edges, which can prevent the insulating support strip from being damaged by a very high injection pressure when high-temperature vulcanized silicone rubber is injected to form the high-voltage insulating layer. The insulating support strip is made of a hard insulating material, so that it can resist the impact force during high-temperature injection of silicone rubber. At the same time, the interlayer insulating layer 4301 may be provided in one layer, two layers, or three layers, which is determined according to different design situations, but is not limited here.

[0086] 20-21, in one embodiment of the present invention, a winding body 5310 has a structure similar to that of the winding body 1310 in the above-described embodiment, but differs in that a support tube 5311 and a winding portion 5312 are engaged and connected. Specifically, the winding body 5310 further includes an auxiliary member 5316, which is located at the center of the outer circumferential surface of the support tube 5311 and extends outward along the radial direction of the support tube 5311, so that the auxiliary member 5316 surrounds the support tube 5311 to have an annular disk surface. A locking groove is provided in the winding plate 5313 or the auxiliary member 5316, and the winding plate 5313 is engaged and connected to the auxiliary member 5316 by the locking groove. In this embodiment, each winding plate 5313 is provided with a first locking groove 53131, and the first locking groove 53131 is provided to correspond to the position of the auxiliary member 5316 so that the auxiliary member 5316 is engaged within each first locking groove 53131.

[0087] The longer side edge of the winding plate 5313 is provided along the axial direction of the support tube 5311, and the plurality of winding grooves 5314 are provided along the radial direction of the support tube 5311 and are distributed at intervals along the axial direction of the support tube 5311 to form a plurality of comb teeth on the winding plate 5313. The first locking groove 53131 is located on the winding plate 5313 and is provided opposite to the winding groove 5314, i.e., the first locking groove 53131 is provided along the radial direction of the support tube 5311 and is located on the side of the winding plate 5313 close to the support tube 5311, so that the auxiliary member 5316 protruding from the outer circumferential surface of the support tube 5311 can be engaged in the first locking groove 53131. The auxiliary member 5316 can maintain a stable position of the winding plate 5313, and can prevent the winding plate 5313 from moving or shifting during winding of the conductor wire and injection of the high voltage insulating layer.

[0088] The first locking groove 53131 is located at the middle of the winding plate 5313, and in the radial direction of the support tube 5311, the first locking groove 53131 extends from a side edge of the winding plate 5313 close to the support tube 5311 to one comb tooth at the middle of the winding plate 5313, or the first locking groove 53131 and one comb tooth at the middle of the winding plate 5313 are provided flush with each other but do not extend to the comb tooth. On the other hand, by providing the first locking groove 53131 and the winding groove 5314 flush with each other, it is possible to prevent the mechanical strength of the winding plate 5313 from being adversely affected and further the winding plate 5313 from being broken by force. On the other hand, since the height of the teeth of the comb teeth at the middle position of the winding plate 5313 is larger, it is possible to further reduce the influence of the first locking groove 53131 on the mechanical strength of the winding plate 5313. At the same time, the groove depth of the first locking groove 53131 in the radial direction of the support tube 5311 is consistent with the width of the auxiliary member 5316 protruding from the support tube 5311, so that after the auxiliary member 5316 and the winding plate 5313 are assembled, the outer surface of the auxiliary member 5316 is in close contact with the inner surface of the first locking groove 53131, improving the mechanical strength and making the fastening reliable. If the groove depth of the first locking groove 53131 is smaller than the width of the auxiliary member 5316 protruding from the support tube 5311, a gap will remain between the winding plate 5313 and the support tube 5311, and there is a risk that the winding plate 5313 will be bent around the auxiliary member 5316 during winding of the conductor and during injection of the high-voltage insulation layer. If the groove depth of the first locking groove 53131 is larger than the width of the auxiliary member 5316 protruding from the support tube 5311, a gap will remain between the first locking groove 53131 and the auxiliary member 5316, and the auxiliary member 5316 will not be able to perform its fastening function.

[0089] The auxiliary member 5316 is made of glass fiber impregnated with epoxy resin. First, a ring member having a certain thickness is formed by press molding, and then the auxiliary member 5316 is fixedly connected to the outer circumferential surface of the support tube 5311 by adhesive, thereby maximizing the amount of material used and saving costs. Of course, the auxiliary member may be integrally molded with the support tube. That is, a hollow tube with a larger thickness is first manufactured, and then the winding plate 5313 and the auxiliary member 5316 are simultaneously formed by lathing.

[0090] In this embodiment, one auxiliary member 5316 and one set of first locking grooves 53131 are provided. In other embodiments, a plurality of auxiliary members, such as two or three, may be provided. Accordingly, a plurality of sets of first locking grooves, such as two or three sets, may be provided at intervals along the axial direction of the support tube. In such an embodiment, the auxiliary members and the first locking grooves of each set are distributed at intervals along the axial direction of the support tube, effectively equalizing the strength of the winding plate and making the structure of the winding plate more stable. For example, in one embodiment, one auxiliary member is provided at the center and both ends of the outer circumferential surface of the support tube, and three first locking grooves are provided corresponding to each winding plate.

[0091] In one embodiment according to the present invention, as shown in Figs. 22-23, the difference from the support tube 5311 in the above-mentioned embodiment is that the auxiliary member 6316 on the outer circumferential surface of the support tube 6311 is provided with a plurality of second locking grooves 63161, and the plurality of second locking grooves 63161 are arranged at equal intervals in the circumferential direction of the auxiliary member 6316, that is, each second locking groove 63161 corresponds to one winding plate. In such an embodiment, there is no need to provide a locking groove in the winding plate, and the winding plate is directly engaged in the second locking groove 63161. On the one hand, it is possible to maintain a stable arrangement of the winding plate and to prevent the winding plate from moving or shifting during winding of the conductor and injection of the high-voltage insulating layer, and on the other hand, it is possible to avoid affecting the mechanical strength of the winding plate by providing the locking groove in the winding plate. The material and the molding method of the auxiliary member 6316 are the same as those of the auxiliary member 5316 in the above-mentioned embodiment, so they will not be described again here.

[0092] In another embodiment, as shown in Figures 24-25, the winding body may only include a winding portion 7310. That is, the winding body is not provided with a support tube. By omitting the structure of the rigid insulating liner tube, the heat conduction effect of the high voltage winding is better, and there is no interface between the high voltage insulating layer and the rigid insulating liner tube, thereby suppressing the surface discharge of the rigid insulating liner tube, saving materials and reducing costs.

[0093] Specifically, the winding section 7310 includes a plurality of comb-tooth-shaped winding plates 7311 and a plurality of auxiliary members 7312. The plurality of auxiliary members 7312 are annular and are provided at intervals along the axial direction of the auxiliary members 7312. The winding plate 7311 is fixed to the outer periphery of the plurality of auxiliary members 7312 along the axial direction of the auxiliary members 7312, and each winding plate 7311 is connected to all the auxiliary members 7312 simultaneously. The plurality of winding plates 7311 are arranged at equal intervals along the circumferential direction of the auxiliary members 7312. The axial direction of the auxiliary members 7312 is the axial direction of the winding section 7310, i.e., the axial direction of the high-voltage winding. The shape of the auxiliary members 7312 can be designed to be circular, elliptical, or the like, depending on the overall shape of the high-voltage winding. A plurality of winding plates 7311 are provided along the circumferential direction of the auxiliary member 7312, a conductor is wound around the winding portion 7310 to form a high-voltage coil, the high-voltage coil includes a multi-segment coil, the multi-segment coil is spaced apart along the axial direction of the high-voltage winding, and a high-voltage insulating layer covers the high-voltage coil, the plurality of auxiliary members 7312, and the winding plate 7311. The auxiliary member 7312 can maintain a stable position of the winding plate 7311, and can prevent the winding plate 7311 from moving or shifting during the winding of the conductor and the injection of the high-voltage insulating layer.

[0094] In one embodiment, a plurality of third locking grooves 73121 are provided on the outer surface of the auxiliary member 7312, and the plurality of third locking grooves 73121 are provided at equal intervals along the circumferential direction of the auxiliary member 7312. The third locking grooves 73121 of the plurality of auxiliary members 7312 are flush with each other in the axial direction of the auxiliary member 7312 to form a plurality of third locking groove arrays, and the number of the third locking groove arrays corresponds to the number of the winding plates 7311. Each of the winding plates 7311 is engaged with a corresponding one of the third locking groove arrays such that the winding plates 7311 are arranged at equal intervals around the outer periphery of the plurality of auxiliary members 7312 in the circumferential direction. Furthermore, both ends of all winding plates 7311 are flush with each other, and the third engagement grooves 73121 of all auxiliary members 7312 are flush with each other in the axial direction of the auxiliary members 7312, so that each winding plate 7311 is arranged along the axial direction of the auxiliary members 7312, and the conductor is wound within the comb teeth of the winding plate 7311 to form a high-voltage coil, that is, the multiple coil segments of the high-voltage coil are distributed at intervals in the axial direction of the winding portion 7310, the applied force is uniform, and the mechanical strength is improved.

[0095] If the width of the third locking groove 73121 along the circumferential direction of the auxiliary member 7312 is defined as the groove width of the third locking groove 73121, the groove width of the third locking groove 73121 is equal to the thickness of the winding plate 7311, thereby ensuring the assembly of the winding plate 7311 and the auxiliary member 7312, and preventing the winding plate 7311 from being difficult to be fixed flush with the auxiliary member 7312 when the groove width of the third locking groove 73121 is smaller than the thickness of the winding plate 7311, or preventing the winding plate 7311 from being detached from the outside of the auxiliary member 7312 when the groove width of the third locking groove 73121 is larger than the thickness of the winding plate 7311. The winding plate 7311 is fixedly connected in the third locking groove 73121 by an adhesive, which is a two-component high-temperature resistant epoxy adhesive, and may of course be other adhesives. However, the adhesive must ensure adhesion between the winding plate 7311 and the auxiliary member 7312, and must also be resistant to high temperatures so that the high-voltage insulating layer can be coated on the winding plate 7311 and the auxiliary member 7312 by a high-temperature injection method.

[0096] In another embodiment, a locking groove may be provided on the side of the winding plate close to the auxiliary member, and the auxiliary member may be engaged in the locking groove of the winding plate to fixedly connect the winding plate to the auxiliary member. Of course, preferably, in the above-mentioned embodiment, the auxiliary member 7312 is provided with the third locking groove 73121, so as to avoid a decrease in the mechanical strength of the winding plate due to the locking groove being provided on the winding plate.

[0097] 24, winding plate 7311 is a comb-tooth plate 7311 that is similar in structure to winding plate 1313 in the above-described embodiment, but differs in that both ends of comb-tooth plate 7311 are provided with flow grooves 73111. This allows the injected silicone rubber material to flow into the inside of winding portion 7310 from the ends of winding portion 7310 during injection molding of the high-voltage insulation layer, and further allows the high-voltage insulation layer to sufficiently fill the gap between winding portion 7310 and the high-voltage coil and both ends of winding portion 7310.

[0098] The winding plate 7311 and the auxiliary member 7312 are both made of glass fiber impregnated with epoxy resin, and are laminated to a certain thickness after being impregnated with epoxy resin into a multi-layer glass fiber cloth, and then pressed and hardened to form a glass steel member. In this embodiment, the winding plate 7311 and the auxiliary member 7312 are molded separately and then fixed by bonding. In other embodiments, the winding plate and the auxiliary member may be molded integrally.

[0099] In another embodiment, referring to Figs. 26-27, high-voltage winding 830 includes a winding portion 8312, a high-voltage coil 8320, and a high-voltage insulating layer 8330. Winding portion 8312 is provided in the circumferential direction inside high-voltage winding 830, and a conductor is wound outside winding portion 8312 to form high-voltage coil 8320. High-voltage insulating layer 8330 covers high-voltage coil 8320 and winding portion 8312. Compared with high-voltage winding 130 in the above-described embodiment, high-voltage winding 830 includes only winding portion 8312 as a winding body, and does not include a rigid insulating liner tube, i.e., a support tube. By omitting the structure of the rigid insulating liner tube, on the one hand, the thermal conduction effect of the high-voltage winding 830 is better, and there is no interface between the high-voltage insulating layer 8330 and the rigid insulating liner tube, thereby suppressing the surface discharge of the rigid insulating liner tube; on the other hand, it further saves materials and reduces costs.

[0100] The winding section 8312 includes a plurality of comb-tooth-shaped winding plates 8313, which are spaced apart and equally spaced apart in the circumferential direction inside the high-voltage winding 830, and each winding plate 8313 is provided along the axial direction of the high-voltage winding 830. The high-voltage coil 8320 includes a coil of multiple segments, and at least one coil segment is provided between two adjacent comb teeth on the winding plate 8313. The number of the winding plates 8313 is at least two. Optionally, the number of the winding plates 8313 may be two, three, four or more, but is not limited thereto.

[0101] The winding plate 8313 is further provided with a plurality of winding grooves 8314, so that the winding plate 8313 has a comb-like shape, that is, a plurality of comb teeth are formed on the winding plate 8313. The specific structure, material, forming method, etc. of the winding plate 8313 are the same as those of the winding plate 1313 described above, and therefore will not be described here repeatedly.

[0102] 28 to 31, high-voltage winding 930 is basically the same as high-voltage winding 830 described above, but differs in that winding section 9312 further includes auxiliary member 9316, which is annular, coaxial with high-voltage winding 930, and fitted onto and fixed to a plurality of winding plates 9313. The arrangement of auxiliary member 9316 makes it possible to maintain a stable arrangement of winding plate 9313, and to prevent movement or deviation of winding plate 9313 during winding of the conductor wire and injection of the high-voltage insulating layer.

[0103] Specifically, the auxiliary member 9316 includes at least one end auxiliary member 93161, which is provided on the outer side of the end of the winding plate 9313. This allows the winding plate 9313 to be stably positioned without affecting the winding of the conductor wire. Referring to FIG. 29, a groove 9317 is provided on the outer side of the end of the winding plate 9313, and the end auxiliary member 93161 is fitted into the groove 9317, thereby ensuring an effective connection between the end auxiliary member 93161 and the winding plate 9313. The groove 9317 is located on the comb tooth side of the winding plate 9313, i.e., on the side of the winding plate 9313 away from the axis of the high-voltage winding 930, which improves the role of fixing the end auxiliary member 93161 to the winding plate 9313, and prevents the winding plate 9313 from moving or shifting during winding of the conductor wire and injection of the high-voltage insulating layer. The depth of the groove 9317 is equal to or greater than the thickness of the end auxiliary member 93161, so that the silicone rubber material can easily cover the end of the winding plate 9313 and the end auxiliary member 93161 during injection, and the connection between the winding plate 9313 and the end auxiliary member 93161 is less likely to be lost due to the influence of external forces. The end auxiliary member 9316 is fixedly connected in the groove 9317 by an adhesive, which is a two-component high-temperature resistant epoxy adhesive, and of course, can be other adhesives. However, the adhesive must ensure the adhesion between the end auxiliary member 9316 and the winding plate 9313, and must also be high-temperature resistant to accommodate the high-voltage insulating layer being coated on the outer periphery of the winding plate 9313 and the end auxiliary member 93161 by the high-temperature injection method. In another embodiment, the end auxiliary member may be completely consistent with the size of the groove. Thus, the end auxiliary member is fitted and fixed in the groove without adhesive.

[0104] In this embodiment, an end auxiliary member 93161 is provided on the outside of each of the two ends of the winding plate 9313. As a result, both ends of the winding plate 9313 are fixed by the auxiliary member 9316, and the stable arrangement of the winding plate 9313 can be effectively maintained. In other embodiments, an end auxiliary member may be provided on the outside of only one end of the winding plate.

[0105] 28 and 30 in combination, the auxiliary member 9316 further includes an intermediate auxiliary member 93162, and when the winding plate 9313 is surrounded by the hollow cavity, if one side for forming the inner wall of the hollow cavity is defined as the inner wall of the winding plate 9313, the intermediate auxiliary member 93162 is provided on the inner wall of the winding plate 9313 and does not affect the winding of the conductor on the comb tooth side of the winding plate 9313. Referring to FIG. 30, a fourth locking groove 93131 is provided on the inner wall of the winding plate 9313, and the intermediate auxiliary member 93162 is fitted into the fourth locking groove 93131, thereby ensuring an effective connection between the intermediate auxiliary member 93162 and the winding plate 9313. The groove depth of the fourth locking groove 93131 matches the ring width of the intermediate auxiliary member 93162, so that after the intermediate auxiliary member 93162 and the winding plate 9313 are assembled, the inner wall of the intermediate auxiliary member 93162 and the inner wall of the winding plate 9313 are flush with each other; if the groove depth of the fourth locking groove 93131 is smaller than the ring width of the intermediate auxiliary member 93162, it is possible to avoid the winding plate 9313 being bent around the intermediate auxiliary member 93162 during winding of the conductor and injection of the high-voltage insulation layer; or if the groove depth of the fourth locking groove 93131 is larger than the ring width of the intermediate auxiliary member 93162, it is possible to avoid the intermediate auxiliary member 93162 being unable to perform its fastening function.

[0106] In this embodiment, the auxiliary member 9316 includes two end auxiliary members 93161 and one middle auxiliary member 93162. This allows the winding plate 9313 to maintain a stable position during winding of the conductor wire and injection of the high-voltage insulation layer, and prevents movement or displacement, which can prevent the coils of the two segments from being too close to each other, resulting in insufficient insulation distance and discharge. In other embodiments, only end auxiliary members may be provided, only middle auxiliary members may be provided, or multiple auxiliary members may be provided at intervals along the axial direction of the high-voltage winding, as long as they can play a role in reinforcing the winding plate.

[0107] The auxiliary member 9316 is also made of glass fiber impregnated with epoxy resin, and is impregnated with epoxy resin into a multi-layer glass fiber cloth, and then laminated to a certain thickness, pressed, and hardened to form an annular glass steel plate-like member. The auxiliary member 9316 may be annular, elliptical, or other annular member. The thickness of the end auxiliary member 93161 must be smaller than the height of the teeth at both ends of the winding plate 9313, and the width of the ring of the intermediate auxiliary member 93162 must be smaller than the width of the non-comb tooth portion of the winding plate 9313, that is, the width obtained by subtracting the width of the winding groove 9314 from the total width of the winding plate 9313, or the thickness of the intermediate auxiliary member 93162 must be smaller than the height of the teeth of the comb tooth at the center of the winding plate 9313, if there is no requirement on the width of the ring. In this manner, the auxiliary member 9316 is prevented from occupying the winding groove 9314 and affecting the winding of the conductor around the winding plate 9313 .

[0108] Alternatively, the auxiliary member 9316 and the winding plate 9313 are molded separately and then fixedly attached to each other, or the auxiliary member 9316 and the winding plate 9313 are molded integrally.

[0109] The conductive wire is wound in the circumferential direction around the outer periphery of winding plate 9313 to form a high-voltage coil. Next, high-temperature vulcanized silicone rubber is coated on winding portion 9312, the high-voltage coil, and auxiliary member 9316 by integral vacuum injection to form high-voltage winding 930.

[0110] The beneficial effects of the present invention include at least the following: The high voltage winding of the dry-type transformer of the present invention comprises a winding body, a high voltage coil, and a high voltage insulating layer of injection-molded silicone rubber, and compared with the epoxy resin high voltage insulating layer of the prior art, it has the following advantages: 1) It has better fire protection performance, low temperature resistance performance, aging resistance performance and short circuit test ability, and can effectively extend the service life of the dry-type transformer. 2) The copper coil is easy to peel off from the silicone rubber, and the material recycling rate is greater than 99%, which is more environmentally friendly. 3) On the one hand, the silicone rubber elastomer can reduce the induction of partial discharge caused by mechanical vibration, and has the effect of inhibiting the discharge of the device, and since the product of the discharge action of the silicone rubber is non-conductive silicon dioxide, it can effectively inhibit the continuous deterioration of the insulation; on the other hand, after assembly, each part can realize the vibration damping connection by the silicone rubber elastomer, and the vibration and noise can be greatly reduced. 4) It can reduce the operating loss of the transformer, and is more energy-saving. 5) Silicone rubber has water repellency and water repellency mobility, good resistance to electrolytic corrosion and flame retardancy, and is an insulating material of class H, with good insulating properties, so it has good resistance to harsh environments and can be installed indoors and outdoors. At the same time, the silicone rubber of the present invention is integrally molded by high-temperature vulcanization injection, and this process method makes the high-voltage insulating layer more stable, has higher mechanical performance, and has better adhesion to the high-voltage coil and winding body, so that the service life of the high-voltage insulating layer can be effectively extended. In addition, the injection silicone rubber filler of the present invention is uniformly dispersed, so that partial discharge of the dry-type transformer caused by the agglomeration of the filler does not occur, and the overall performance of the dry-type transformer is better.

[0111] Although the technical contents and technical features of the present application have been disclosed as above, those skilled in the art may, under the creative concept of the present invention, make various modifications and improvements to the above structures and materials, including combinations of the technical features individually disclosed or claimed herein, and obviously other combinations of these features. All of these modifications and / or combinations are within the technical field of the present application and the scope of the feature claims of the present application.

Claims

1. A winding body used in a high voltage winding, a plurality of winding plates, each of which is provided with a plurality of winding grooves so as to form a plurality of comb teeth in the winding plate; at least one auxiliary member, the auxiliary member being annular, the winding plate being provided along a circumferential direction of the auxiliary member, and the auxiliary member being fixedly connected to the winding plate; A locking groove is provided in the plurality of winding plates or the auxiliary member, and the winding plates and the auxiliary member are engaged and connected by the locking groove, The auxiliary members include an intermediate auxiliary member provided on an inner wall of the winding plate, and an end auxiliary member provided on the outer side of an end of the winding plate. A winding body characterized by:

2. If the height of the comb teeth along the longitudinal direction of the winding plate is defined as the tooth height, the tooth height of the comb teeth in the central portion of the winding plate and the tooth height of the comb teeth at both ends of the winding plate are both greater than the tooth height of the comb teeth in other portions of the winding plate. The winding body according to claim 1 .

3. The rotor further includes a support cylinder which is a hollow column, and the winding plates are evenly arranged on the outer circumferential surface of the support cylinder in the circumferential direction, and the longitudinal direction of each of the winding plates is aligned along the axial direction of the support cylinder. The winding body according to claim 1 .

4. A first high comb tooth region, a first low comb tooth region, a second high comb tooth region, a second low comb tooth region, and a third high comb tooth region are formed in this order from one end to the other end along the longitudinal direction of the winding plate, the first high comb tooth region and the third high comb tooth region being disposed symmetrically with respect to the second high comb tooth region, and the first low comb tooth region and the second low comb tooth region being disposed symmetrically with respect to the second high comb tooth region. The winding body according to claim 2 .

5. The auxiliary member is located on the outer circumferential surface of the support tube, and extends outward along the radial direction of the support tube, surrounding the support tube to form an annular shape. The winding body according to claim 3 .

6. The winding body is made of a fiber-reinforced composite material. The winding body according to claim 1 .

7. A plurality of the auxiliary members are provided, and the auxiliary members are provided at intervals in the axial direction of the auxiliary members. The winding body according to claim 1 .

8. A winding body according to any one of claims 1 to 7, a high-voltage coil, and a high-voltage insulating layer, A conductor is wound around the winding body to form the high voltage coil, and the entire outside of the high voltage coil is covered with the high voltage insulating layer. A high voltage winding.

9. The conductor includes a first conductor and a second conductor, the first conductor being wound from one end of the winding body to a center portion of the winding body along the longitudinal direction of the winding plate, and the second conductor being wound from the center portion of the winding body to the other end of the winding body along the longitudinal direction of the winding plate.

9. A high voltage winding as claimed in claim 8.

10. The high-voltage insulating layer fills the gap between the high-voltage coil and the winding body and covers both ends of the winding body, and the high-voltage insulating layer is made of injection molded silicone rubber.

9. A high voltage winding as claimed in claim 8.

11. The injection molded silicone rubber is a high temperature vulcanized silicone rubber or a liquid silicone rubber for injection.

11. High voltage winding according to claim 10.

12. The high-voltage coil includes a multi-segment coil, the conductor is wound in the winding groove such that the multi-segment coil is spaced apart along the axial direction of the high-voltage winding, and at least one segment of the coil is provided between two adjacent comb teeth on the winding plate.

9. A high voltage winding as claimed in claim 8.

13. The coils of each section are wound back and forth in layers along the axial direction of the high-voltage winding, and are densely arranged on the outer circumferential surface of the winding body.

13. A high voltage winding as claimed in claim 12.

14. A rotor comprising an iron core, a low-voltage winding, and the high-voltage winding according to claim 8, wherein the low-voltage winding is fitted around the iron core, and the high-voltage winding is fitted around the low-voltage winding. A dry-type transformer characterized by:

15. Four core clamps are provided on the outside of the iron core, and the core clamps are made of fiber-reinforced composite material.

15. A dry-type transformer according to claim 14.

16. The core clamp is pressed or pultruded from a fiber material impregnated with epoxy resin.

16. A dry-type transformer according to claim 15.

17. The low-voltage winding includes copper foil and a low-voltage insulating layer, the copper foil and the low-voltage insulating layer being alternately provided, The low voltage insulating layer is SHS-P diphenyl ether prepreg or silicone rubber film 15. A dry-type transformer according to claim 14.

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