CN115512960A

CN115512960A - Preparation method of high-voltage winding and high-voltage winding

Info

Publication number: CN115512960A
Application number: CN202211202027.XA
Authority: CN
Inventors: 马婷婷; 张鑫鑫; 姜建飞; 董积信; 刘超; 马斌
Original assignee: Jiangsu Shemar Electric Co Ltd
Current assignee: Jiangsu Shemar Electric Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2022-12-23
Also published as: WO2024066824A1

Abstract

The application discloses a preparation method of a high-voltage winding, which comprises the following steps: the conducting wire is wound along the peripheral surface of the winding body in the circumferential direction to form a high-voltage coil, and a tap is formed in the winding process of the conducting wire; placing the tap in a protection cavity of the tool connecting piece and fixedly connecting the tap with the tool connecting piece to obtain a body to be injected; putting a body to be injected into a mould of an injection machine, so that the peripheral surface of the high-voltage coil is abutted against at least one supporting auxiliary piece arranged on the inner wall of the mould; injecting to form high-temperature vulcanized silicone rubber at the periphery of the body to be injected to obtain a high-voltage winding prefabricated part with a groove on the surface; filling the groove of the high-voltage winding prefabricated part so that the high-temperature vulcanized silicone rubber is continuous at the groove; and removing the tool connecting piece to obtain the high-voltage winding of which the tap is exposed outside the high-temperature vulcanized silicone rubber. The application also discloses a high-voltage winding. This application supports the auxiliary member through setting up and effectively prevents the wire skew.

Description

Preparation method of high-voltage winding and high-voltage winding

Technical Field

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

Background

At present, transformers can be divided into: oil-immersed transformers, dry-type transformers, gas transformers. The dry type transformer has the advantages of oil free, fire prevention, long service life, energy saving, low noise, simple maintenance, safety, reliability and the like. The dry-type transformers currently on the market are mostly resin-cast high-voltage winding dry-type transformers and open dry-type transformers. Although dry-type transformers have been developed greatly in the last 10 years, the problems of insulation cracking, poor heat conduction, severe operating environment and the like still exist in operation. Meanwhile, in the process of forming the high-voltage winding of the dry-type transformer, the lead is easy to shift, and the quality of a product is affected.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a preparation method of a high-voltage winding, which can be used for preparing the high-voltage winding, solving the problem of wire displacement in the injection process and avoiding influencing the product quality.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: a preparation method of a high-voltage winding comprises the following steps: the conducting wire is wound along the peripheral surface of the winding body in the circumferential direction to form a high-voltage coil, and a tap is formed in the winding process of the conducting wire; placing the tap in a protection cavity of the tool connecting piece and fixedly connecting the tap with the tool connecting piece to obtain a body to be injected; putting a body to be injected into a mould of an injection machine, so that the peripheral surface of the high-voltage coil is abutted against at least one supporting auxiliary piece arranged on the inner wall of the mould; injecting the high-temperature vulcanized silicone rubber at the periphery of the body to be injected to obtain a high-voltage winding prefabricated part with a groove on the surface; filling the groove of the high-voltage winding prefabricated part so that the high-temperature vulcanized silicone rubber is continuous at the groove; and removing the tool connecting piece to obtain the high-voltage winding of which the tap is exposed outside the high-temperature vulcanized silicone rubber.

The method can be used for preparing the high-voltage winding, the high-voltage insulating layer is more stable through the high-temperature vulcanized silicone rubber injection process, the mechanical property is higher, the service life is longer, the supporting auxiliary part is arranged, the position deviation of a lead in the injection process can be prevented, and the quality stability of a product is effectively improved.

Wherein, the wire carries out circumference coiling along the outer peripheral face of winding body and forms high-voltage coil, and the wire coiling in-process includes before forming the tap: the two ends of the winding body are provided with flanges, and the width of the flanges is equal to or slightly smaller than that of the high-voltage coil in the radial direction of the winding body so as to ensure that the supporting auxiliary part can be smoothly abutted to the peripheral surface of the high-voltage coil after being installed.

Wherein, will treat that the injection body is put into the mould of injection machine for the outer peripheral face of high-voltage coil and at least one support auxiliary member butt that the mould inner wall set up include: the supporting auxiliary member is detachably and fixedly connected to the inner wall of the mold in the axial direction of the mold. The supporting auxiliary part and the die are detachably connected, so that the die can also be suitable for the preparation of high-voltage windings without the supporting auxiliary part, the application range is wider, and the manufacturing cost is effectively reduced.

Wherein, will treat that the injection body is put into the mould of injection machine for the outer peripheral face of high-voltage coil and at least one support auxiliary member butt that the mould inner wall set up include: an elongated or short-column shaped support auxiliary is adopted.

Wherein, will treat that the injection body is put into the mould of injection machine for the outer peripheral face of high-voltage coil still includes with at least one support auxiliary member butt that the mould inner wall set up: the plurality of supporting auxiliary parts are arranged, so that the plurality of supporting auxiliary parts are uniformly distributed in the circumferential direction of the die, the lead is further fixed, and the purpose of preventing the lead from shifting is achieved.

Wherein, fill the recess of the prefabricated member of high-voltage winding so that high-temperature vulcanized silicone rubber includes in succession at the recess: filling silicon rubber compound in the groove; and arranging a repairing mould on the surface of the groove to heat and pressurize the silicon rubber compound, so that the silicon rubber compound in the groove is tightly bonded with the original high-temperature vulcanized silicon rubber of the high-voltage winding prefabricated part.

Wherein, set up on the recess surface and repair the mould and include after heating, pressurization to the silicon rubber gross rubber: and removing the repairing mould, and carrying out surface treatment on the repaired part of the high-voltage winding to obtain the high-voltage winding with a complete surface.

Wherein, the surface treatment of the repaired part of the high-voltage winding comprises the following steps: cutting off the sizing material protruding out of the outer surface of the high-voltage winding prefabricated part at the repaired position; polishing the repaired part smoothly; wiping the surface of the repaired part to be clean, so that the surface of the repaired part is processed to be smooth and clean.

Wherein, will treat that the injection body is put into the mould of injection machine for the outer peripheral face of high-voltage coil still includes with at least one support auxiliary member butt that the mould inner wall set up: and putting the three winding bodies wound with the high-voltage coils into a mold as a body to be injected, and abutting the outer peripheral surface of each group of high-voltage coils with at least one supporting auxiliary part, so that the three groups of high-voltage coils and the three winding bodies are integrally coated by the high-temperature vulcanized silicone rubber, and the three-phase integrally-formed high-voltage winding is obtained.

In order to achieve the above purpose, another technical solution adopted by the present application is: a high-voltage winding is manufactured by any one of the high-voltage winding manufacturing methods.

The beneficial effect of this application is: be different from the condition of prior art, the high voltage winding of the dry-type transformer of this application includes bobbin, high-voltage coil and high temperature vulcanized silicone rubber's high voltage insulation layer, compares the epoxy high voltage insulation layer among the prior art, and this application high temperature vulcanized silicone rubber's high voltage insulation layer possesses following advantage: 1) The dry-type transformer has better fireproof performance, low-temperature resistance, aging resistance and short-circuit resistance test capability, and can effectively prolong the service life of the dry-type transformer; 2) The copper coil is easy to strip from the silicon rubber, the recovery rate of the material is more than 99 percent, and the copper coil is more environment-friendly; 3) The silicon rubber elastomer can weaken partial discharge inducement caused by mechanical vibration and has an inhibiting effect on equipment discharge, and a product of the silicon rubber under the discharge action is non-conductive silicon dioxide, so that the continuous degradation of insulation can be effectively inhibited; 4) The running loss of the transformer can be reduced, and energy is saved; 5) The environment-friendly glass has better capability of resisting severe environment and can be installed indoors and outdoors.

Meanwhile, the silicone rubber is formed by integral high-temperature vulcanization injection molding, the process method enables the high-voltage insulating layer to be more stable, the mechanical property to be higher, the bonding performance with the high-voltage coil and the winding body to be better, and the service life of the high-voltage insulating layer can be effectively prolonged. Compared with liquid silicon rubber, the high-temperature vulcanized silicone rubber filler is uniformly dispersed, and the dry-type transformer cannot generate partial discharge due to filler agglomeration, so that the overall performance of the dry-type transformer is better.

In addition, this application supports the auxiliary member through setting up, can prevent that the wire from taking place offset in the injection process, effectively improves the quality stability of product.

Drawings

Fig. 1 is a front view of a dry-type transformer 10 according to an embodiment of the present application;

fig. 2 is a plan view of the dry type transformer 10 according to the embodiment of the present application;

fig. 3 is a front view of an assembled core 110 according to an embodiment of the present application;

FIG. 4 is an enlarged view at G of FIG. 2;

fig. 5 is a perspective view of a bobbin 1310 according to an embodiment of the present application;

FIG. 6 is a cross-sectional view of a support barrel 1311 of an embodiment of the present application;

fig. 7 is a perspective view illustrating a high voltage coil 1320 of an embodiment of the present application wound around a bobbin 1310;

FIG. 8 is a schematic perspective view of the support aid 1340 of one embodiment of the subject application mounted on a mold 102;

fig. 9 is a perspective view of a high voltage winding preform prepared after installation of the support aid 1340 according to another embodiment of the present application;

FIG. 10 is an enlarged view at H in FIG. 9;

fig. 11 is a schematic perspective view of a high voltage winding 130 according to an embodiment of the present application;

fig. 12 is a perspective view of a tool attachment 101 according to an embodiment of the present application;

fig. 13 is a partial cross-sectional view of a high voltage winding 130 according to an embodiment of the present application.

Detailed Description

As required, detailed embodiments of the present application will be disclosed herein. However, it is to be understood that the disclosed embodiments are merely exemplary of the application and that they may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriately detailed manner, including employing various features disclosed herein in conjunction with features that may not be explicitly disclosed herein.

The terms "connected" and "connected" as used herein, unless otherwise expressly specified or limited, are to be construed broadly, as meaning either directly or through an intermediate. In the description of the present application, it is to be understood that the directions or positional relationships indicated by "upper", "lower", "end", "one end", etc. are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed in a specific direction and operate, and thus, should not be construed as limiting the present application.

As shown in fig. 1 to 3, the dry-type transformer 10 is a three-phase transformer, and the three phases are a phase, B phase and C phase, respectively, that is, the dry-type transformer 10 includes three single-phase transformers. According to the structure of the iron core 110, three single-phase transformers may be arranged to form a linear or triangular structure, and the three transformers are symmetrical. The dry-type transformer 10 may be an isolation transformer, a variable frequency transformer, a test transformer, or the like.

In one embodiment, with continued reference to fig. 1-3, three transformers are arranged to form a linear configuration, and 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, an upper iron yoke 112 located at upper ends of the three columnar iron core bodies 111, and a lower iron yoke 113 located at lower ends of the three columnar iron core bodies 111. The number of the low-voltage windings 120 is three, and the three low-voltage windings are respectively sleeved on the peripheries of the three columnar iron core bodies 111. The three high-voltage windings 130 are respectively sleeved on the peripheries of the three low-voltage windings 120, that is, the three columnar iron cores 111, the three low-voltage windings 120 and the three high-voltage windings 130 are sequentially sleeved one by one from inside to outside, so as to form the 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 the same direction. The columnar iron core body 111 is formed by overlapping multiple layers of silicon steel sheets, binding and fixing are carried out on the multiple layers of silicon steel sheets by using a binding belt, the radial section of the columnar iron core body 111 is roughly in an oval shape or a circular shape or other shapes as long as the columnar iron core body can be accommodated in a hollow cavity of the low-voltage winding 120, and limitation is not carried out here. The upper and

lower yokes

112 and 113 are also formed by stacking a plurality of silicon steel sheets, and the three columnar iron cores 111 are fixedly connected to form the iron core 110.

Illustratively, the present application provides a simple method of assembling the core 110, the low voltage winding 120, and the high voltage winding 130. The lower iron yoke 113 of the iron core 110 is firstly formed by overlapping multiple layers of silicon steel sheets and is arranged at the bottom of the dry-type transformer 10, then multiple layers of silicon steel sheets are respectively inserted at two ends and the middle part of the lower iron yoke 113 to form three columnar iron core bodies 111, then the low-voltage winding 120 and the high-voltage winding 130 are sequentially sleeved outside the columnar iron core bodies 111, and finally multiple layers of silicon steel sheets are horizontally inserted at the upper ends of the three columnar iron core bodies 111 to form the upper iron yoke 112, so that the assembly of the iron core 110, the low-voltage winding 120 and the high-voltage winding 130 is completed.

As shown in fig. 1 and 2, a core clip 140 is disposed on an outer side of the core 110, and the core clip 140 is used for clamping the core 110. The core clamp 140 may be a channel steel member or a hollow pipe member, and is not limited herein. The number of the iron core clamping pieces 140 is four, wherein two iron core clamping pieces 140 are symmetrically positioned at two sides of the upper end of the iron core 110; the other two core clamps 140 are symmetrically located at both sides of the lower end of the core 110.

As shown in fig. 2 and 4, the low voltage winding 120 includes a copper foil 121, a low voltage insulation layer 122, and a support bar 123, and the copper foil 121 and the low voltage insulation layer 122 are alternately disposed. The copper foil 121 is wound by the whole piece of copper foil paper, and the low-voltage insulating layer 122 and the copper foil 121 are overlapped and then wound together, so that the copper foil 121 and the low-voltage insulating layer 122 are alternately arranged.

At least one heat dissipation air channel is arranged in the low-voltage winding 120 and located between the adjacent copper foil 121 and the low-voltage insulating layer 122, and a support bar 123 is located in the heat dissipation air channel and used for supporting and isolating the adjacent copper foil 121 and the low-voltage insulating layer 122.

The low-voltage insulating layer 122 is made of polyimide impregnated paper, specifically SHS-P diphenyl ether prepreg, which is prepared by impregnating a polyimide film and polysulfone fiber non-woven fabric soft composite material with diphenyl ether resin and then baking, and may be made of DMD insulated paper or silicone rubber film, or other insulated materials, and is selected according to different temperature rise grades of the dry-type transformer.

The insulating support bars 123 are made of glass fiber-impregnated epoxy resin or aramid fiber-impregnated epoxy resin, which is not limited herein. In addition, the insulating support bar 123 is a long bar with an i-shaped cross section, so that the mechanical strength is more stable. Of course, the insulating support bar may also be a long bar with a square cross section or other shapes, as long as the function of supporting and isolating is achieved.

As shown in fig. 5-13, the high voltage winding 130 includes a bobbin 1310, a high voltage coil 1320, and a high voltage insulation layer 1330, with a wire wound around the bobbin 1310 to form the high voltage coil 1320. The winding body 1310 comprises a supporting cylinder 1311 and a winding part 1312, wherein the supporting cylinder 1311 is a hollow cylinder, and can be a hollow cylinder, a hollow elliptic cylinder or other hollow cylinders; the winding portion 1312 is located on an outer circumferential surface of the support tube 1311, a wire is wound in the winding portion 1312 to form a high voltage coil 1320, and the high voltage coil 1320 includes a plurality of segments of coils arranged at intervals in an axial direction of the support tube 1311. The axial direction of the winding 1310 is the same direction as the axial direction of the high voltage winding 130.

The winding portion 1312 includes a plurality of winding plates 1313, the plurality of winding plates 1313 being circumferentially distributed on the outer circumferential surface of the supporting cylinder 1311, each of the winding plates 1313 being disposed along the axial direction of the supporting cylinder 1311, and the length of the winding plate 1313 along the axial direction of the supporting cylinder 1311 being smaller than the length of the supporting cylinder 1311 along the axial direction thereof. The number of the winding boards 1313 is at least two, that is, two, three, four or more, which is not limited herein. In order to make the winding of the wire reliable and save material as much as possible, the number of the winding plates 1313 of the 10kV/1000kVA dry type transformer is twelve.

The winding board 1313 is a rectangular board, the longer side of the winding board 1313 is disposed along the axial direction of the supporting cylinder 1311, a plurality of winding slots 1314 are further disposed on the winding board 1313, the plurality of winding slots 1314 are disposed along the radial direction of the supporting cylinder 1311 and are distributed along the axial direction of the supporting cylinder 1311 at intervals, so that the winding board 1313 is in a comb shape, that is, a plurality of comb teeth are formed on the winding board 1313. The height of the comb teeth on the winding board 1313 along the axial direction of the support cylinder 1311 is defined as the tooth height, the tooth height of the comb teeth at the two ends of the winding board 1313 and the tooth height of the comb teeth in the middle of the winding board 1313 are both greater than those of the comb teeth at the other parts, because the field intensity at the end part of the high-voltage coil 1320 is not uniform, the tooth heights at the two ends of the winding board 1313 are set to be larger than those of the comb teeth at the other parts, a tap of a branch line needs to be led out from the middle of the winding board 1313, the tooth height in the middle of the winding board 1313 is set to be larger than that of the high-voltage coil 1320, the distance between the two corresponding adjacent winding slots 1314 is larger, and a placement space can be reserved for the tap led out from the middle of the winding board 1313.

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

The plurality of winding plates 1313 are uniformly distributed on the outer circumferential surface of the supporting cylinder 1311 in the circumferential direction, two ends of all the winding plates 1313 are arranged in a flush mode, the winding grooves 1314 in all the winding plates 1313 are matched in the circumferential direction of the supporting cylinder 1311 in a one-to-one correspondence mode, each section of coil is wound in one corresponding winding groove 1314 on all the winding plates 1313 along the circumferential direction of the supporting cylinder 1311 through a conducting wire, stress is balanced, and mechanical strength is good.

In other embodiments, the wire wrap plate may also be an annular disc circumferentially disposed about the support cylinder. The plurality of winding plates are arranged at intervals along the axial direction of the supporting cylinder, and the conducting wire is wound in the groove formed by the two adjacent winding plates. For example, the winding body can be formed by integrally injecting high-temperature vulcanized silicone rubber, a plurality of annular winding grooves are formed in the outer peripheral surface of the winding body, the winding grooves are arranged along the axial direction of the winding body at intervals, winding teeth are formed between every two adjacent winding grooves, a wire is wound in the winding grooves to form a high-voltage coil, the high-voltage coil comprises a plurality of sections of coils, and the plurality of sections of coils are arranged along the axial direction of the winding body at intervals. The winding body adopts high-temperature vulcanized silicone rubber, and through whole vacuum injection technology one shot forming, forms a plurality of annular wire winding grooves simultaneously, makes the whole preparation time of high-voltage winding shorten, and production efficiency is high, in addition, because winding body and high-pressure insulating layer all adopt the same material, can avoid the electric field distribution between the winding body of different materials and the high-pressure insulating layer inhomogeneous. The integral vacuum injection process is to inject the silicon rubber raw material in vacuum state to form high temperature silicon sulfide rubber.

With reference to fig. 6, the supporting cylinder 1311 is a hollow pipe formed by winding, curing or pultrusion a glass fiber-impregnated epoxy resin, a hollow pipe formed by winding, curing or pultrusion an aramid fiber-impregnated epoxy resin, or a hollow pipe made of other composite materials, which is not limited herein.

The winding 1310 may be formed by separately molding the supporting cylinder 1311 and the winding board 1313 and then adhering them together, or may be formed by integrally molding a hollow pipe member by one-time casting and then turning the hollow pipe member to form a supporting cylinder and a comb-shaped winding board.

In an application scenario, as shown in fig. 5 and 6, the winding body 1310 further includes two flanges 1315, the flanges 1315 are located at two ends of the supporting cylinder 1311 and extend outward in a radial direction of the supporting cylinder 1311 to form an annular disc surface, the flanges 1315 at the two ends are disposed opposite to each other, when the winding board 1313 is disposed on an outer circumferential surface of the winding body 1310, outer end surfaces of the two ends of the winding board 1313 abut against the disc surface of the two flanges 1315 facing each other, and the winding board 1313 is prevented from being damaged due to a large injection pressure during the injection of the high-voltage insulating layer 1330. And in the radial direction of the bobbin 1310, that is, in the radial direction of the supporting cylinder 1311, the width of the two flanges 1315 is equal to or slightly less than the width of the high voltage coil 1320, so as to ensure that the supporting auxiliary member 1340 can smoothly abut against the outer circumferential surface of the high voltage coil 1320 after being installed. The width of the flange 1315 is the distance that the flange 1315 extends outwards from the outer wall of the support barrel 1311 along the radial direction of the support barrel 1311, that is, the distance that the flange 1315 protrudes out of the outer wall of the support barrel 1311; the width of the high voltage coil 1320 is the loop width of the high voltage coil 1320.

In other embodiments, the winding body may include only the winding portion, the rigid insulation lining cylinder, that is, the support cylinder is not provided, the winding portion is circumferentially provided on the inner side of the high-voltage winding, the conducting wire is wound on the outer side of the winding portion to form the high-voltage coil, and the high-voltage insulation layer wraps the high-voltage coil and the winding portion. The high-voltage winding omits a structure of a rigid insulating lining cylinder, so that the heat conduction effect is better, an interface between the high-voltage insulating layer and the rigid insulating lining cylinder is eliminated, the surface discharge of the rigid insulating lining cylinder is inhibited, the material is saved, and the cost is reduced.

The winding body 1310 is made of the fiber reinforced composite material, has the characteristics of light weight and high strength, so that the winding body 1310 has better mechanical strength, can effectively support the winding of a lead, is not easy to damage, and avoids the lead from being scattered and displaced by the injection impact force generated when high-temperature vulcanized silicone rubber is injected outside the winding body 1310; and the fiber reinforced composite material has good heat resistance, and prevents the deformation of the winding 1310 caused by the excessive heat generated by the high-voltage coil 1320 during the operation of the dry-type transformer 10.

As shown in fig. 5 and 7, a wire is circumferentially wound around the outer circumferential surface 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, and is wound into the winding groove 1314 at the other end of the winding body 1310 through the winding groove 1314 at one end of the winding body 1310, so that the high-voltage coils 1320 are distributed at intervals in the axial direction of the supporting cylinder 1311, and the wire forms two external connections at the head and tail ends after the winding is completed, namely a first external connection D and a second external connection X, wherein the first external connection D is used for connecting a cable, and the second external connection X is used for connecting other external connections, for example, in a three-phase transformer, for connecting with each phase transformer. The conductive wire is led out at the middle of the bobbin 1310 in the axial direction thereof with six taps, respectively, tap 2, tap 3, tap 4, tap 5, tap 6, and tap 7, the six taps forming a tap changer, and for convenience of description, tap 2, tap 4, and tap 6 are defined as a first tap changer, and tap 3, tap 5, and tap 7 are defined as a second tap changer.

When the conducting wire is wound, the conducting wire is wound in the corresponding winding grooves 1314 on all the winding plates 1313, so that each section of coil formed by winding the conducting wire is perpendicular to the axial direction of the supporting cylinder 1311, the winding is convenient, the conducting wire is arranged neatly, the stress of the winding plates 1313 and the supporting cylinder 1311 is uniform, and the mechanical strength is good.

Referring to fig. 13, which is a partial cross-sectional view of the high-voltage winding 130 coated with the high-voltage insulating layer 1330 cut along the axial direction thereof, the wire is wound in the comb-shaped winding plate 1313 by the aforementioned winding method to form the pie high-voltage coil 1320, and the pie high-voltage coil 1320 and the comb teeth of the winding plate 1313 are arranged at an interval along the axial direction of the high-voltage winding 130, that is, a pie coil is arranged between two adjacent comb teeth. The coil structure has better mechanical strength, strong bearing capacity for the electric power generated by short-circuit current, more cakes and better heat dissipation capacity compared with a layer coil.

In the axial direction of the supporting cylinder 1311, as shown in fig. 11, the tap 6, the tap 4, and the tap 2 are sequentially distributed to form a first tap changer, the tap 3, the tap 5, and the tap 7 are sequentially distributed to form a second tap changer, the first tap changer and the second tap changer are arranged in parallel, and six taps form tapping devices of the high voltage coil 1320, which are used for the dry type transformer 10 to adjust voltage according to different operating conditions.

In this embodiment, the tap changer includes six taps, and the dry-type transformer 10 has five adjustable voltage levels, in other embodiments, the tap changer may also include four taps, that is, the first tap changer and the second tap changer include two taps, and the dry-type transformer includes three adjustable voltage levels, as long as the actual use requirements of the dry-type transformer are met, which is not limited herein.

Referring to fig. 7-11, a high voltage insulation 1330 wraps the high voltage coil 1320 and the bobbin 1310 to form the high voltage winding 130. The high voltage insulation layer 1330 is made of high temperature vulcanized silicone rubber, which improves the insulation and mechanical properties of the high voltage winding 130 as a whole. Specifically, a conducting wire is wound on a winding body 1310 to form a high-voltage coil 1320, the winding body 1310 and the high-voltage coil 1320 are used as a body to be injected, the body to be injected is placed in a mold 102 of an injection machine (fig. 8 schematically shows a partial structure diagram of the mold 102), and a high-temperature vulcanized silicone rubber is injected on the whole periphery of the body to be injected by adding a silicone rubber raw material, so that the high-voltage winding preform shown in fig. 9 is obtained.

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

The supporting auxiliary member 1340 is a long strip and is detachably and fixedly connected to the inner wall of the mold 102, specifically, both ends of the supporting auxiliary member 1340 are provided with threaded holes, the mold 102 is also provided with threaded holes along the corresponding axial positions of the mold, and the mold 102 and the supporting auxiliary member 1340 can be assembled by inserting fasteners such as screws into the threaded holes corresponding to each other on the mold 102 and the supporting auxiliary member 1340. The supporting auxiliary member 1340 is detachably connected with the mold 102, so that the mold 102 can also be suitable for preparing a high-voltage winding without the supporting auxiliary member, the application range is wider, and the manufacturing cost is effectively reduced. The length of the supporting auxiliary member 1340 is equal to the axial length of the cavity of the mold 102, that is, the length of the supporting auxiliary member 1340 is equal to the axial length of the high-voltage winding 130 and slightly greater than the axial length of the high-voltage coil 1320, so that after the supporting auxiliary member 1340 is installed in the axial direction of the mold 102, the supporting auxiliary member 1340 can abut against the entire outer circumferential surface of the high-voltage coil 1320 in the axial direction of the winding body 1310, thereby ensuring that each segment of the high-voltage coil 1320 in the axial direction of the winding body 1310 can be protected.

In other embodiments, the supporting auxiliary member may be disposed at a certain angle with respect to the winding body, and the supporting auxiliary member may also be fixedly connected to the mold by welding, clamping, or other connection methods, as long as the supporting auxiliary member can be reliably connected to the mold, which is not limited herein.

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 symmetrically abutted to two sides of the high-voltage coil 1320, so that the force applied to the high-voltage coil 1320 by the two supporting auxiliary members 1340 is more uniform and stable, and the wire is further prevented from being displaced due to uneven stress. Of course, in other embodiments, three, four or more support auxiliary members may be provided, and the plurality of support auxiliary members are uniformly distributed in the circumferential direction of the mold, as long as the support auxiliary members can be brought into contact with the outer circumferential surface of the high-voltage coil to prevent the lead from being displaced, and the support auxiliary members are not particularly limited herein.

In this embodiment, the supporting auxiliary member 1340 is made of mold steel, has high mechanical strength, can resist pressure during the injection of the high-temperature vulcanized silicone rubber, and can be repeatedly used. In other embodiments, the supporting auxiliary member may be made of other metal materials, and is not limited herein.

In this embodiment, the supporting auxiliary member 1340 is a long strip with a rectangular cross section, that is, the supporting auxiliary member 1340 is a rectangular parallelepiped structure, and in other embodiments, the supporting auxiliary member may also be a long strip with a triangular, pentagonal or other cross section, as long as the surface of the supporting auxiliary member contacting the high-voltage coil is a plane, which is not limited herein.

In other embodiments, the supporting auxiliary member may also be in a short column shape, and specifically, the supporting auxiliary member 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 are all abutted against the outer peripheral surface of the high-voltage coil. Preferably, the short columns of the supporting auxiliary parts are uniformly distributed along the axial direction of the mold and are fixedly connected with the mold, and the supporting auxiliary parts are uniformly distributed along the circumferential direction of the mold to further fix the wires, so that the purpose of preventing the wires from shifting is achieved. In the axial direction of the winding body, the distance between the end faces, far away from each other, of the two short cylinders farthest away from each other in the supporting auxiliary part is the total length of the supporting auxiliary part, the total length is equal to the axial length of the inner cavity of the die, namely the axial length of the short cylinders is equal to that of the high-voltage winding and slightly greater than that of the high-voltage winding, so that the short cylinders can be evenly abutted to the outer peripheral surface of the high-voltage winding, and all sections of the high-voltage winding in the axial direction of the winding body can be protected.

Further, since the inner wall of the mold 102 is provided with the supporting auxiliary member 1340, after the high temperature vulcanized silicone rubber is injected integrally on the periphery of the body to be injected, the high voltage winding preform with the groove 1341 on the surface is obtained through demolding as shown in fig. 9. After the high-voltage winding prefabricated part is cooled, the groove 1341 needs to be filled so that high-temperature vulcanized silicone rubber is continuous at the groove 1341, namely, silicone rubber mixed rubber is filled in the groove 1341, the groove 1341 is filled with the silicone rubber mixed rubber, then a repairing mold is arranged on the surface of the groove 1341 filled with the silicone rubber mixed rubber to heat and pressurize the silicone rubber mixed rubber, the inner surface of the repairing mold is tightly attached to the outer surface of the high-voltage winding prefabricated part, the high-voltage winding prefabricated part is repaired by the temperature and the pressure required by the high-temperature vulcanized silicone rubber molding provided by the repairing mold, the silicone rubber mixed rubber in the groove 1341 is tightly adhered to the original high-temperature vulcanized silicone rubber of the high-voltage winding prefabricated part, finally, the repairing mold is removed, the surface of the repairing part is treated, the high-temperature vulcanized silicone rubber is continuous at the groove 1341, and the high-surface-completed high-voltage winding 130 can be obtained.

In the radial direction of the winding 1310, the distance between the outer surface of the high voltage insulation layer 1330 and the outer surface of the high voltage coil 1320 corresponding thereto is defined as the thickness of the high voltage insulation layer 1330, and the thickness of the high voltage insulation layer 1330 is equal at any position of the high voltage winding 130, so that the cross-sectional shape of the high voltage winding 130 is similar to the cross-sectional shape of the supporting cylinder 1311, i.e., the high voltage winding 130 is a hollow cylinder, an elliptical cylinder, or other hollow cylinder as a whole, thereby the center of gravity of the high voltage winding 130 is approximately consistent with the center of gravity of the winding 1310.

In an application scene, the high-voltage winding can also be a three-phase integrated structure, namely the high-voltage winding comprises three winding bodies, three groups of high-voltage coils and a high-voltage insulating layer, the three winding bodies are respectively wound with wires to form the three groups of high-voltage coils, and the three winding bodies wound with the high-voltage coils are in a linear symmetrical structure. The high-voltage insulation layer integrally fills gaps between the three winding bodies and the three groups of high-voltage coils and covers two ends of the three winding bodies, specifically, each phase of high-voltage winding comprises one winding body and one group of high-voltage coils, the high-voltage insulation layer fills gaps between the winding body and the high-voltage coils on each phase of high-voltage winding and gaps between the three groups of high-voltage coils, and meanwhile, the high-voltage insulation layer also covers two ends of the three winding bodies and the peripheries of the three groups of high-voltage coils, so that the three-phase high-voltage winding is integrally formed. So, compare fashioned high voltage winding of components of a whole that can function independently, can avoid the asynchronous high voltage winding fracture problem that causes of split type high voltage winding's three-phase vibrations to and make the insulation distance between each looks high voltage winding shorten, reduced the silicon steel sheet quantity of upper yoke and lower yoke, and then reduce the bulk volume of iron core, thereby reduce high voltage winding's no-load loss.

After the high-voltage coil 1320 and the winding 1310 are coated by the integral vacuum injection high-temperature vulcanized silicone rubber, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the winding 1310 and coats the two ends of the winding 1310, and the inner wall of the supporting cylinder 1311 is not coated by the high-temperature vulcanized silicone rubber, so that the high-voltage winding 130 is integrally in a hollow column shape, can be a hollow cylinder, can also be a hollow elliptic cylinder, or other hollow columns.

Before the high-temperature vulcanized silicone rubber is integrally injected, the six taps are connected by arranging the tool connecting piece 101, so that the problem that the six taps cannot be used for wiring due to the fact that the six taps are also coated by the silicone rubber in the injection process is avoided. As shown in fig. 9, the tooling connecting part 101 is an aluminum alloy plate, a protection cavity is arranged on the plate surface of the tooling connecting part 101, the protection cavity is six identical step holes 1011, and threads are further arranged on the inner walls of the step holes 1011. The six step holes 1011 are arranged in two parallel rows, and three step holes 1011 are arranged in each row, so that the first tapping switch and the second tapping switch are also arranged in parallel. Simultaneously, before whole injection, six taps are connected to six step holes 1011 respectively after, all connect the bolt in six step holes 1011, so, the bolt can directly fill step hole 1011 residual space, prevents that six step holes 1011 are filled to the silicon rubber to can't be used for the wiring after avoiding six taps to be wrapped by the silicon rubber.

In another embodiment, with reference to fig. 1-13, a method for preparing a high voltage winding 130 is provided, comprising the steps of:

step (1): the wire is wound circumferentially along the outer circumferential surface of the winding body 1310 to form a high voltage coil 1320, and a tap is formed during the winding process of the wire.

First, a bobbin 1310 is prepared, and flanges 1315 are provided at both ends of the bobbin 1310. Specifically, the winding body 1310 includes a supporting cylinder 1311 and a winding portion 1312 located on an outer circumferential surface of the supporting cylinder 1311, and the specific structures, materials, and molding methods of the supporting cylinder 1311 and the winding board 1313 and the connection manner between the supporting cylinder 1311 and the winding board 1313 are as described above and will not be described again. The winding body 1310 further comprises two flanges 1315, the flanges 1315 are located at two ends of the supporting cylinder 1311, and extend outwards from the outer wall of the supporting cylinder 1311 along the radial direction of the supporting cylinder 1311 to form a circular disc surface, the flanges 1315 at the two ends are oppositely arranged, and the width of the two flanges 1315 is equal to or slightly smaller than the width of the high-voltage coil 1320 in the radial direction of the winding body 1310, that is, in the radial direction of the supporting cylinder 1311, so as to ensure that the supporting auxiliary piece 1340 can smoothly abut against the outer peripheral surface of the high-voltage coil 1320 after being installed.

Next, the winding body 1310 is fitted on a winding apparatus, and a high voltage coil 1320 is formed by winding a wire around the winding body 1310, such that the high voltage coil 1320 is arranged at intervals in the axial direction of the support cylinder 1311, thereby forming a pancake type high voltage coil 1320. The wire winding method and the structure of the high voltage coil 1320 are the same as those described above, and will not be described again.

During the winding process, the wires respectively lead out of the tap 2, the tap 3, the tap 4, the tap 5, the tap 6 and the tap 7, so that a tap changer is formed. In other embodiments, the tap changer may include only four taps, which is not limited herein.

In another application scenario, the winding body can also be made of high-temperature vulcanized silicone rubber, and the winding body is integrally formed by vacuum injection molding through designing a winding body injection mold and putting the winding body injection mold into an injection machine, adding a silicone rubber raw material, and heating and pressurizing. In the high-temperature vulcanized silicone rubber forming process, a plurality of annular winding grooves are formed in the outer peripheral surface of the winding body, the winding grooves are arranged at intervals along the axial direction of the winding body, and winding teeth are formed between every two adjacent winding grooves, so that the winding of the wire in the two adjacent winding grooves in the outer peripheral surface of the winding body is firmer, and the wire can be supported in a balanced manner.

Step (2): and placing the tap in the protection cavity of the tool connecting piece 101 and connecting and fixing the tap with the tool connecting piece 101 to obtain the body to be injected.

Through the tool connecting part 101 shown in fig. 12, six taps are respectively connected and fixed to the protection cavity of the tool connecting part 101, in this application, the protection cavity is six step holes 1011, and may be connected by welding or may be fixedly connected by other methods, which is not limited herein.

And (3): the body to be injected is placed into the mold 102 of the injection machine such that the outer circumferential surface of the high voltage coil 1320 abuts at least one support aid 1340 provided on the inner wall of the mold 102.

Before the step, bolts are connected in the six step holes 1011 of the tool connecting piece 101, so that the bolts can directly fill the residual space of the step holes 1011, the six step holes 1011 are prevented from being filled with silicon rubber, and the situation that the six taps cannot be used for wiring after being coated with the silicon rubber can be avoided.

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 connecting piece 101 are used as a body to be injected, then after the periphery of the body to be injected is coated with a coupling agent, the body to be injected is placed into the mold 102, so that the supporting auxiliary piece 1340 is abutted against the peripheral surface of the high-voltage coil 1320, the wire is further fixed, and the purpose of preventing the wire from shifting is achieved.

The supporting auxiliary pieces 1340 are long strips or short columns, a plurality of supporting auxiliary pieces 1340 are arranged, and the supporting auxiliary pieces 1340 are detachably and fixedly connected to the inner wall of the mold 102 of the injection machine along the axial direction of the mold 102, so that the supporting auxiliary pieces 1340 are uniformly distributed in the circumferential direction of the mold. The specific structure and material of the supporting auxiliary member 1340 and the fixing manner of the supporting auxiliary member 1340 and the mold 102 are as described above, and are not described again.

In the radial direction of the supporting cylinder 1311, the widths of the two flanges 1315 are equal to or slightly smaller than the width of the high-voltage coil 1320, and after the supporting auxiliary piece 1340 is mounted on the mold 102, the flanges 1315 do not prevent the supporting auxiliary piece 1340 from abutting against the outer peripheral surface of the high-voltage coil 1320, so that the purpose of preventing the wire from being displaced is achieved. 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, two ends of the supporting auxiliary piece 1340 fixed on the mold 102 will abut against the outer side surfaces of the two flanges 1315, respectively, so that the supporting auxiliary piece 1340 cannot abut against the outer peripheral surface of the high-voltage coil 1320; if the width of the burring 1325 is too small, the mechanical strength thereof is significantly reduced, and it is impossible to prevent the winding board 1313 from being damaged due to a large injection pressure during the injection of the high-pressure insulation 1330.

And (4): and injecting and forming high-temperature vulcanized silicone rubber at the periphery of the body to be injected to obtain the high-voltage winding prefabricated part with the groove 1341 on the surface.

Adding silicon rubber raw materials, integrally injecting the silicon rubber raw materials at the periphery of the body to be injected to form high-temperature vulcanized silicon rubber, so that the high-temperature vulcanized silicon rubber coats the high-voltage coil 1320 and the winding body 1310, and obtaining the high-voltage winding prefabricated part with the groove 1341 on the surface as shown in fig. 9 after demoulding.

In another application scenario, a high-temperature vulcanized silicone rubber is adopted to prepare a winding body before the step, the high-temperature vulcanized silicone rubber winding body wound with the high-voltage coil is used as a body to be injected and is placed into a mold of an injection machine, the peripheral surface of the high-voltage coil is abutted to at least one supporting auxiliary piece fixed on the inner wall of the mold, and the lead is further fixed, so that the purpose of preventing the lead from moving is achieved. And then injecting high-temperature vulcanized silicone rubber at the periphery of the body to be injected to obtain the high-voltage winding prefabricated part with the groove on the surface.

And (5): the grooves 1341 of the high voltage winding preform are filled such that the high temperature vulcanized silicone rubber is continuous at the grooves 1341.

After the high-voltage winding prefabricated part is cooled, silicon rubber compound is filled in the groove 1341, the groove 1341 is filled with the silicon rubber compound, a repairing mold is arranged on the surface of the groove 1341 filled with the silicon rubber compound to heat and pressurize the silicon rubber compound, the inner surface of the repairing mold is tightly attached to the outer surface of the high-voltage winding prefabricated part, the high-voltage winding prefabricated part is repaired by the temperature and the pressure required by high-temperature vulcanized silicon rubber provided by the repairing mold for forming, the silicon rubber compound in the groove 1341 is tightly adhered to the original high-temperature vulcanized silicon rubber of the high-voltage winding prefabricated part, finally the repairing mold is removed, the surface of the repaired part is treated, the high-temperature vulcanized silicon rubber is continuous in the groove 1341, and the high-voltage winding 130 with a complete surface is obtained.

In the present embodiment, the surface treatment of the repaired site includes: firstly, a knife or other tools are used for cutting off redundant sizing materials at the repaired position, namely, the sizing materials protruding out of the outer surface of the high-voltage winding prefabricated part at the repaired position are cut off, so that the thicknesses of the high-voltage insulating layers 1330 at any position of the high-voltage winding 130 are equal; then, polishing the repaired part smoothly by using sand paper; finally, wiping the surface of the repaired part clean by adopting alcohol. In other embodiments, other types of surface treatments may be used, as long as the surface of the repaired area can be treated to be smooth and clean, and the method is not limited herein.

After the high-temperature vulcanized silicone rubber is integrally vacuum-injected to cover the high-voltage coil 1320 and the bobbin 1310, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the bobbin 1310 and the two ends of the bobbin 1310, and the high-temperature vulcanized silicone rubber does not cover the inner wall of the supporting cylinder 1311, so that the high-voltage winding 130 is integrally in a hollow cylindrical shape, which may be a hollow cylinder, a hollow elliptic cylinder, or other hollow cylindrical bodies.

And (6): the tooling connection 101 is removed resulting in the high voltage winding 130 with the taps exposed to the high temperature silicon sulfide rubber.

After the high voltage insulation layer 1330 is formed by vacuum injection, the side surface of the tooling connection piece 101 is coated with a small amount of silicon rubber, and the silicon rubber coated on the tooling connection piece 101 is smaller, so that the tooling connection piece 101 can be directly detached by a tool to expose the tap, and finally the high voltage winding 130 shown in fig. 11 is formed.

After the high-temperature vulcanized silicone rubber is coated on the high-voltage coil 1320 and the winding body 1310 through integral vacuum injection, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the winding body 1310 and the two ends of the winding body 1310, and the high-temperature vulcanized silicone rubber does not coat the inner wall of the supporting cylinder 1311, so that the high-voltage winding 130 is integrally hollow cylindrical, can be a hollow cylinder, can also be a hollow elliptic cylinder, or other hollow cylindrical bodies.

In another application scenario, the tooling connection part may 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 is filled in the groove of the high-voltage winding preform, that is, the sequence of step (5) and step (6) may be exchanged, as long as the high-temperature vulcanized silicone rubber is continuous at the groove 1341 to obtain the high-voltage winding 130 with a complete surface, which is not limited herein.

In another application scenario, a three-phase integral forming process can be adopted to prepare the high-voltage winding. The method comprises the steps of firstly preparing three winding bodies, respectively winding a conducting wire in the circumferential direction along the peripheral surfaces of the three winding bodies to form three groups of high-voltage coils, respectively forming a tapping switch on the conducting wire on each group of high-voltage coils in the winding process, wherein each tapping switch comprises a plurality of tapping joints to form three groups of high-voltage coils and three tapping switches. Secondly, the three tap switches are respectively arranged in the protection cavity of the tool connecting piece and are fixedly connected with the tool connecting piece. Then, set up at least three support auxiliary member at the mould inner wall of injection machine, the outer peripheral face of every group high-voltage coil promptly with at least one support the auxiliary member butt, for example set up threely, be the symmetry with three winding bodies that have been twined high-voltage coil and arrange and put into the mould as treating the injection body for the outer peripheral face of three groups high-voltage coil corresponds the butt with the fixed three support auxiliary member of mould inner wall respectively, further fixed wire, thereby reaches the purpose that prevents the wire aversion. And then adding a silicon rubber raw material, injecting high-temperature vulcanized silicon rubber at the periphery of the body to be injected, so that the high-temperature vulcanized silicon rubber integrally covers three groups of high-voltage coils and three wire windings, specifically, each phase of high-voltage winding comprises one wire winding body and one group of high-voltage coils, a high-voltage insulating layer fills gaps between the wire winding body and the high-voltage coils on each phase of high-voltage winding and gaps between the three groups of high-voltage coils, meanwhile, the high-voltage insulating layer also covers two ends of the three wire windings and the peripheries of the three groups of high-voltage coils, so that a high-voltage winding prefabricated part with a groove on the surface is obtained after demolding, then filling silicon rubber compound in the groove of the high-voltage winding prefabricated part, and heating and pressurizing the high-temperature vulcanized silicon rubber to be continuous in the groove, so that the high-voltage winding with a complete surface is obtained. And finally, removing the tooling connecting piece to obtain the high-voltage winding of which the tap is exposed outside the high-temperature vulcanized silicone rubber.

The beneficial effect of this application is: be different from prior art's condition, the high-voltage winding of the dry-type transformer of this application includes bobbin, high-voltage coil and high temperature silicon sulfide rubber's high-pressure insulation layer, compares the epoxy high-pressure insulation layer among the prior art, and the high-pressure insulation layer of this application high temperature silicon sulfide rubber possesses following advantage: 1) The dry-type transformer has better fireproof performance, low-temperature resistance, aging resistance and short-circuit resistance test capability, and can effectively prolong the service life of the dry-type transformer; 2) The copper coil is easy to strip from the silicon rubber, the recovery rate of the material is more than 99 percent, and the copper coil is more environment-friendly; 3) The silicon rubber elastomer can weaken partial discharge inducement caused by mechanical vibration and has an inhibiting effect on equipment discharge, and the product of the silicon rubber under the discharge action is non-conductive silicon dioxide, so that the continuous degradation of insulation can be effectively inhibited; 4) The running loss of the transformer can be reduced, and energy is saved; 5) The environment resistance is good, and the device can be installed indoors and outdoors.

Meanwhile, the silicone rubber is formed by integral high-temperature vulcanization injection molding, the process method enables the high-voltage insulating layer to be more stable, the mechanical property to be higher, the bonding performance with the high-voltage coil and the winding body to be better, and the service life of the high-voltage insulating layer can be effectively prolonged. Compared with liquid silicone rubber, the high-temperature vulcanized silicone rubber filler is uniformly dispersed, and the dry type transformer cannot generate partial discharge due to filler agglomeration, so that the overall performance of the dry type transformer is better.

While the specification and features of the present application have been described above, it will be understood that various changes and modifications in the above-described constructions and materials, including combinations of features disclosed herein either individually or in any combination, will be apparent to those skilled in the art upon studying the disclosure. Such modifications and/or combinations are within the skill of the art to which this application pertains and are within the scope of the claims of this application.

Claims

1. A preparation method of a high-voltage winding is characterized by comprising the following steps:

the conducting wire is wound along the peripheral surface of the winding body in the circumferential direction to form a high-voltage coil, and a tap is formed in the winding process of the conducting wire;

placing the tap in a protection cavity of a tool connecting piece and fixedly connecting the tap with the tool connecting piece to obtain a body to be injected;

putting the body to be injected into a mould of an injection machine, so that the peripheral surface of the high-voltage coil is abutted against at least one supporting auxiliary piece arranged on the inner wall of the mould;

injecting the high-temperature vulcanized silicone rubber at the periphery of the body to be injected to obtain a high-voltage winding prefabricated part with a groove on the surface;

filling the groove of the high-voltage winding prefabricated part so that the high-temperature vulcanized silicone rubber is continuous at the groove;

and removing the tooling connecting piece to obtain the high-voltage winding exposed outside the high-temperature vulcanized silicone rubber by the tap.

2. The method of claim 1, wherein the wire is wound circumferentially around the outer circumference of the winding body to form a high voltage coil, and wherein the step of winding the wire to form the tap comprises: and flanges are arranged at two ends of the winding body, and the width of the flanges is equal to or slightly smaller than that of the high-voltage coil in the radial direction of the winding body.

3. The method according to claim 1, wherein the placing the body to be injected into a mold of an injection machine so that the outer peripheral surface of the high-voltage coil abuts against at least one support aid provided to the inner wall of the mold comprises:

and fixedly connecting the supporting auxiliary member to the inner wall of the mold in a detachable way along the axial direction of the mold.

4. The method according to claim 1, wherein the placing the body to be injected into a mold of an injection machine so that the outer peripheral surface of the high-voltage coil abuts against at least one support aid provided to the inner wall of the mold comprises:

the supporting auxiliary member is in a shape of a long strip or a short column.

5. The manufacturing method according to claim 1, wherein the placing the body to be injected into a mold of an injection machine so that the outer peripheral surface of the high-voltage coil abuts against at least one support auxiliary provided on the inner wall of the mold further comprises:

and arranging a plurality of supporting auxiliary pieces, so that the plurality of supporting auxiliary pieces are uniformly distributed in the circumferential direction of the die.

6. The method of manufacturing according to claim 1, wherein said filling the groove of the high-voltage winding preform so that the high-temperature vulcanized silicone rubber continues at the groove comprises:

filling silicon rubber compound into the groove; and arranging a repairing mould on the surface of the groove to heat and pressurize the silicon rubber compound.

7. The method according to claim 6, wherein the step of providing the repair mold on the surface of the groove, after the step of applying heat and pressure to the silicone rubber compound, comprises:

and removing the repairing mould, and carrying out surface treatment on the repaired part of the high-voltage winding.

8. The method of claim 7, wherein the surface treating the repair of the high voltage winding comprises:

cutting off the sizing material protruding out of the outer surface of the high-voltage winding prefabricated part at the repaired position; polishing the repaired part smoothly; and wiping the surface of the repaired position clean.

9. The manufacturing method according to claim 1, wherein the placing the body to be injected into a mold of an injection machine so that the outer peripheral surface of the high-voltage coil abuts against at least one support auxiliary provided on the inner wall of the mold further comprises:

and putting the three winding bodies wound with the high-voltage coils into the mold as a body to be injected, wherein the peripheral surface of each group of high-voltage coils is abutted against at least one supporting auxiliary part, so that the high-temperature vulcanized silicone rubber integrally coats the three groups of high-voltage coils and the three winding bodies.

10. A high-voltage winding, characterized in that it is manufactured by a method for manufacturing a high-voltage winding according to any of claims 1-9.