CN218525430U - Winding body of high-voltage winding and high-voltage winding - Google Patents

Abstract

The application discloses high-voltage winding's bobbin, including a supporting cylinder and the portion of winding that is located supporting cylinder peripheral face, the bobbin adopts fibre reinforced composite to make. The application also discloses a high-voltage winding, which comprises the winding body. The utility model provides a winding body can make the wire coiling more firm, and the high-voltage coil structure of formation has better mechanical strength, and the heat-sinking capability is better, and anti short circuit impact ability is also better.

Description

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

Technical Field

The application relates to the technical field of power transformers, in particular to a winding body 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 no oil, fire resistance, long service life, energy conservation, 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 recent 10 years, there still exist problems of insulation cracking, poor heat conduction, severe operating environment, and the like during operation.

Particularly, in the structure of the high-voltage winding of the dry-type transformer, when a lead in the current high-voltage winding is wound, the high-voltage winding is formed by winding on a tool directly and then pouring, so that the heat dissipation capacity and the short-circuit impact resistance of the high-voltage winding are poor.

SUMMERY OF THE UTILITY MODEL

To prior art's not enough, one of the purpose of this application lies in providing a high-voltage winding's winding body, can make the wire coiling more firm, and the high-voltage coil structure of formation has better mechanical strength, and the heat-sinking capability is better, and anti short circuit impact ability is also better.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: a winding body of a high-voltage winding comprises a supporting cylinder and a winding part positioned on the outer peripheral surface of the supporting cylinder, and the winding body is made of fiber reinforced composite materials. The winding body can enable a wire to be wound more firmly, and the formed coil structure has better mechanical strength, better heat dissipation capability and better short circuit impact resistance.

Preferably, the supporting cylinder is a hollow cylinder, so that a tool is convenient to set for winding the wire and coating the high-voltage insulating layer.

Preferably, the winding portion includes a plurality of winding plates circumferentially and uniformly distributed on the outer circumferential surface of the support cylinder, each winding plate being disposed along the axial direction of the support cylinder. The circumferential uniform arrangement of the winding plate ensures that the wires can be wound more firmly on the outer circumferential surface of the supporting cylinder, and the wires can be supported in a balanced manner.

Preferably, the plurality of winding plates are fixed to the outer circumferential surface of the support cylinder by an adhesive. The winding board and the supporting cylinder are connected through the adhesive, materials are saved, and cost can be saved.

Preferably, the plurality of winding plates and the supporting cylinder are integrally formed, so that the strength between the supporting cylinder and the winding plates can be ensured, and the connection between the supporting cylinder and the winding plates is prevented from being damaged due to the fact that the supporting cylinder and the winding plates are not firmly bonded or in the subsequent process of injecting the high-pressure insulating layer.

Preferably, the winding plate is provided with a plurality of winding slots, so that the winding plate forms a plurality of comb teeth. Two adjacent comb teeth on the winding plate can be provided with a coil, and the coil is wound on the comb-shaped winding plate and can be more stable, so that the coil is prevented from shifting. Meanwhile, a wire is wound in each winding groove, high-voltage coils can be reasonably distributed and arranged, each section of coil is arranged at intervals, a cake-shaped coil or a multi-section layered coil can be formed, the stress of the coil structure is balanced, and the mechanical strength is good.

Preferably, the height of the comb teeth along the axial direction of the supporting cylinder is defined as the tooth height, the tooth height of the comb teeth in the middle of the winding board and the tooth height of the comb teeth at the two ends of the winding board are both larger than the tooth height of the comb teeth at the other parts of the winding board, so that the winding board sequentially forms a first high comb tooth area, a first low comb tooth area, a second high comb tooth area, a second low comb tooth area and a third high comb tooth area from one end to the other end in the axial direction of the supporting cylinder. The middle part of the winding board needs to be led out with a tap of the branch line, and the tooth height of the middle part of the winding board is set to be larger, so that a placing space can be reserved for the tap. And because the end part field intensity of the high-voltage coil is not uniform, the tooth heights of the two ends of the winding plate are set to be larger, so that the electric field can be uniform.

Preferably, two ends of the winding body are provided with flanges, the flanges extend outwards along the radial direction of the supporting cylinder at the end part of the supporting cylinder to form an annular disc surface, and the winding part is positioned between the two flanges. The arrangement of the flanging can prevent the winding plate from being damaged due to larger injection pressure in the process of injecting the high-pressure insulating layer.

The second purpose of this application is to provide a high-voltage winding, including above-mentioned high-voltage winding's the bobbin, the wire coiling forms high-voltage coil on the bobbin, high-voltage coil outer whole cladding high-voltage insulation layer, and high-voltage insulation layer parcel bobbin's both ends to form high-voltage winding. The high-voltage winding has the advantages of good fireproof performance, low-temperature resistance, aging resistance and short-circuit resistance test capability, excellent electrical insulation performance, energy conservation and environmental protection.

Preferably, the high-voltage insulating layer is high-temperature vulcanized silicone rubber, so that the insulating property and the mechanical property of the high-voltage winding are integrally improved.

The beneficial effect of this application is: different from the condition of prior art, the high voltage winding's of this application winding body is including a support section of thick bamboo and the wire winding portion that is located a support section of thick bamboo periphery, and this winding body can make the wire coiling more firm, and the high voltage coil structure of formation has better mechanical strength, and the heat-sinking capability is better, and anti short circuit impact ability is also better.

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 a high voltage winding 130 according to an embodiment of the present application;

fig. 9 is a schematic perspective view of a tool attachment 101 according to an embodiment of the present application

FIG. 10 is a schematic circuit diagram of a high voltage coil 1320 according to an embodiment of the subject application;

FIG. 11 is a partial cross-sectional view of a high voltage winding 130 according to an embodiment of the present application;

FIG. 12 is a partial cross-sectional view of a high voltage winding 230 according to another embodiment of the present application;

FIG. 13 is a partial cross-sectional view of a high voltage winding 330 according to yet another embodiment of the present application;

fig. 14 is a partial cross-sectional view of a high voltage winding 430 according to yet another embodiment of the present application.

Detailed Description

As required, detailed embodiments of the present application are disclosed herein. However, it is to be understood that the disclosed embodiments are merely exemplary of the application, which can 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 connection with which such features may not be explicitly disclosed.

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, i.e., a phase, and a phase, i.e., the dry-type transformer 10 includes three single-phase transformers 100. The three transformers 100 may be arranged to form a linear or triangular structure according to the structure of the core 110, and the three transformers 100 have a symmetrical structure. 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 100 are arranged to form a linear configuration, and the dry-type transformer 10 includes an iron core 110, three low voltage windings 120, and three high voltage windings 130. The iron core 110, the low-voltage winding 120 and the high-voltage winding 130 are sequentially arranged from inside to outside. The iron core 110 includes three columnar iron cores 111, an upper iron yoke 112 located at the upper ends of the three columnar iron cores 111, and a lower iron yoke 113 located at the lower ends of the three columnar iron cores 111, the three low-voltage windings 120 are respectively sleeved on the peripheries of the three columnar iron cores 111, and 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. 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, so that three columnar iron cores 111 are fixedly connected to form the three-phase iron core 110 shown in fig. 3.

Schematically, 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 fig. 2, a core clip 140 is disposed on an outer side of the core 110, and the core clip 140 is formed by connecting three clips to each other to form a structure similar to a channel, that is, the core clip 140 is integrally in a shape like a letter' 21274. Wherein the middle clip is disposed close to the core 110 and the other two clips are disposed toward a direction away from the core 110. Of course, in other embodiments, the core clip may also be a rectangular hollow pipe, that is, the core clip is formed by connecting and enclosing four clip structures of a plate structure to form a closed structure, and the structure makes the structure of the core clip more stable; or the core clip may be formed by connecting and surrounding five, six or more clip members of a plate structure to form a closed structure, which 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, and the upper end (i.e., the upper iron yoke 112) of the iron core 110 is clamped and then fixedly connected through a first fastening piece; the other two core clamps 140 are symmetrically disposed at both sides of the lower end of the core 110, and are fixedly connected to the lower end of the core 110 (i.e., the lower yoke 113) by a second fastening member. The first fastener and the second fastener are both screws and bolts used in cooperation to clamp two ends of the iron core 110 through the two iron core clamping pieces 140. First through holes 141 are formed at both ends of the core clamps 140, the two core clamps 140 are correspondingly placed at both sides of the upper end of the core 110, screws (not shown) are simultaneously inserted into the two first through holes 141 at the same end of the two core clamps 140 and then screwed and fixed by bolts, and both ends of the two core clamps 140 are fixed in such a way that the two core clamps 140 clamp the upper end of the core 110. The two core clamps 140 at the lower end of the core 110 are also used to fix and clamp the lower end of the core 110 in the same manner, which is not described in detail. In addition, in order to further reliably clamp the iron core 110, the middle portion of the iron core clamp 140 also adopts a plurality of screws and bolts which are used in cooperation with each other to clamp the middle portion of the iron core 110. The core clamp 140 further has a second through hole (not shown) for connecting with the low voltage winding 120.

The core clip 140 is made of a fiber-reinforced composite material, and may be molded by glass fiber-impregnated epoxy resin, or by aramid fiber-impregnated epoxy resin, or may be integrally molded by other composite materials, which is not limited herein.

The fiber reinforced composite material is formed by winding, molding or pultrusion a reinforcing fiber material, such as glass fiber, aramid fiber and the like, and a matrix material.

In other embodiments, the core clip may also be made of a metal material, and may be an integrally formed channel, or may be formed separately and then fixed by welding. At this time, an insulating component such as a small post insulator needs to be connected outside the core clamp to insulate the high-low voltage wiring from the metal channel. Simultaneously, also should set up insulating pad outside the iron core, make on the one hand insulating between iron core and the iron core folder, on the other hand avoids producing the vortex on the iron core folder and causes the electromagnetic loss of iron core.

The core clip 140 made of the fiber reinforced composite material in the embodiment has more excellent economic performance compared with the core clip of the traditional channel steel structure, an insulating pad fixed on the outer surface of the core 110 can be omitted, the cost of the fiber reinforced composite material is lower, and the total cost can be reduced by about 60%. Meanwhile, because the traditional channel steel structure is made of a metal conductive material, an additional insulating part such as a small post insulator needs to be connected to the iron core clamp for insulation, so that the cost is increased, the weight of the whole equipment is increased, the noise is high during the operation of the equipment, the carbon emission in the production process of ironwork is large, the pollution is serious, and the iron core clamp 140 made of a fiber reinforced composite material solves the problems; in addition, the core clip 140 made of the fiber reinforced composite material does not generate eddy current loss in the composite body, thereby reducing no-load loss of the dry type transformer 10. In summary, the core clip 140 made of the fiber reinforced composite material has low cost, light weight and good mechanical property, and the carbon emission amount in the production process of the fiber reinforced composite material is low, so that the fiber reinforced composite material is more green and more environment-friendly.

Referring to fig. 2 and 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 disposed. Specifically, the copper foil 121 is wound by winding the entire copper foil, and the low-voltage insulating layer 122 is wound together after being overlapped with the copper foil 121, so that the alternating arrangement of the copper foil 121 and the low-voltage insulating layer 122 is realized. 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. Specifically, the supporting bar 123 is an insulating supporting bar 123, and when the copper foil 121 and the low-voltage insulating layer 122 are overlapped and wound to a fixed thickness, the insulating supporting bar 123 is fixed on the outer surface of the low-voltage insulating layer 122 or the copper foil 121, and the overlapping and winding are continued to make the copper foil 121 or the low-voltage insulating layer 122 tightly adhere to the insulating supporting bar 123, and the insulating supporting bar 123 may be fixed between the adjacent copper foil 121 and the low-voltage insulating layer 122 by an adhesive method, or may be fixed by a pressing force generated during winding or other methods. Be equipped with a plurality of insulating support bars 123 in every layer of heat dissipation air flue, a plurality of insulating support bars 123 set up along the circumference interval of copper foil 121 outer peripheral face, play the effect of supporting adjacent copper foil 121 and low pressure insulating layer 122 simultaneously. The number of the insulation support bars 123 arranged in each layer of the heat dissipation air channel is at least two, and may be two, three, four, or more. Preferably, a plurality of insulation support bars 123 of the same layer are uniformly spaced along the circumferential direction of the outer circumferential surface of the copper foil 121. After the insulating support bars 123 are arranged, the copper foil 121 and the low-voltage insulating layer 122 are continuously wound in an overlapping mode to a preset thickness, and the low-voltage winding 120 is formed. Due to the arrangement of the heat dissipation air passage, heat generated by the low-voltage winding 120 can be released in the operation process of the dry-type transformer 10, and the dry-type transformer 10 is prevented from being overheated and losing efficacy. The heat dissipation air channel may be provided with one layer, or may be provided with two or more layers, which is not limited herein.

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

The insulating support bar 123 is made of glass fiber-impregnated epoxy resin, or made of 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. 5-10, 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. Specifically, the winding body 1310 includes a supporting cylinder 1311 and a winding portion 1312, where the supporting cylinder 1311 is a hollow cylinder, and may be a hollow cylinder, a hollow elliptic cylinder, or another hollow cylinder; 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.

Specifically, the winding portion 1312 includes a plurality of winding plates 1313, the plurality of winding plates 1313 are circumferentially and uniformly distributed on the outer circumferential surface of the support cylinder 1311, each winding plate 1313 is disposed along the axial direction of the support cylinder 1311, and the axial length of the winding plate 1313 along the support cylinder 1311 is smaller than the axial length of the support 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 wire winding reliable and save material as much as possible, the number of the winding plates 1313 of the 10kV/1000kVA dry type transformer is twelve. In other embodiments, the length of the wire winding plate in the axial direction of the support cylinder may also be equal to the length of the support cylinder in the axial direction thereof.

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 conducting 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. Meanwhile, a comb tooth area with a slightly larger tooth height is defined as a high comb tooth area, and a comb tooth area with a slightly smaller tooth height is defined as a low comb tooth area. Then, through the above arrangement, the winding board 1313 sequentially forms a first high comb tooth area, a first low comb tooth area, a second high comb tooth area, a second low comb tooth area, and a third high comb tooth area from one end toward the other end in the axial direction of the supporting cylinder 1311. Further, the tooth heights of the first high comb-tooth region, the second high comb-tooth region and the third high comb-tooth region are not particularly limited, and may be, for example, the same as each other or may be different from each other. And the first high comb tooth area and the third high comb tooth area can be symmetrically arranged relative to the second high comb tooth area, and the first low comb tooth area and the second low comb tooth area can also be symmetrically arranged relative to the second high comb tooth area. Of course, the arrangement may be asymmetric, and is not limited herein.

When 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 manner, the winding grooves 1314 on all the winding plates 1313 are matched in a one-to-one correspondence manner in the circumferential direction of the supporting cylinder 1311, each section of coil is wound in a corresponding circle of winding groove 1314 on all the winding plates 1313 along the circumferential direction of the supporting cylinder 1311 by a conducting wire, and the supporting cylinder 1311 is balanced in stress and good in mechanical strength.

In other embodiments, in order to keep away from the arrangement position of the tap, the plurality of winding boards may also be fixed on the outer circumferential surface of the supporting cylinder in an uneven arrangement manner, that is, the distance between two adjacent winding boards is unequal, for example, the distance between two adjacent winding boards is greater than the distance between any two other adjacent winding boards, at this time, each tap is led out from between the two adjacent winding boards, so that the tooth height of the comb teeth in the middle of the winding boards does not need to be set larger, and the arrangement position of each tap can also be left.

In other embodiments, the wire winding plate may also be an annular disc disposed circumferentially around 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 a groove formed by two adjacent winding plates.

The supporting cylinder 1311 is a hollow pipe formed by winding, curing, or pultrusion glass fiber impregnated with epoxy resin, or formed by winding, pultrusion aramid fiber impregnated with epoxy resin, or formed by winding, curing, or pultrusion aramid fiber impregnated with epoxy resin, or formed by using other composite materials, which is not limited herein.

In an application scene, the supporting cylinder 1311 and the winding board 1313 are formed separately and then are bonded and fixed. Specifically, the winding board 1313 is also made of glass fiber impregnated epoxy resin, multiple layers of glass fiber cloth are impregnated with epoxy resin and then stacked to form a certain thickness, the glass fiber cloth is molded and cured to form a rectangular glass fiber reinforced plastic plate, a winding groove 1314 is formed in the glass fiber reinforced plastic plate, the winding groove 1314 can be formed by turning, and therefore the winding board 1313 is formed, the winding board 1313 is fixedly connected to the outer peripheral surface of the supporting cylinder 1311 through adhesive, materials are saved, and cost can be saved. The adhesive is a two-component high temperature resistant epoxy adhesive, which may be other adhesives, but it is required to ensure that the adhesive can firmly bond the supporting cylinder 1311 and the winding board 1313, and is high temperature resistant so as to adapt to the high temperature injection high pressure insulation layer 1330 outside the winding body 1310.

It should be noted that, in this embodiment, the winding board 1313 is molded and cured, and in other embodiments, the comb-shaped winding board may be directly formed by integral casting and curing, so as to simplify the process, and the material of the winding board is the same as that described above, and is not described again.

In another application scenario, the supporting cylinder 1311 is integrally formed with the wire winding plate 1313. Specifically, the supporting cylinder 1311 and the winding board 1313 are formed by pultrusion or winding a hollow pipe with a large thickness by using glass fiber or aramid fiber impregnated epoxy resin, and then turning the hollow pipe, so that the materials are wasted, but the strength between the supporting cylinder 1311 and the winding board 1313 can be ensured, and the connection between the supporting cylinder 1311 and the winding board 1313 is prevented from being damaged due to the unreliable bonding or the subsequent injection of the high-pressure insulating layer 1330.

In still another application scenario, as shown in fig. 5 and 6, the winding body 1310 further includes two flanges 1315, specifically, 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 where the two flanges 1315 face each other, so as to prevent the winding board 1313 from being damaged due to a large injection pressure during the injection of the high-voltage insulating layer 1330. Of course, the outer end surfaces of the two ends of the winding plate 1313 may not abut against the disc surfaces of the two flanges 1315 facing each other, that is, a gap may be left between the outer end surfaces of the two ends of the winding plate 1313 and the disc surfaces of the flanges 1315 facing the winding plate 1313, which is not limited herein.

The flange 1315 is made of glass fiber impregnated epoxy resin, and is integrally formed with the support barrel 1311, that is, formed by pultrusion or winding of glass fiber or aramid fiber impregnated epoxy resin, and then is machined and polished into a disk piece with a certain thickness.

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 body 1310 caused by the generation of excessive heat from the high voltage coil 1320 during the operation of the dry type transformer 10.

Referring to fig. 5, 7 and 8, taking the phase a transformer 100 as an example, a wire is wound around the outer circumferential surface of the winding body 1310 in the circumferential direction to form the high voltage coil 1320. Specifically, the wire is wound in the winding slot 1314 of the winding portion 1312, so that the high-voltage coil 1320 is spaced apart from the supporting cylinder 1311 in the axial direction, and the wire forms two external connections, namely a first external connection D and a second external connection X, at the end and the end after winding, the first external connection D is used for connecting a cable, and the second external connection X is used for connecting other external connections, such as in a three-phase transformer, for connecting with each other between the phase transformers. And, 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 switch, and for convenience of description, tap 2, tap 4, and tap 6 are defined as a first tap switch, and tap 3, tap 5, and tap 7 are defined as a second tap switch.

In an application scenario, as shown in fig. 5, 7 and 10, the wires include a first wire and a second wire, both the first wire and the second wire are continuous wires, and both the first wire and the second wire are covered with an insulating layer, the insulating layer may be a polyimide film or a glass fiber film, or the insulating layer is another insulating material such as polyester paint, or may be a combination of multiple insulating materials, which is not limited herein. The first conductive wire is wound from one end of the winding portion 1312 to the middle of the winding portion 1312 in the axial direction of the support tube 1311, and three taps are drawn. For convenience, the upper end of the winding portion 1312 is defined as a first end, the lower end of the winding portion 1312 is defined as a second end, the first wire is wound from the first end of the winding portion 1312 to the second end of the winding portion 1312, and the first wire is wound in a first winding slot 1314 of a corresponding turn on all winding plates 1313 to form a first coil segment 1321, the first coil segment 1321 is formed by pie winding, and only one pancake coil is disposed in each winding slot 1314, and at this time, only one pancake coil is disposed in each winding slot 1314. The inner turn lead end of the first lead at the first end of the winding portion 1312 forms a first external connection D exposed outside the high voltage insulation layer 1330, that is, the first external connection D is led out from the inner turn lead end of the first coil 1321 (i.e., the head end of the first lead), the outer turn lead end of the first coil 1321 extends into a corresponding circle of second winding groove 1314 on all the winding plates 1313 to continue to be wound to form a second coil 1322, and so on until the first lead is wound to the middle of the winding body 1310, and three taps, that is, a tap 6, a tap 4 and a tap 2 shown in fig. 10, are led out from the outer turn lead ends of three coils respectively, so that the first lead is wound.

A second conductive wire is wound from the middle of the winding portion 1312 to a second end of the winding portion 1312 in the axial direction of the support tube 1311 and led out of the other three taps. Specifically, the second wire starts to be wound in the winding slot 1314 of the next turn adjacent to the tap 2 to form a third-stage coil 1323, the second wire continues to be wound toward the second end of the winding portion 1312 in the same winding manner as the first wire, and three other taps, i.e., tap 3, tap 5 and tap 7, respectively, are led out from the three-stage coil in which the third-stage coil 1323 starts until the second wire is wound to the last winding slot 1314 of the corresponding turn on each winding plate 1313 at the second end of the winding portion 1312 to form a terminal-stage coil 1324. The outer-turn end of the second wire at the second end of the winding portion 1312 forms a second outer connection X exposed outside the high-voltage insulation layer 1330, that is, the second outer connection X is led out from the outer-turn end of the terminal-section coil 1324 (i.e., the end of the second wire), so that the second wire is wound.

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.

Thus, a pancake high-voltage coil 1320 is formed, which has a high mechanical strength, a high ability to withstand the electromotive force generated by the short-circuit current, a large number of pancake coils, and a high heat dissipation ability as compared with a layered coil. Further, in the axial direction of the support cylinder 1311, as shown in fig. 8 and 10, 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, and the first tap changer and the second tap changer are arranged in parallel, and six taps form tapping means of the high voltage coil 1320 for the dry type transformer 10 to adjust voltage according to different operating conditions.

The high voltage coil 1320 is wound around the winding 1310 to form a high voltage coil 1320, and the high voltage coil 1320 is annular, and the annular width of the high voltage coil 1320 is defined as the width of the high voltage coil 1320, so that the widths of the high voltage coil 1320 in all radial sections are the same, that is, the outer side surface of the high voltage coil 1320 is equidistant from the outer circumferential surface of the supporting cylinder 1311, and the high voltage coil 1320 is stressed in a balanced manner. Of course, in consideration of actual operation, the widths of the coils in the radial cross section may not be exactly the same, as long as they are substantially the same.

In this embodiment, the second conductive wire is wound from the winding groove 1314 of the next winding turn adjacent to the tap 2 to the winding groove 1314 of the last winding turn at the second end of the winding portion 1312, and in other embodiments, the second conductive wire may be wound from the winding groove of the last winding turn at the second end of the winding portion up to the winding groove of the next winding turn adjacent to the tap 2, so that the second external connection X is formed first, and then the tap 7, the tap 5 and the tap 3 are formed in this order. Of course, the winding method of the high voltage coil 1320 is not limited to the above method, and a pancake coil or a layer coil may be formed in other methods as long as the high voltage coil 130 can be finally formed.

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.

As shown in fig. 7-9, a high voltage insulation 1330 surrounds the high voltage coil 1320 and the bobbin 1310 to form the high voltage winding 130. The high-voltage insulating layer 1330 is made of high-temperature vulcanized silicone rubber, specifically, a conducting wire is wound on the winding 1310 to form the high-voltage coil 1320, the winding 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 of an injection machine, and the high-temperature vulcanized silicone rubber is injected integrally around the body to be injected by adding silicone rubber raw materials, so that the high-voltage winding 130 is obtained. 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.

After the high-voltage coil 1320 and the bobbin 1310 are coated by the integral vacuum injection of the high-temperature vulcanized silicone rubber, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the bobbin 1310 and coats the two ends of the bobbin 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 in a hollow cylindrical shape, which may be a hollow cylinder, a hollow elliptic cylinder, or other hollow cylindrical bodies.

Before the high-temperature vulcanized silicone rubber is integrally injected, the tool connecting piece 101 is arranged to connect six taps, so that the six taps are prevented from being coated by the silicone rubber and cannot be used for wiring in the injection process. As shown in fig. 9, the tooling connecting member 101 is an aluminum alloy plate, a protection cavity is formed on the plate surface of the tooling connecting member 101, and the tap is fixed in the protection cavity. In this application, the protection cavity is six identical stepped holes 1011, and the inner walls of the stepped holes 1011 are further provided with threads. The six taps are respectively connected to the six stepped holes 1011, and may be connected by welding, or may be fixedly connected by other methods, which is not limited herein. Furthermore, six step holes 1011 on the tool connecting piece 101 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.

Two opposite side surfaces of the tooling connecting part 101 are also provided with two symmetrical connecting grooves 1012, two connecting blocks are correspondingly arranged in the injection mold, and when the tooling connecting part 101 is arranged in the injection mold, the two connecting grooves 1012 on the tooling connecting part are respectively clamped and connected with the two connecting blocks on the injection mold, so that the tooling connecting part 101 is fixed in the injection mold, and the position of the tooling connecting part 101 is prevented from being deviated due to larger injection pressure in the process of injecting silicon rubber.

In other embodiments, two symmetrical connecting blocks may be arranged on two opposite side surfaces of the tool connecting part, two connecting grooves are correspondingly arranged in the injection mold, and when the tool connecting part is arranged in the injection mold, the two connecting blocks on the tool connecting part are respectively clamped and connected with the two connecting grooves on the injection mold, so that the tool connecting part is fixed in the injection mold, and the tool connecting part is prevented from being shifted due to larger injection pressure in the process of injecting the silicon rubber. After the high voltage insulation layer 1330 is formed by integral injection, the side surface of the tooling connection piece 101 is coated with a small amount of silicon rubber, and because the amount of the silicon rubber coated on the tooling connection piece 101 is small, the tooling connection piece 101 can be directly disassembled by a tool to expose the first tap switch and the second tap switch, and finally the high voltage winding 130 shown in fig. 8 is formed.

In this embodiment, there is one tool connection piece 101, in other embodiments, there may be two tool connection pieces, the size of the tool connection piece at this time is set to be smaller, each tool connection piece is provided with three step holes, and six taps are connected to the six step holes, respectively, which is not limited herein.

In the present embodiment, as shown in fig. 11, which is a partial cross-sectional view of the high-voltage winding 130 coated with the high-voltage insulating layer 1330 along the axial direction thereof, the wire is wound in the comb-teeth-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.

In another embodiment, as shown in fig. 12, which is a partial sectional view of the high voltage winding 230 coated with the high voltage insulation layer 2330, taken along its axial direction, the wire is wound on the comb-shaped winding plate 2313 by a double winding continuous winding method to form the high voltage coil 2320. After two identical continuous leads are arranged adjacently, winding is started from a circle of winding grooves 2314 corresponding to the upper ends of all the winding plates 2313 at the same time, a first section of coil 2321 is formed, the first section of coil 2321 comprises two pancake coils which are arranged adjacently along the axial direction of the supporting cylinder 2311, the specific winding method is consistent with that of the high-voltage coil 1320, downward winding is performed by analogy in sequence, a second section of coil 2322 and other coils are continuously formed until the high-voltage coils 2320 which are arranged at intervals along the axial direction of the high-voltage winding 230 are formed, each section of coil comprises two pancake coils which are arranged adjacently, the length of each section of coil along the axial direction of the winding plates 2313 is equal to the sum of the widths of the two parallel leads along the axial direction of the supporting cylinder 2311, and two pancake coils are arranged between two adjacent comb teeth on the winding plates 2313. The two same wires mean that the two wires are identical in size and material. Compared with a continuous winding structure of a single wire (namely the structure of the high-voltage coil 1320), the number of the winding grooves 2314 can be reduced in the high-voltage winding with the same size, so that the wire transition section between the interval sections of each section of the coil is reduced, the using amount of the wire is reduced, and the purpose of reducing the cost is achieved. In other embodiments, three pie coils or more pie coils can be arranged between two adjacent comb teeth on the winding plate.

In still another embodiment, as shown in fig. 13, which is a partial sectional view of the high voltage winding 330 coated with the high voltage insulating layer 3330 taken along an axial direction thereof, a width of the winding grooves 3314 of the winding plate 3313 in the axial direction of the support cylinder 3311 is greater than a width of the winding grooves 2314 of the winding plate 2313 in the axial direction of the support cylinder 2311. The wire is wound layer-wise to form a first coil section 3321, specifically, a continuous wire is used, and the first coil section 3321 is wound in a circle of first winding slots 3314 corresponding to the upper ends of all the winding plates 3313, and is wound downward along the axial direction of the supporting barrel 3311 at the upper end of the first winding slot 3314 until the wire is wound to the lower end of the first winding slot 3314 to form a first coil layer, the wire of the first coil layer is wound in a spiral shape closely arranged on the outer circumference of the supporting barrel 3311, after the wire is wound in the first coil layer, the second coil layer is wound upward from the lower end of the first winding slot 3314 in the axial direction of the supporting barrel 3311, and the winding is repeated until the first coil section 3321 reaches the preset width of the high-voltage coil 3320 in the radial direction of the supporting barrel 3311, and finally the first coil section 3321 is wound in a spiral shape closely arranged on the outer circumference of the supporting barrel 3311. Then, the wire is transited to the second winding slot 3314 through the comb teeth of the winding plate 3313, and the winding is continued by a layer winding method to form a second coil section 3322, and so on, until the winding of the wire in all the winding slots 3314 is completed, thereby finally forming the high voltage coil 3320.

Because the winding slots 3314 have a larger axial width along the supporting tube 3311, each segment of coil is spirally arranged along the axial direction of the winding plate 3313, and the length of each segment of coil along the axial direction of the winding plate 3313 is greater than the sum of the widths of two parallel wires, so as to form a multi-segment cylindrical high-voltage coil 3320, compared with a pancake structure (i.e., the structure of the high-voltage coil 2320) wound by adopting a double-winding continuous winding method, in the high-voltage winding with the same specification, the high-voltage coil 3320 is more compact, the number of the winding slots 3314 is less, the number of wires is less, and the purpose of reducing the cost is further achieved.

In this embodiment, the first coil section 3321 and the second coil section 3322 are separated by the comb teeth by providing the wire winding plate 3313, but in other embodiments, the wire winding plate may not be provided, and a gap may be left between the first coil section and the second coil section, and finally the high-voltage coil may be fixed by filling the high-voltage insulating layer, thereby achieving the purpose of insulating the high-voltage coil between the sections.

In another embodiment, as shown in fig. 14, which is a partial cross-sectional view of a high-voltage winding 430 covered with a high-voltage insulation layer 4330 taken along an axial direction thereof, a forming manner of a high-voltage coil 4320 is the same as that of the high-voltage coil 3320, and is not described again. However, the length of each segment of the high-voltage coil 4320 in the axial direction of the support cylinder 4311 is greater than that of each segment of the high-voltage coil 3320 in the axial direction of the support cylinder 3311, and the dry-type transformer 10 of the same voltage class has fewer segments of the segmented cylindrical high-voltage coil 4320. Since the length of each segment of the high-voltage coil 4320 along the axial direction of the support cylinder 4311 is greater, the voltage difference between each segment of the coil is greater, and therefore, an insulating layer needs to be added between layers of each segment of the coil to reduce the voltage difference, at this time, the interlayer insulating layer 4301 is disposed along the axial direction of the high-voltage winding 430, so as to prevent the electric field intensity between the layers from being higher than the tolerance threshold value of the insulating film coated by the insulating wire. And moreover, the layered structure in each section of coil has good lightning impulse resistance, and the economic advantage is more obvious. Specifically, when the wire is wound to a certain thickness by a layer winding method, the wire is continuously wound after the interlayer insulating layer 4301 is placed at a corresponding position, and the interlayer insulating layer 4301 is arranged in each coil.

The interlayer insulating layer 4301 may be a mesh cloth, insulating struts circumferentially arranged at intervals, or other hard insulating materials. And the insulating supporting strip is an insulating strip with wavy edges, so that the insulating supporting strip can be prevented from being damaged due to extremely high injection pressure when high-temperature vulcanized silicone rubber is injected to form a high-voltage insulating layer. And the insulating support strip is made of hard insulating materials and can resist the impact force of silicon rubber during high-temperature injection. Meanwhile, the interlayer insulating layer 4301 may be provided as one layer, or may be provided as two or three layers, depending on different design conditions, which is not limited herein.

The beneficial effect of this application is: be different from prior art's condition, the winding body of high voltage winding of this application is including a supporting cylinder and the wire winding portion that is located a supporting cylinder peripheral face, and this winding body can make the wire coiling more firm, and the high-voltage coil structure of formation has better mechanical strength, and the heat-sinking capability is better, and anti short circuit impact ability is also better.

In addition, the high-voltage insulation layer of this application high temperature vulcanized silicone rubber is poured outside high-voltage coil, compares the epoxy high-voltage insulation layer among the prior art, and the silicone 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 more energy is saved; 5) The environment resistance is good, and the device can be installed indoors and outdoors. Meanwhile, the silicon rubber is formed by integral high-temperature vulcanization injection molding, and compared with the existing room-temperature vulcanization, the process method enables the high-voltage insulating layer to be more stable, has higher mechanical property and better bonding property with the high-voltage coil and the winding body, and can effectively prolong the service life of the high-voltage insulating layer. 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.

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 (10)

1. The winding body of the high-voltage winding is characterized by comprising a supporting cylinder and a winding part positioned on the outer peripheral surface of the supporting cylinder, and the winding body is made of fiber reinforced composite materials.

2. The bobbin for a high-voltage winding according to claim 1, wherein the supporting cylinder is a hollow cylinder.

3. The bobbin for a high-voltage winding according to claim 1, wherein said winding portion includes a plurality of winding plates circumferentially and uniformly distributed on an outer peripheral surface of said bobbin, each of said winding plates being disposed in an axial direction of said bobbin.

4. A bobbin for a high-voltage winding according to claim 3, wherein a plurality of said winding plates are fixed to an outer peripheral surface of said supporting cylinder by an adhesive.

5. A bobbin for a high voltage winding according to claim 3, wherein a plurality of said winding plates are formed integrally with said supporting cylinder.

6. A bobbin for a high-voltage winding according to claim 3, wherein said bobbin plate is provided with a plurality of winding slots so that said bobbin plate forms a plurality of comb teeth.

7. The winding body for a high-voltage winding according to claim 6, wherein the height of said comb teeth in the axial direction of said supporting cylinder is defined as a tooth height, and the tooth height of said comb teeth in the middle of said winding plate and the tooth height of said comb teeth at both ends of said winding plate are each larger than the tooth height of said comb teeth in the other portions of said winding plate, so that said winding plate sequentially forms a first high comb tooth region, a first low comb tooth region, a second high comb tooth region, a second low comb tooth region, and a third high comb tooth region from one end toward the other end in the axial direction of said supporting cylinder.

8. The bobbin for high-voltage winding according to claim 1, wherein flanges are provided at both ends of the bobbin, the flanges extend outward in a radial direction of the supporting cylinder at the end of the supporting cylinder to form an annular disc surface, and the winding portion is located between the two flanges.

9. A high-voltage winding, comprising the winding body of the high-voltage winding according to any one of claims 1 to 8, wherein a conducting wire is wound on the winding body to form a high-voltage coil, the high-voltage coil is integrally covered by a high-voltage insulating layer, and the high-voltage insulating layer covers two ends of the winding body.

10. The high voltage winding of claim 9 wherein the high voltage insulation layer is a high temperature vulcanized silicone rubber.

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