WO2024066824A1

WO2024066824A1 - Preparation method for high-voltage winding, and high-voltage winding

Info

Publication number: WO2024066824A1
Application number: PCT/CN2023/114604
Authority: WO
Inventors: 马斌; 马婷婷; 张鑫鑫; 刘超; 姜建飞; 董积信; 刘俊
Original assignee: 江苏神马电力股份有限公司
Priority date: 2022-09-29
Filing date: 2023-08-24
Publication date: 2024-04-04
Also published as: CN115512960A

Abstract

A high-voltage winding (130) and a preparation method therefor. The preparation method for the high-voltage winding (130) comprises the following steps: circumferentially winding a wire along the outer peripheral surface of a wire winding body (1310) to form a high voltage coil (1320), and forming taps (2, 3, 4, 5, 6, 7) in the wire winding process; placing the taps (2, 3, 4, 5, 6, 7) in a protective cavity of a tooling connecting member (101), and connecting and fixing the taps (2, 3, 4, 5, 6, 7) to the tooling connecting member (101) to obtain a body to be injected; placing said body into a mold (102) of an injection machine, such that the outer peripheral surface of the high voltage coil (1320) abuts against at least one support auxiliary member (1340) provided on the inner wall of the mold (102); perform injection on the periphery of said body to form high-temperature vulcanized silicone rubber, so as to obtain a high-voltage winding preform provided with a groove (1341) on the surface; filling the groove (1341) of the high-voltage winding preform, so that the high-temperature vulcanized silicone rubber is continuous at the groove (1341); and removing the tooling connecting member (101) to obtain a high-voltage winding (130) of which the taps (2, 3, 4, 5, 6, 7) are exposed to the high-temperature vulcanized silicone rubber. By providing the support auxiliary member (1340), the wire displacement is effectively prevented.

Description

A method for preparing a high voltage winding and a high voltage winding

Technical Field

The present application relates to the technical field of power transformers, and in particular to a method for preparing a high-voltage winding and a high-voltage winding.

Background technique

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

Summary of the invention

In view of the deficiencies in the prior art, the purpose of the present application is to provide a method for preparing a high-voltage winding, which can be used to prepare the high-voltage winding of the present application and can solve the problem of wire displacement during the injection process to avoid affecting product quality.

To achieve the above-mentioned purpose, the technical solution adopted in the present application is: a method for preparing a high-voltage winding, comprising the following steps: a wire is circumferentially wound along the outer circumferential surface of a winding body to form a high-voltage coil, and a tap is formed during the winding process of the wire; the tap is placed in a protective cavity of a tooling connector and fixedly connected to the tooling connector to obtain a body to be injected; the body to be injected is placed in a mold of an injection molding machine so that the outer circumferential surface of the high-voltage coil abuts against at least one supporting auxiliary part provided on the inner wall of the mold; high-temperature vulcanized silicone rubber is formed by injection molding around the body to be injected to obtain a high-voltage winding preform with grooves on the surface; the grooves of the high-voltage winding preform are filled so that the high-temperature vulcanized silicone rubber is continuous at the grooves; the tooling connector is removed to obtain a high-voltage winding with the tap exposed outside the high-temperature vulcanized silicone rubber.

This method can prepare the high-voltage winding of the present application. The high-temperature vulcanized silicone rubber injection process makes the high-voltage insulation layer more stable, has higher mechanical properties and longer service life. The provision of supporting auxiliary parts can prevent the conductor from being displaced during the injection process, thereby effectively improving the quality stability of the product.

The wire is wound circumferentially along the outer circumference of the winding body to form a high-voltage coil. Before the tap is formed during the wire winding process, the process includes: arranging flanges at both ends of the winding body, and in the radial direction of the winding body, the width of the flange is equal to or slightly smaller than the width of the high-voltage coil to ensure that the supporting auxiliary parts can be installed. Smoothly abut the outer peripheral surface of the high-voltage coil.

Among them, placing the body to be injected into the mold of the injection machine so that the outer peripheral surface of the high-voltage coil abuts against at least one supporting auxiliary part provided on the inner wall of the mold includes: detachably fixing the supporting auxiliary part to the inner wall of the mold along the axial direction of the mold. The detachable connection between the supporting auxiliary part and the mold allows the mold to be used for the preparation of high-voltage windings without supporting auxiliary parts, which has a wider application range and effectively reduces the manufacturing cost.

The method of placing the object to be injected into the mold of the injection machine so that the outer peripheral surface of the high-voltage coil abuts against at least one supporting auxiliary member provided on the inner wall of the mold includes: using a long strip or short columnar supporting auxiliary member.

Among them, placing the body to be injected into the mold of the injection machine so that the outer peripheral surface of the high-voltage coil abuts against at least one supporting auxiliary part arranged on the inner wall of the mold also includes: arranging a plurality of supporting auxiliary parts so that the plurality of supporting auxiliary parts are evenly distributed in the circumferential direction of the mold to further fix the wire, thereby achieving the purpose of preventing the wire from shifting.

Among them, filling the groove of the high-voltage winding preform so that the high-temperature vulcanized silicone rubber is continuous in the groove includes: filling the silicone rubber compound in the groove; setting a repair mold on the surface of the groove to heat and pressurize the silicone rubber compound, thereby making the silicone rubber compound in the groove and the original high-temperature vulcanized silicone rubber of the high-voltage winding preform tightly bonded together.

Among them, after setting a repair mold on the groove surface to heat and pressurize the silicone rubber compound, the following steps are included: removing the repair mold, performing surface treatment on the repaired part of the high-voltage winding, and thus obtaining a high-voltage winding with a complete surface.

The surface treatment of the repaired part of the high-voltage winding includes: cutting off the rubber material protruding from the outer surface of the high-voltage winding prefabricated part at the repaired part; polishing the repaired part smooth; wiping the surface of the repaired part clean to make the surface treatment of the repaired part smooth and clean.

Among them, a high temperature resistant film is attached to the outer peripheral surface of the winding tooling of the winding equipment; a number of auxiliary parts are bonded and fixed on the high temperature resistant film; a number of winding plates are bonded to the slots of the auxiliary parts to form a winding body.

To achieve the above-mentioned purpose, another technical solution adopted in the present application is: a high-voltage winding, which is manufactured by any of the above-mentioned high-voltage winding preparation methods.

The beneficial effects of the present application are as follows: the preparation method of the present application can prevent the position displacement of the wire during the injection process by setting supporting auxiliary parts, effectively improve the quality stability of the product, and the prepared high-voltage winding has good fire resistance, low temperature resistance, aging resistance and short-circuit test resistance, excellent electrical insulation performance, energy saving and environmental protection.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front view of a dry-type transformer 10 according to an embodiment of the present application;

FIG2 is a top view of a dry-type transformer 10 according to an embodiment of the present application;

FIG3 is a front view of an assembled core 110 according to an embodiment of the present application;

FIG4 is an enlarged view of point G in FIG2 ;

FIG5 is a perspective schematic diagram of a winding body 1310 according to an embodiment of the present application;

FIG6 is a cross-sectional view of a support tube 1311 according to an embodiment of the present application;

FIG. 7 is a three-dimensional schematic diagram of a high-voltage coil 1320 wound on a winding body 1310 according to an embodiment of the present application;

FIG8 is a perspective schematic diagram of a supporting auxiliary member 1340 installed on a mold 102 according to an embodiment of the present application;

FIG9 is a perspective schematic diagram of a high-voltage winding preform prepared after installing a supporting auxiliary member 1340 according to another embodiment of the present application;

FIG10 is an enlarged view of point H in FIG9 ;

FIG11 is a perspective schematic diagram of a high voltage winding 130 according to an embodiment of the present application;

FIG12 is a perspective schematic diagram of a tooling connector 101 according to an embodiment of the present application;

FIG13 is a partial cross-sectional view of a high voltage winding 130 according to an embodiment of the present application;

FIG14 is a perspective schematic diagram of a winding portion 7310 according to another embodiment of the present application;

FIG. 15 is a perspective schematic diagram of an auxiliary component 7312 according to another embodiment of the present application.

Detailed ways

Upon request, specific embodiments of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present application, which may be embodied in various forms. Therefore, the specific details disclosed herein are not considered to be limiting, but only as a basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application in various ways in practice in any appropriate manner, including using the various features disclosed herein and combining features that may not be explicitly disclosed herein.

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

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

In one embodiment, referring to FIGS. 1 to 3 , three transformers are arranged to form a linear structure. The dry-type transformer 10 includes an iron core 110, a low voltage winding 120, and a high voltage winding 130. The iron core 110 includes Three columnar iron core bodies 111, upper iron yokes 112 located at the upper ends of the three columnar iron core bodies 111, and lower iron yokes 113 located at the lower ends of the three columnar iron core bodies 111. Three low-voltage windings 120 are provided, which are respectively sleeved on the outer peripheries of the three columnar iron core bodies 111. Three high-voltage windings 130 are provided, which are respectively sleeved on the outer peripheries of the three low-voltage windings 120, that is, the three columnar iron core bodies 111, the three low-voltage windings 120 and the three high-voltage windings 130 are sleeved one by one from the inside to the outside, thereby forming a three-phase dry-type transformer 10. And the columnar iron core body 111, the low-voltage winding 120, and the high-voltage winding 130 of each phase are coaxially arranged, that is, the axial directions of the three are in the same direction. The columnar iron core 111 is formed by stacking multiple layers of silicon steel sheets, which are tied and fixed with cable ties. The radial cross-section of the columnar iron core 111 is roughly elliptical or circular or other shapes, as long as it can be accommodated in the hollow cavity of the low-voltage winding 120. There is no limitation here. The upper iron yoke 112 and the lower iron yoke 113 are also formed by stacking multiple layers of silicon steel sheets, so that the three columnar iron cores 111 are fixedly connected to form the iron core 110.

As shown in FIG. 1 and FIG. 2 , a core clamp 140 is provided on the outer side of the core 110, and the core clamp 140 is used to clamp the core 110. The core clamp 140 can be a channel steel part or a hollow pipe part, which is not limited here. There are four core clamps 140, two of which are symmetrically located on both sides of the upper end of the core 110; and the other two core clamps 140 are symmetrically located on both sides of the lower end of the core 110. Among them, the material of the core 110 can be metal, fiber reinforced composite material, etc.

As shown in combination with FIG. 2 and FIG. 4 , the low-voltage winding 120 includes a copper foil 121, a low-voltage insulating layer 122 and a support bar 123, and the copper foil 121 and the low-voltage insulating layer 122 are alternately arranged. The copper foil 121 is formed by winding a whole sheet of copper foil paper, and the low-voltage insulating layer 122 overlaps with the copper foil 121 and is wound together, so that the copper foil 121 and the low-voltage insulating layer 122 are alternately arranged.

At least one heat dissipation duct is provided in the low voltage winding 120 , and the heat dissipation duct is located between adjacent copper foils 121 and low voltage insulation layers 122 . A support bar 123 is located in the heat dissipation duct for supporting and isolating adjacent copper foils 121 and low voltage insulation layers 122 .

The low-voltage insulating layer 122 is made of polyimide impregnated paper, which may be specifically SHS-P diphenyl ether prepreg material, or may be DMD insulating paper or silicone rubber film, or other insulating materials, which may be selected according to different temperature rise levels of dry-type transformers.

The insulating support bar 123 is made of glass fiber impregnated with epoxy resin, or aramid fiber impregnated with epoxy resin. In addition, the insulating support bar 123 is a long strip with an I-shaped cross section, which has a more stable mechanical strength. The insulating support bar can also be a long strip with a square cross section or other shapes, which is not limited here.

As shown in FIGS. 5 to 13 , the high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320 and a high-voltage insulating layer 1330, and the wire is wound on the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 includes a support cylinder 1311 and a winding portion 1312, wherein the support cylinder 1311 is a hollow cylinder, which may be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylindrical bodies; the winding portion 1312 is located on the outer circumference of the support cylinder 1311, and the wire is wound in the winding portion 1312 to form the high-voltage coil 1320, and the high-voltage coil 1320 includes a plurality of coil segments, and the plurality of coil segments are arranged at intervals along the axial direction of the support cylinder 1311. The axial direction of the winding body 1310 is in the same direction as the axial direction of the high-voltage winding 130.

The winding part 1312 includes a plurality of winding plates 1313, which are uniformly distributed on the outer peripheral surface of the support tube 1311 in the circumferential direction. Each winding plate 1313 is arranged along the axial direction of the support tube 1311, and the axial length of the winding plate 1313 along the support tube 1311 is less than the axial length of the support tube 1311 along its axial direction. The number of winding plates 1313 is at least two, that is, it can be two, three, four or more, which is not limited here. In order to make the wire winding firm and save materials as much as possible, the number of winding plates 1313 of the 10kV/1000kVA dry-type transformer is set to twelve.

The winding plate 1313 is a rectangular plate, and the longer side of the winding plate 1313 is arranged along the axial direction of the support tube 1311. The winding plate 1313 is also provided with a plurality of winding grooves 1314. The plurality of winding grooves 1314 are arranged 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 is comb-tooth-shaped, that is, a plurality of comb teeth are formed on the winding plate 1313. 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. The tooth height of the comb teeth at both ends of the winding plate 1313 and the tooth height of the comb teeth in the middle of the winding plate 1313 are both greater than the tooth height of the comb teeth in other parts. This is because the field strength at the ends of the high-voltage coil 1320 is uneven. Setting the tooth height at both ends of the winding plate 1313 a little larger can make the electric field uniform. A tap of the tap line needs to be led out in the middle of the winding plate 1313. Setting the tooth height in the middle of the winding plate 1313 a little larger will increase the distance between the corresponding adjacent two winding slots 1314, leaving space for the tap led out from the middle of the winding plate 1313.

At least one section of coil is arranged between two adjacent comb teeth on the winding plate 1313, so that a wire is wound in each winding slot 1314, the high-voltage coil 1320 is reasonably distributed, and each section of coil is arranged at intervals.

A plurality of winding plates 1313 are evenly distributed on the outer circumference of the support tube 1311, and both ends of all winding plates 1313 are arranged flush, and the winding grooves 1314 on all winding plates 1313 are matched one by one in the circumference of the support tube 1311. Each coil segment is wound by a wire along the circumference of the support tube 1311 in a corresponding circle of winding grooves 1314 on all winding plates 1313, with balanced force and good mechanical strength. In other embodiments, the winding plate can also be an annular disk arranged around the circumference of the support tube. A plurality of winding plates are arranged at intervals along the axial direction of the support tube, and the wire is wound in the groove formed by two adjacent winding plates.

In conjunction with Figure 6, the support tube 1311 is a hollow tube formed by glass fiber impregnated with epoxy resin, winding and curing, or pultrusion. It can also be a hollow tube formed by glass fiber or aramid fiber impregnated with epoxy resin, pultrusion and winding. It can also be a hollow tube formed by aramid fiber impregnated with epoxy resin, winding and curing, or pultrusion. It can also be made of other composite materials, which is not limited here.

The winding body 1310 can be formed by separately molding the support tube 1311 and the winding plate 1313 and then bonding them together, or it can be integrally cast into a hollow tube at one time and then turned to form the support tube and the comb-shaped winding plate. In other embodiments, the winding plate and the support tube can also be connected by an auxiliary part. For example, the winding body also includes at least one auxiliary part, which is located on the outer circumferential surface of the support tube and extends radially outwardly along the support tube, so that the auxiliary part surrounds the support tube and forms an annular disk. A corresponding slot is set on the winding plate or the auxiliary part, and the winding plate and the auxiliary part are connected by the slot.

In an application scenario, as shown in FIG. 5 and FIG. 6 , the winding body 1310 further includes two flanges 1315, which are located at two ends of the support tube 1311 and extend radially outward from the support tube 1311. The winding plate 1313 is extended to form an annular disk surface, and the flanges 1315 at both ends are arranged oppositely. When the winding plate 1313 is placed on the outer peripheral 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 flanges 1315 facing each other, so as to prevent the winding plate 1313 from being damaged due to the large injection pressure during the injection of the high-voltage insulation layer 1330. In addition, in the radial direction of the winding body 1310, that is, in the radial direction of the support cylinder 1311, the width of the two flanges 1315 is equal to or slightly smaller than the width of the high-voltage coil 1320, so as to ensure that the subsequent support auxiliary part 1340 can smoothly abut against the outer peripheral surface of the high-voltage coil 1320 after installation. Among them, the width of the flange 1315 is the distance that the flange 1315 extends outward from the outer wall of the support cylinder 1311 along the radial direction of the support cylinder 1311, that is, the distance that the flange 1315 protrudes from the outer wall of the support cylinder 1311; the width of the high-voltage coil 1320 is the ring width of the high-voltage coil 1320.

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

As shown in combination with Figures 5 and 7, the wire is circumferentially wound on the outer circumference of the winding body 1310 to form a high-voltage coil 1320. Specifically, the wire is wound from one end of the winding body 1310 to the other end of the winding body 1310, and is wound in the winding groove 1314 at one end of the winding body 1310 to the winding groove 1314 at the other end of the winding body 1310, so that the high-voltage coil 1320 is spaced apart in the axial direction of the support cylinder 1311, and two external connections are formed at the head and tail ends of the wire after winding, namely a first external connection D and a second external connection X, the first external connection D is used to connect the cable, and the second external connection X is used to connect other external connections, such as in a three-phase transformer, for interconnection with each phase transformer. The wire leads out of six taps in the middle of the winding body 1310 along its axial direction, namely tap 2, tap 3, tap 4, tap 5, tap 6 and tap 7. The six taps form a tap switch. For the convenience of description, tap 2, tap 4 and tap 6 are defined as the first tap switch, and tap 3, tap 5 and tap 7 are defined as the second tap switch.

When the wire is wound, it is wound in a circle of winding grooves 1314 corresponding to all winding plates 1313, so that each coil formed by the winding of the wire is perpendicular to the axial direction of the support tube 1311, the winding is convenient and the wire is arranged neatly, the winding plates 1313 and the support tube 1311 are evenly stressed, and the mechanical strength is good.

As shown in FIG13, it is a partial cross-sectional view of the high-voltage winding 130 coated with a high-voltage insulating layer 1330 cut along its axial direction. The wire adopts the aforementioned winding method and is wound in a comb-tooth-shaped winding plate 1313 to form a pancake-shaped high-voltage coil 1320. In the axial direction of the high-voltage winding 130, the pancake-shaped high-voltage coil 1320 is arranged with a comb-tooth interval with the winding plate 1313, that is, a pancake coil is arranged between two adjacent comb teeth. The coil structure has good mechanical strength and strong ability to withstand the electromotive force generated by short-circuit current. Compared with the layered coil, it has more pancakes and better heat dissipation capacity.

In the axial direction of the support cylinder 1311, as shown in FIG. 11, tap 6, tap 4 and tap 2 are sequentially distributed to form a first tap switch, and tap 3, tap 5 and tap 7 are sequentially distributed A second tap switch is formed, and the first tap switch is arranged in parallel with the second tap switch to form a tap device of the high-voltage coil 1320, which is used for the dry-type transformer 10 to adjust the voltage according to different operating conditions.

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

In conjunction with Figures 7 to 11, the high-voltage insulation layer 1330 wraps the high-voltage coil 1320 and the winding body 1310 to form the high-voltage winding 130. Among them, the high-voltage insulation layer 1330 is a high-temperature vulcanized silicone rubber, which improves the insulation performance and mechanical properties of the high-voltage winding 130 as a whole. Specifically, the wire is first wound on the winding body 1310 to form the high-voltage coil 1320, and the winding body 1310 and the high-voltage coil 1320 are used as the body to be injected, and then the body to be injected is placed in the mold 102 of the injection molding machine (Figure 8 briefly shows a partial structural diagram of the mold 102), and by adding silicone rubber raw materials, high-temperature vulcanized silicone rubber is injected as a whole on the periphery of the body to be injected to obtain a high-voltage winding preform as shown in Figure 9. The high-temperature vulcanized silicone rubber of the present application adopts a high-temperature vulcanized silicone rubber material system, which specifically includes raw rubber, reinforcing agent, flame retardant, heat-resistant agent and other auxiliary materials.

The mold 102 of the injection molding machine is a hollow cylinder with a certain thickness as a whole, and the inner cavity size of the mold 102 is consistent with the outer size of the high-voltage winding 130. The inner wall of the mold 102 is provided with a supporting auxiliary part 1340. After the winding body 1310 wound with the high-voltage coil 1320 is placed in the mold 102, the supporting auxiliary part 1340 abuts against the outer peripheral surface of the high-voltage coil 1320, and the length direction of the supporting auxiliary part 1340 is arranged along the axial direction of the mold 102, further fixing the wire, thereby achieving the purpose of preventing the wire from shifting. At this time, the axial direction of the winding body 1310 is in the same direction as the axial direction of the mold 102.

The supporting auxiliary part 1340 is in the shape of a long strip and is detachably fixedly connected to the inner wall of the mold 102. Specifically, threaded holes are provided at both ends of the supporting auxiliary part 1340, and threaded holes are also provided at corresponding positions along the axial direction of the mold 102. The mold 102 and the supporting auxiliary part 1340 can be assembled by inserting fasteners such as screws through the corresponding threaded holes on the mold 102 and the supporting auxiliary part 1340. The supporting auxiliary part 1340 is detachably connected to the mold 102, so that the mold 102 can also be used for the preparation of high-voltage windings without supporting auxiliary parts, which has a wider range of applications and effectively reduces the manufacturing cost. Among them, the length of the supporting auxiliary part 1340 is equal to the axial length of the inner cavity of the mold 102, that is, the length of the supporting auxiliary part 1340 is equal to the axial length of the high-voltage winding 130 and slightly larger than the axial length of the high-voltage coil 1320. Therefore, when the supporting auxiliary part 1340 is installed along the axial direction of the mold 102, it can abut the outer peripheral surface of the entire high-voltage coil 1320 in the axial direction of the winding body 1310, ensuring that each section of the high-voltage coil 1320 in the axial direction of the winding body 1310 can be protected.

In other embodiments, the supporting auxiliary part may also be set at a certain angle to the winding body, and the supporting auxiliary part may also be fixedly connected to the mold by welding, clamping or other connection methods. As long as a reliable connection between the supporting auxiliary part and the mold can be achieved, there is no limitation here.

In this embodiment, the number of the supporting auxiliary members 1340 is two, and the two supporting auxiliary members 1340 are symmetrically arranged along the axial direction of the mold 102 in the circumferential direction of the inner cavity of the mold 102, so that the two supporting auxiliary members 1340 are The two supporting auxiliary parts 1340 are symmetrically abutted against the two sides of the high-voltage coil 1320, so that the force applied by the two supporting auxiliary parts 1340 to the high-voltage coil 1320 is more uniform and stable, further preventing the displacement of the wire due to uneven force. Of course, in other embodiments, three, four or more supporting auxiliary parts can also be provided, and the multiple supporting auxiliary parts are evenly distributed in the circumferential direction of the mold, as long as the supporting auxiliary parts can abut against the outer peripheral surface of the high-voltage coil to prevent the displacement of the wire, no specific limitation is made here.

In this embodiment, the supporting auxiliary member 1340 is made of mold steel, which has high mechanical strength, can withstand the pressure during the injection of high-temperature vulcanized silicone rubber, and can be reused. In other embodiments, the supporting auxiliary member can also be made of other metal materials, which is not limited here.

In this embodiment, the supporting auxiliary part 1340 is a long strip with a rectangular cross-section, that is, the supporting auxiliary part 1340 is a rectangular parallelepiped structure. In other embodiments, the supporting auxiliary part can also be a long strip with a triangular, pentagonal or other shaped cross-section. As long as the supporting auxiliary part can firmly abut the outer peripheral surface of the high-voltage coil, there is no limitation here.

In other embodiments, the supporting auxiliary part may also be in the shape of a short column. Specifically, the supporting auxiliary part includes a plurality of short columns, and the plurality of short columns are fixedly connected to the mold, so that after the winding body wound with the high-voltage coil is placed in the mold, the plurality of short columns abut the outer peripheral surface of the high-voltage coil. Preferably, the plurality of short columns of the supporting auxiliary part are evenly arranged along the axial direction of the mold and are fixedly connected to the mold, and the plurality of supporting auxiliary parts are evenly arranged along the circumference of the mold to further fix the wire, thereby achieving the purpose of preventing the wire from shifting. In the axial direction of the winding body, the distance between the end faces of the two short columns farthest apart in the supporting auxiliary part that are away from each other is the total length of the supporting auxiliary part, and the total length is equal to the axial length of the inner cavity of the mold, that is, equal to the axial length of the high-voltage winding and slightly larger than the axial length of the high-voltage coil, so that the plurality of short columns can evenly abut the outer peripheral surface of the high-voltage coil, ensuring that each section of the high-voltage coil in the axial direction of the winding body can be protected.

Furthermore, since the inner wall of the mold 102 is provided with a supporting auxiliary part 1340, after high-temperature vulcanized silicone rubber is injected integrally around the periphery of the body to be injected, a high-voltage winding preform having a groove 1341 on the surface as shown in FIG. 9 is obtained by demolding. Subsequently, the groove 1341 needs to be filled so that the high-temperature vulcanized silicone rubber is continuous at the groove 1341, that is, the silicone rubber compound is filled in the groove 1341 so that the silicone rubber compound fills the groove 1341, and then a repair mold is set on the surface of the groove 1341 filled with the silicone rubber compound to heat and pressurize the silicone rubber compound. The inner surface of the repair mold fits tightly with the outer surface of the high-voltage winding preform. The high-voltage winding preform is repaired by providing the temperature and pressure required for the molding of the high-temperature vulcanized silicone rubber through the repair mold, so that the silicone rubber compound in the groove 1341 is tightly bonded to the original high-temperature vulcanized silicone rubber of the high-voltage winding preform. Finally, the repair mold is removed and the repaired part is surface treated so that the high-temperature vulcanized silicone rubber is continuous at the groove 1341, and a high-voltage winding 130 with a complete surface can be obtained.

In the radial direction of the winding body 1310, the distance between the outer surface of the high-voltage insulation layer 1330 and the outer surface of the corresponding high-voltage coil 1320 is defined as the thickness of the high-voltage insulation layer 1330. At any position of the high-voltage winding 130, the thickness of the high-voltage insulation layer 1330 is equal, so that the cross-sectional shape of the high-voltage winding 130 is similar to the cross-sectional shape of the support tube 1311, so that the center of gravity of the high-voltage winding 130 is Roughly consistent with the center of gravity of the winding body 1310.

After the high-voltage coil 1320 and the winding body 1310 are covered with the high-temperature vulcanized silicone rubber by overall vacuum injection, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the winding body 1310 and wraps the two ends of the winding body 1310, and the high-temperature vulcanized silicone rubber does not cover the inner wall of the support tube 1311, so that the high-voltage winding 130 is a hollow column as a whole, which can be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylindrical bodies.

Before the overall injection of high temperature vulcanized silicone rubber, the six taps are connected by setting a tooling connector 101 to prevent the six taps from being covered by silicone rubber during the injection process and being unable to be used for wiring. As shown in FIG9 , the tooling connector 101 is an aluminum alloy plate, and a protective cavity is provided on the plate surface of the tooling connector 101. The protective cavity is six identical step holes 1011, and the inner wall of the step hole 1011 is also provided with a thread. The six step holes 1011 are arranged in parallel in two rows, and three step holes 1011 are arranged in each row so that the first tap switch and the second tap switch are also arranged in parallel. At the same time, before the overall injection, after the six taps are connected to the six step holes 1011 respectively, bolts are connected in the six step holes 1011. In this way, the bolts can directly fill the remaining space of the step hole 1011 to prevent the silicone rubber from filling the six step holes 1011, thereby preventing the six taps from being covered by silicone rubber and being unable to be used for wiring.

In another application scenario, as shown in Figures 14 and 15, the winding body only includes a winding part 7310, that is, the winding body is not provided with a supporting tube, that is, the winding body omits the structure of the rigid insulating inner liner tube, so that the high-voltage winding has a better thermal conductivity, eliminates the interface between the high-voltage insulation layer and the rigid insulating inner liner tube, thereby suppressing the surface discharge of the rigid insulating inner liner tube, saving materials and reducing costs.

Specifically, the winding part 7310 includes a plurality of comb-shaped winding plates 7311 and a plurality of auxiliary parts 7312, wherein the plurality of auxiliary parts 7312 are annular and arranged at intervals along the axial direction of the auxiliary parts 7312, and the winding plates 7311 are fixed to the outer periphery of the plurality of auxiliary parts 7312 along the axial direction of the auxiliary parts 7312, so that the winding plates 7311 are connected to all auxiliary parts 7312 at the same time, and the plurality of winding plates 7311 are evenly distributed along the circumference of the auxiliary parts 7312. Among them, the axial direction of the auxiliary parts 7312 is the axial direction of the winding part 7310, that is, the axial direction of the high-voltage winding. The auxiliary parts 7312 can be annular or elliptical, and can be designed according to the overall shape of the high-voltage winding. The plurality of winding plates 7311 are arranged circumferentially, and the wire is wound on the winding part 7310 to form a high-voltage coil, and the high-voltage coil includes a plurality of coil segments, and the plurality of coil segments are arranged at intervals along the axial direction of the high-voltage winding, and the high-voltage insulation layer wraps the high-voltage coil, the plurality of auxiliary parts 7312 and the winding plates 7311. The auxiliary part 7312 can maintain the stable setting of the winding plate 7311, and avoid the movement and dislocation of the winding plate 7311 during the wire winding process and the high-voltage insulation layer injection process.

In one embodiment, a plurality of slots 73121 are provided on the outer surface of the auxiliary part 7312, and the plurality of slots 73121 are evenly arranged along the circumference of the auxiliary part 7312. The side surfaces of the plurality of winding plates 7311 are respectively and correspondingly arranged in the plurality of slots 73121, so that the plurality of winding plates 7311 are evenly distributed around the outer circumference of the plurality of auxiliary parts 7312; both ends of all the winding plates 7311 are arranged flush, and the slots 73121 on all the auxiliary parts 7312 are matched one by one in the axial direction of the auxiliary part 7312, so that each winding plate 7311 can be arranged along the axial direction of the auxiliary part 7312, so that the wire can be wound in the comb teeth on the winding plate 7311 to form a high voltage. The coil, that is, several sections of the high-voltage coil, are spaced apart and distributed in the axial direction of the winding portion 7310, with balanced force and good mechanical strength.

The width of the slot 73121 along the circumferential direction of the auxiliary part 7312 is defined as the slot width of the slot 73121. The slot width of the slot 73121 matches the thickness of the winding plate 7311, so that the winding plate 7311 and the auxiliary part 7312 are firmly assembled, thereby preventing the winding plate 7311 from being difficult to align and fix on the auxiliary part 7312 when the slot width of the slot 73121 is smaller than the thickness of the winding plate 7311, or preventing the winding plate 7311 from falling off the auxiliary part 7312 when the slot width of the slot 73121 is larger than the thickness of the winding plate 7311. The winding board 7311 is fixedly connected in the slot 73121 by an adhesive. The adhesive is a two-component high-temperature resistant epoxy adhesive. Of course, it can also be other adhesives, but it is necessary to ensure that the adhesive can make the winding board 7311 and the auxiliary part 7312 firmly bonded, and the adhesive must be resistant to high temperatures to adapt to the high-voltage insulation layer using high-temperature injection to cover the winding board 7311 and the auxiliary part 7312.

In other embodiments, a slot may be provided on the side of the winding plate near the auxiliary part, and the auxiliary part is clamped in the slot of the winding plate, so that the winding plate and the auxiliary part are fixedly connected. Of course, it is preferred that the slot 73121 is provided on the auxiliary part 7312 in the aforementioned embodiment to avoid weakening the mechanical strength of the winding plate due to the provision of the slot.

The winding plate 7311 is a comb tooth plate 7311, and the structure of the comb tooth plate 7311 is similar to that of the aforementioned winding plate 1313, except that both ends of the comb tooth plate 7311 are provided with flow grooves 73111, which facilitate the injection molding process of the high-voltage insulation layer. The injected silicone rubber material can flow from the end of the winding part 7310 into the inner side of the winding part 7310, thereby allowing the high-voltage insulation layer to fully fill the gap between the winding part 7310 and the high-voltage coil and the two ends of the winding part 7310.

The winding plate 7311 and the auxiliary part 7312 are both made of glass fiber impregnated with epoxy resin, and multiple layers of glass fiber cloth impregnated with epoxy resin are stacked to a certain thickness, and then molded and cured to form a glass fiber reinforced plastic part. In this embodiment, the winding plate 7311 and the auxiliary part 7312 are separately formed and then bonded and fixed. In other embodiments, the winding plate and the auxiliary part can also be integrally formed.

In another embodiment, in combination with FIG. 1 to FIG. 15 , a method for preparing a high voltage winding 130 is provided, comprising the following steps:

Step ①: The wire is circumferentially wound along the outer circumference of the winding body 1310 to form the high-voltage coil 1320, and a tap is formed during the wire winding process.

First, prepare the winding body 1310, and set flanges 1315 at both ends of the winding body 1310. Specifically, the winding body 1310 includes a support tube 1311 and a winding portion 1312 located on the outer circumferential surface of the support tube 1311. The specific structure, material, molding method of the support tube 1311 and the winding plate 1313, and the connection method between the support tube 1311 and the winding plate 1313 are as described above and will not be repeated here. The winding body 1310 also includes two flanges 1315, which are located at the two ends of the support tube 1311 and extend outward from the outer wall of the support tube 1311 along the radial direction of the support tube 1311 to form an annular disk surface. The flanges 1315 at both ends are arranged opposite to each other, and in the radial direction of the winding body 1310, that is, in the radial direction of the support tube 1311, the width of the two flanges 1315 is equal to or slightly smaller than the width of the high-voltage coil 1320, so as to ensure the installation of the support auxiliary part 1340. After that, it can smoothly abut the outer peripheral surface of the high-voltage coil 1320.

Secondly, the winding body 1310 is sleeved on the winding device, and the high-voltage coil 1320 is formed by winding the wire on the winding body 1310, so that the high-voltage coil 1320 is arranged at intervals along the axial direction of the support cylinder 1311, thereby forming a pancake-shaped high-voltage coil 1320. The wire winding method and the structure of the high-voltage coil 1320 are consistent with the above, and will not be repeated.

During the winding process, the wires are respectively led out to tap 2, tap 3, tap 4, tap 5, tap 6 and tap 7, thereby forming a tap switch. In other embodiments, the tap switch may also include only four taps, which is not limited here.

In another application scenario, the support tube of the winding body is connected to the winding part by an auxiliary part, so the winding body is pre-assembled before this step. The auxiliary part is fixed to the outer periphery of the support tube by an adhesive, and then the auxiliary part and the winding plate are connected by corresponding clamping, so that a plurality of winding plates are arranged axially along the support tube and circumferentially evenly distributed on the outer peripheral surface of the support tube, thereby realizing the assembly of the winding body. Alternatively, the winding plate and the auxiliary part may be fixedly connected first, and then fixed to the outer periphery of the support tube, without specific limitation. The assembled winding body is then sleeved on the winding equipment to wind the wire to form a high-voltage coil, and the tap is led out, as described above, and will not be repeated here.

In another application scenario, the winding body only includes a winding portion 7310, and the winding portion 7310 includes a plurality of comb-shaped winding plates 7311 and a plurality of auxiliary parts 7312. The specific structure is as described above and will not be repeated here. Since the winding portion 7310 is not provided with a support cylinder, in order to facilitate subsequent demolding, it is necessary to first affix a high-temperature resistant film to the outer peripheral surface of the winding tooling of the winding equipment, fix a plurality of auxiliary parts 7412 on the high-temperature resistant film with an adhesive, and then bond a plurality of winding plates 7311 to the corresponding slots 73121 on the auxiliary parts 7412, so that the winding portion 7310 is sleeved on the winding equipment to form a winding body, and then the wire is wound to form a high-voltage coil, and the tap is led out.

Step ②: Place the tap in the protective cavity of the tooling connector 101 and connect and fix it to the tooling connector 101 to obtain the body to be injected.

Through the tooling connector 101 as shown in Figure 12, the six taps are respectively connected and fixed to the protective cavity of the tooling connector 101. In the present application, the protective cavity is six stepped holes 1011, which can be connected by welding or fixed by other methods, which are not limited here.

Step ③: Place the object to be injected into the mold 102 of the injection molding machine so that the outer peripheral surface of the high-voltage coil 1320 abuts against at least one supporting auxiliary part 1340 provided on the inner wall of the mold 102 .

Before this step, bolts are connected in the six stepped holes 1011 of the tooling connector 101. In this way, the bolts can directly fill the remaining space of the stepped holes 1011 to prevent the silicone rubber from filling the six stepped holes 1011, thereby preventing the six taps from being covered by the silicone rubber and being unable to be used for wiring.

The wire is wound on the winding body 1310 to form a high-voltage coil 1320. The winding body 1310 and the high-voltage coil 1320 connected with the tooling connector 101 are used as the body to be injected. Then, after the coupling agent is coated on the periphery of the body to be injected, the body to be injected is placed in the mold 102 so that the supporting auxiliary part 1340 abuts against the outer peripheral surface of the high-voltage coil 1320 to further fix the wire, thereby achieving the purpose of preventing the wire from shifting.

Among them, a long strip or short columnar support auxiliary member 1340 is used, and a plurality of support auxiliary members 1340 are provided. The support auxiliary member 1340 is detachably fixedly connected to the inner wall of the mold 102 of the injection molding machine along the axial direction of the mold 102, so that the plurality of support auxiliary members 1340 are evenly distributed in the circumferential direction of the mold. The specific structure and material of the support auxiliary member 1340, and the fixing method of the support auxiliary member 1340 and the mold 102 are as described above and will not be repeated.

Among them, in the radial direction of the support cylinder 1311, the width of the two flanges 1315 is equal to or slightly smaller than the width of the high-voltage coil 1320. After the support auxiliary member 1340 is installed on the mold 102, the flange 1315 will not hinder the support auxiliary member 1340 from abutting against the outer peripheral surface of the high-voltage coil 1320, thereby achieving the purpose of preventing the displacement of the wire. Otherwise, if the width of the flange 1315 is too large and larger than the width of the high-voltage coil 1320, when the body to be injected is placed in the mold 102, the two ends of the support auxiliary member 1340 fixed on the mold 102 will respectively abut against the outer side surfaces of the two flanges 1315, so that the support auxiliary member 1340 cannot abut against the outer peripheral surface of the high-voltage coil 1320; if the width of the flange 1325 is too small, its mechanical strength will be significantly reduced, and it will not be possible to prevent the winding plate 1313 from being damaged due to the large injection pressure during the injection of the high-voltage insulation layer 1330.

In another application scenario, the winding body only includes a winding portion 7310, and the wire is wound on the winding portion 7310 to form a high-voltage coil. The winding body and the high-voltage coil connected to the tooling connector 101 are used as the body to be injected, and then after the coupling agent is coated on the periphery of the body to be injected, the body to be injected is placed in the mold 102, so that the supporting auxiliary part 1340 abuts against the outer peripheral surface of the high-voltage coil 1320, further fixing the wire, thereby achieving the purpose of preventing the wire from shifting. Among them, since the winding body omits the rigid insulating inner liner, there is no flanging structure, and the supporting auxiliary part 1340 is directly fixedly connected to the inner wall of the mold 102 of the injection machine, so that several supporting auxiliary parts 1340 abut against the outer peripheral surface of the high-voltage coil. The specific structure, material and fixing method of the supporting auxiliary part 1340 with the mold 102 are as described above and will not be repeated.

Step ④: high-temperature vulcanized silicone rubber is injected around the body to be injected to obtain a high-voltage winding preform with grooves 1341 on the surface.

Silicone rubber raw materials are added and high-temperature vulcanized silicone rubber is injected as a whole around the periphery of the body to be injected, so that the high-temperature vulcanized silicone rubber covers the high-voltage coil 1320 and the winding body 1310. After demolding, a high-voltage winding preform with a groove 1341 on the surface as shown in Figure 9 is obtained.

Step ⑤: Fill the groove 1341 of the high-voltage winding preform so that the high-temperature vulcanized silicone rubber is continuous at the groove 1341 .

The groove 1341 of the high-voltage winding preform is filled with silicone rubber compound, so that the silicone rubber compound fills the groove 1341, and then a repair mold is set on the surface of the groove 1341 filled with silicone rubber compound to heat and pressurize the silicone rubber compound, and the inner surface of the repair mold is closely fitted with the outer surface of the high-voltage winding preform. The high-voltage winding preform is repaired by providing the temperature and pressure required for the high-temperature vulcanized silicone rubber molding through the repair mold, so that the silicone rubber compound in the groove 1341 and the original high-temperature vulcanized silicone rubber of the high-voltage winding preform are closely bonded together, and finally the repair mold is removed and the surface treatment is performed on the repaired part, so that the high-temperature vulcanized silicone rubber is continuous at the groove 1341, thereby obtaining a high-voltage winding with a complete surface. Group 130.

In this embodiment, the surface treatment of the repaired part includes: first, using a knife or other tools to cut off the excess rubber at the repaired part, that is, cutting off the rubber protruding from the outer surface of the high-voltage winding prefabricated part at the repaired part, so that the thickness of the high-voltage insulation layer 1330 is equal at any position of the high-voltage winding 130; then, using sandpaper to polish the repaired part smooth; finally, using alcohol to wipe the surface of the repaired part clean. In other embodiments, other types of surface treatment methods can also be used, as long as the surface of the repaired part can be treated smooth and clean, and there is no limitation here.

Step ⑥: Remove the tooling connector 101 to obtain the high-voltage winding 130 with the tap exposed outside the high-temperature vulcanized silicone rubber.

After the high-voltage insulation layer 1330 is formed by vacuum injection, the side of the tooling connector 101 is covered with a small amount of silicone rubber, and the silicone rubber covered on the tooling connector 101 is relatively small. The tooling connector 101 can be directly removed by tools to expose the tap, and finally form the high-voltage winding 130 as shown in Figure 11.

In another application scenario, the tooling connector can be removed first to obtain a high-voltage winding preform with the tap exposed outside the high-temperature vulcanized silicone rubber, and then the high-temperature vulcanized silicone rubber can be filled in the groove of the high-voltage winding preform, that is, the order of step ⑤ and step ⑥ can be interchanged, as long as the high-temperature vulcanized silicone rubber can be made continuous at the groove 1341 to obtain a high-voltage winding 130 with a complete surface, and no specific limitation is made here.

The beneficial effects of the present application are as follows: Different from the prior art, the high-voltage insulation layer of the high-temperature vulcanized silicone rubber of the present application has the following advantages: 1) It has good fire resistance, low-temperature resistance, aging resistance and short-circuit test resistance, which can effectively extend the service life of the dry-type transformer; 2) The copper coil is easy to peel off from the silicone rubber, and the material recovery rate is greater than 99%, which is more environmentally friendly; 3) The silicone rubber elastomer can weaken the local discharge inducement caused by mechanical vibration, and has an inhibitory effect on the discharge of the equipment, and the product of the silicone rubber under the discharge is non-conductive silicon dioxide, which can effectively inhibit the continued degradation of the insulation; 4) It can reduce the operating loss of the transformer and save more energy; 5) It has good resistance to harsh environments and can be installed indoors and outdoors.

At the same time, the silicone rubber of the present application is formed by overall high-temperature vulcanization injection molding. This process method makes the high-voltage insulation layer more stable, has higher mechanical properties, and has better bonding performance with the high-voltage coil and winding body, which can effectively extend the service life of the high-voltage insulation layer. And compared with liquid silicone rubber, the high-temperature vulcanized silicone rubber filler of the present application is evenly dispersed, and will not cause partial discharge in the dry-type transformer due to filler agglomeration, making the overall performance of the dry-type transformer better.

In addition, the present application can prevent the guide wire from shifting in position during the injection process by providing supporting auxiliary parts, thereby effectively improving the quality stability of the product.

The technical content and technical features of the present application have been disclosed as above, but it is understood that under the creative idea of the present application, those skilled in the art can make various changes and improvements to the above structures and materials, including the combination of technical features disclosed or claimed separately here, and obviously including other combinations of these features. These variations and/or combinations all fall within the technical field involved in the present application and fall within the protection scope of the claims of the present application.

Claims

A method for preparing a high voltage winding, characterized in that it comprises the following steps:

The conductor is circumferentially wound along the outer circumference of the winding body to form a high-voltage coil, and a tap is formed during the winding process of the conductor;

Placing the tap in the protective cavity of the tooling connector and connecting and fixing it to the tooling connector to obtain a body to be injected;

Putting the object to be injected into a mold of an injection molding machine so that the outer peripheral surface of the high-voltage coil abuts against at least one supporting auxiliary member provided on the inner wall of the mold;

Injecting high-temperature vulcanized silicone rubber around the body to be injected to obtain a high-voltage winding preform with grooves on the surface;

Filling the groove of the high-voltage winding preform so that the high-temperature vulcanized silicone rubber is continuous at the groove;

The tooling connector is removed to obtain the high-voltage winding with the tap exposed outside the high-temperature vulcanized silicone rubber.
The preparation method according to claim 1 is characterized in that the wire is circumferentially wound along the outer circumference of the winding body to form a high-voltage coil, and before the tap is formed in the wire winding process, the process includes:

Flanged edges are provided at both ends of the winding body, and in the radial direction of the winding body, the width of the flanged edges is equal to or slightly smaller than the width of the high-voltage coil.
The preparation method according to claim 1 is characterized in that placing the object to be injected into the mold of the injection machine so that the outer peripheral surface of the high-voltage coil abuts against at least one supporting auxiliary member provided on the inner wall of the mold comprises:

The supporting auxiliary component is detachably fixedly connected to the inner wall of the mold along the axial direction of the mold.
The preparation method according to claim 1 is characterized in that placing the object to be injected into the mold of the injection machine so that the outer peripheral surface of the high-voltage coil abuts against at least one supporting auxiliary member provided on the inner wall of the mold comprises:

The supporting auxiliary member is in the shape of a long strip or a short column.
The preparation method according to claim 1 is characterized in that the step of placing the object to be injected into a mold of an injection molding machine so that the outer peripheral surface of the high-voltage coil abuts against at least one supporting auxiliary member provided on the inner wall of the mold further comprises:

A plurality of the supporting auxiliary members are arranged so that the plurality of the supporting auxiliary members are evenly distributed in the circumferential direction of the mold.
The preparation method according to claim 1, characterized in that the step of filling the groove of the high-voltage winding preform so that the high-temperature vulcanized silicone rubber continuously at the groove comprises:

The groove is filled with a silicone rubber compound; a repair mold is arranged on the surface of the groove to heat and pressurize the silicone rubber compound.
The preparation method according to claim 6, characterized in that after the repairing mold is set on the surface of the groove to heat and pressurize the silicone rubber compound, it includes:

The repairing mold is removed, and the repaired part of the high-voltage winding is subjected to surface treatment.
The preparation method according to claim 7, characterized in that the surface treatment of the repaired portion of the high-voltage winding comprises:

The rubber material protruding from the outer surface of the high-voltage winding prefabricated part at the repaired part is cut off; the repaired part is polished to be smooth; and the surface of the repaired part is wiped clean.
The preparation method according to claim 1 is characterized in that before the wire is circumferentially wound along the outer circumferential surface of the winding body to form a high-voltage coil, it includes:

A high temperature resistant film is attached to the outer peripheral surface of the winding tooling of the winding equipment; a plurality of auxiliary parts are bonded and fixed on the high temperature resistant film; a plurality of winding plates are bonded correspondingly in the slots of the auxiliary parts to form the winding body.
A high-voltage winding, characterized in that the high-voltage winding is made by the high-voltage winding preparation method according to any one of claims 1 to 9.