Patent Application
20250111990
The present disclosure relates to the field of power transformer technologies, and in particular, to a high-voltage winding and a method for manufacturing a high-voltage winding.
At present, transformers may be classified into: oil-immersed type transformers, dry-type transformers, and gas-filled type transformers. The dry-type transformers have advantages such as no oil, fire prevention, long service life, energy saving and low noise, simple maintenance, safety, and reliability. At present, most of the dry-type transformers on the market are dry-type transformers including high-voltage windings cast with resin and open dry-type transformers. Although the dry-type transformers have made great progress in the past 10 years, there are still problems such as insulation cracking, poor heat conduction, and harsh operating environments during the operation.
In a conventional method for manufacturing a high-voltage winding, generally, a wire is wound on a tool to form a high-voltage coil, and then the high-voltage coil is cast to form the high-voltage winding, resulting in poor heat dissipation and short-circuit impact resistance of the high-voltage coil.
With respect to the deficiencies in the prior art, the present disclosure is intended to provide a high-voltage winding and a method for manufacturing a high-voltage winding. The high-voltage winding has recyclable coils, and low energy consumption, and is energy-efficient and environmentally friendly. An insulating layer is stable, and thus has good mechanical performance and a long service life.
According to an aspect of the present disclosure, a high-voltage winding is provided, including: a winding body, a high-voltage coil, and a high-voltage insulating layer. A wire is wound on the winding body to form the high-voltage coil, and the high-voltage insulating layer is wrapped around the high-voltage coil and the winding body.
In an embodiment, the winding body is made of a fiber-reinforced composite material.
In an embodiment, the high-voltage insulating layer is injection-molded silicone rubber.
In an embodiment, the winding body includes a winding portion, and the high-voltage coil includes a plurality of coil sections, the coil sections are wound on the winding portion and spaced apart along an axial direction of the high-voltage winding.
In an embodiment, the wire includes a first wire and a second wire, the first wire is wound from a first end of the winding portion to a middle of the winding portion along the axial direction of the high-voltage winding, and the second wire is wound from the middle of the winding portion to a second end of the winding portion along the axial direction of the high-voltage winding.
In an embodiment, an inner-turn wire end of the first wire located at the first end of the winding portion forms a first external connection exposed to an outside of the high-voltage insulating layer, and an outer-turn wire end of the second wire is located at the second end of the winding portion forms a second external connection exposed to the outside of the high-voltage insulating layer.
In an embodiment, the winding portion includes a plurality of winding plates, each of the winding plates is provided with a plurality of comb teeth, the winding plates are arranged along a circumferential direction of the high-voltage winding, and at least one of the coil sections is arranged between two adjacent comb teeth on the winding plates.
In an embodiment, wherein a height of the comb tooth along the axial direction of the high-voltage winding is defined as a tooth height, and tooth heights of the comb teeth in a middle of the winding plate and tooth heights of the comb teeth at two ends of the winding plate are both greater than tooth heights of the comb teeth in other parts of the winding plate, so that a first high comb-tooth region, a first low comb-tooth region, a second high comb-tooth region, a second low comb-tooth region, and a third high comb-tooth region are sequentially formed on the winding plate from an end of the winding plate to the other end of the winding plate in the axial direction of the high-voltage winding.
In an embodiment, each of the coil sections is reciprocally wound in layers along the axial direction of the high-voltage winding.
In an embodiment, the coil section is provided with at least one interlayer insulating layer along the axial direction of the high-voltage winding.
In an embodiment, the interlayer insulating layer is an insulating long strip with wavy edges.
In an embodiment, the high-voltage coil has a same width on radial sections of the high-voltage coil.
In an embodiment, the injection-molded silicone rubber is wrapped around the high-voltage coil and the winding body by integral vacuum injection, and the injection-molded silicone rubber fills a gap between the high-voltage coil and the winding body and is wrapped around two ends of the winding body.
In an embodiment, the winding body further includes a supporting barrel, the winding portion is arranged on an outer peripheral surface of the supporting barrel, and the supporting barrel is a hollow column.
According to another aspect of the present disclosure, a method for manufacturing a high-voltage winding, the high-voltage winding being the high-voltage winding according to any one of the foregoing embodiments, wherein the method includes the following steps:
In an embodiment, the winding body includes a supporting barrel and a winding portion located on an outer peripheral surface of the supporting barrel, and in Step 1000, the wire is wound on the winding portion to form the high-voltage coil.
In an embodiment, in Step 1100, the protective chamber includes a stepped hole, and the tap is welded in the stepped hole.
In an embodiment, an inner wall of the stepped hole is provided with threads, and prior to Step 1200, a bolt is connected in the stepped hole.
In an embodiment, prior to Step 1000, the supporting barrel and the winding portion are made of glass fibers impregnated with epoxy resin.
In an embodiment, prior to Step 1000, the winding plates are circumferentially and evenly distributed, bonded, and fixed to the outer peripheral surface of the supporting barrel.
In an embodiment, prior to Step 1000, each of the winding plates is provided with a plurality of winding grooves, so that a plurality of comb teeth is formed on the winding plate.
In an embodiment, in Step 1200, the injection-molded silicone rubber is wrapped around the high-voltage coil and the winding body by integral vacuum injection and fills a gap between the high-voltage coil and the winding body and is wrapped around two ends of the winding body.
According to another aspect of the present disclosure, a method for manufacturing a high-voltage winding is provided, the high-voltage winding being the high-voltage winding according to any one of the foregoing embodiments, the winding body including an auxiliary member and a winding portion, the winding portion being fixed and connected to the auxiliary member, and the high-voltage insulating layer being wrapped around the high-voltage coil, the winding portion, and the auxiliary member, wherein the method includes the following steps:
In an embodiment, the winding tool includes a mold and a connecting rod, the connecting rod is extended through the mold along an axial direction of the mold, and in Step 2000, the high-temperature resistant film is fixed to an outer peripheral surface of the mold with a high-temperature resistant adhesive tape.
In an embodiment, the auxiliary member includes a middle auxiliary member, and in step 2100, the middle auxiliary member first is sleeved on the high-temperature resistant film, and then the winding portion is arranged along a circumferential direction of the winding tool to enable an inner wall of the middle auxiliary member to be flush with an inner wall of the winding portion.
In an embodiment, the inner wall of the winding portion is provided with a recess, and in Step 2100, the middle auxiliary member is engaged in the recess to enable the middle auxiliary member to be fixed and connected to the winding portion.
In an embodiment, the auxiliary member includes an end-portion auxiliary member, and in Step 2100, the winding portion is arranged along a circumferential direction of the winding tool, and then the end-portion auxiliary member is fixed to an outer side of an end portion of the winding portion.
In an embodiment, the outer side of the end portion of the winding portion is provided with a slot, and in Step 2100, the end-portion auxiliary member is embedded into the slot.
In an embodiment, the winding portion includes a plurality of comb-shaped winding plates, and in Step 2100, the winding plates are spaced apart and circumferentially and evenly distributed on the outer peripheral surface of the winding tool.
In an embodiment, subsequent to Step 2400, the method further includes:
In an embodiment, in Step 2100, the winding portion or the auxiliary member is bonded to the high-temperature resistant film.
According to a more specific description of preferred embodiments of the present disclosure shown in the accompanying drawings, the foregoing objectives, other objectives, features, and advantages of the present disclosure will be clearer. In all the accompanying drawings, a same reference numeral denotes a same part. The drawings are not deliberately drawn to scale according to an actual size and the like, and a focus lies in highlighting the subject of the present disclosure.
Other features, objectives, and advantages of the present disclosure will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.
Specific embodiments of the present disclosure are disclosed herein as required. However, it is to be understood that the embodiments disclosed herein are merely typical examples of the present disclosure, which 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 those skilled in the art to differently employ the present disclosure in any appropriate manner in practice, including employing various features disclosed herein in combination with features that might not be explicitly disclosed herein.
The term “connect” as referred to in the present disclosure should be understood in a broad sense unless otherwise clearly stipulated or limited, which may be a direct connection or a connection through an intermediary. In the description of the present disclosure, it is to be understood that the orientation or position relationships indicated by the terms “upper”, “lower”, “end portion”, “an end”, and the like are based on the orientation or position relationships shown in the accompanying drawings and are intended to facilitate the description of the present disclosure and simplify the description only, rather than indicating or implying that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore are not to be interpreted as limiting the present disclosure.
As shown in
Still referring to
Referring to
In an embodiment according to the present disclosure, four core clamps 140 are provided, and two of the four core clamps 140 are symmetrically arranged on two sides of an upper end of the core 110 and are fixedly connected through a first fastener to clamp the upper end of the core 110 (i.e., the upper yoke 112). The other two of the four core clamps 140 are symmetrically arranged on two sides of a lower end of the core 110 and are fixedly connected through a second fastener to clamp the lower end of the core 110 (i.e., the lower yoke 113). Preferably, both the first fastener and the second fastener adopt a plurality of screws and bolts used in conjunction with each other, so that two ends of the core 110 are clamped through the two core clamps 140 respectively. Two ends of the core clamps 140 are both provided with first through holes 141. Specifically, two ends of the first clamp 142 are each provided with one first through hole 141. The two core clamps 140 are correspondingly placed on the two sides of the upper end of the core 110, and a screw rod (not shown in figures) is inserted into the two first through holes 141 at a same end of the two core clamps 140, and then the two core clamps 140 are fixed by tightening a bolt. The two ends of the two core clamps 140 are both fixed in this manner, so 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 fixed and clamp the lower end of the core 110 in the same manner. Details are not described again. Alternatively, in order to further reliably clamp the core 110, middle parts of the core clamps 140 may also adopt a plurality of screws and bolts used in conjunction with each other to clamp the middle of the core 110. The second clamps 143 are further provided with second through holes (not shown in figures) to be connected to the low-voltage windings 120.
In this embodiment, the two core clamps 140 at the upper end are located above the high-voltage windings 130 arranged on the periphery of the core 110. Tops of the high-voltage windings 130 are provided with a plurality of insulating pads 1001 for supporting the two core clamps 140 at the upper end and keeping the low-voltage windings 120 and the high-voltage windings 130 at a safe electrical distance from the upper yoke 112 respectively. Similarly, the two core clamps 140 at the lower end are located below the high-voltage windings 130 arranged on the periphery of the core 110. Tops of the two core clamps 140 at the lower end are also provided with a plurality of insulating pads 1001 for supporting the low-voltage windings 120 and the high-voltage windings 130 and keeping the low-voltage windings 120 and the high-voltage windings 130 at a safe electrical distance from the lower yoke 113 respectively. Alternatively, the insulating pads 1001 are made of insulating materials, for example, low shrinkage unsaturated polyester glass fiber-reinforced molding compounds such as dough molding compounds (DMCs) and sheet molding compounds (SMCs), or are molded, for example, by casting with epoxy resin. The core clamps 140 are made of fiber-reinforced composite materials. Specifically, the core clamps 140 may be compression-molded from glass fibers impregnated with epoxy resin or from aramid fibers impregnated with epoxy resin. Alternatively, the core clamps 140 may also be made of other composite materials. Alternatively, the first clamp 142 and the second clamps 143 are integrally formed.
The fiber-reinforced composite materials refer to composite materials formed by reinforced fiber materials, such as glass fibers or aramid fibers, and matrix materials through a molding process such as winding, molding, or pultrusion. The core clamps 140 made of the fiber-reinforced composite materials are low in cost and light in weight and have good mechanical properties, and a manufacturing process of the fiber-reinforced composite materials has low carbon emissions and is greener and more environmentally friendly.
Referring to
The low-voltage insulating layers 122 are made of polyimide impregnated paper. Specifically, the low-voltage insulating layers 122 are made of SHS-P diphenyl ether prepreg material, which is formed by impregnating a polyimide film and a polysulfone fiber nonwoven soft composite material with diphenyl ether resin and baking. Alternatively, the low-voltage insulating layer may also use DMD insulating paper or a silicon rubber film, or other insulating materials, which may be selected according to different temperature rise levels of the dry-type transformer.
Alternatively, the support bar 123 is made of glass fibers impregnated with epoxy resin or aramid fibers impregnated with epoxy resin. Alternatively, the support bar 123 is a long strip with I-shaped cross-section, and has stable mechanical strength. Alternatively, the support bar may also be a long strip with square cross-section or cross-sections in other shapes, provided that the support bar can play roles of support and isolation.
An inner ring layer of the low-voltage winding 120 is further provided with an inner lead copper bar, and an outer ring layer of the low-voltage winding 120 is further provided with an outer lead copper bar. Free ends of the inner lead copper bar and the outer lead copper bar are provided with connecting holes. The connecting holes and the second through holes on the core clamps 140 are correspondingly matched, and then are fastened and connected with each other.
As shown in
The winding portion 1312 includes a plurality of winding plates 1313. The winding plates 1313 are arranged at equal intervals on the outer peripheral surface of the supporting barrel 1311 in a circumferential direction of the supporting barrel 1311. Each winding plate 1313 extends along the axial direction of the supporting barrel 1311. An extension length of the winding plate 1313 along the axial direction of the supporting barrel 1311 is less than that of the supporting barrel 1311 along the axial direction thereof. At least two winding plates 1313 are provided. Alternatively, two, three, four, or more winding plates 1313 may be provided, which is not limited herein. Preferably, the number of winding plates 1313 of a dry-type transformer (such as a 10 kV/1000 kVA dry-type transformer) is set to twelve, so as to ensure reliable winding of a wire and save materials as much as possible. In other embodiments, the extension length of the winding plate along the axial direction of the supporting barrel may also be equal to that of the supporting barrel along the axial direction thereof.
The winding plate 1313 is a rectangular plate, and a longer side of the winding plate 1313 is arranged along the axial direction of the supporting barrel 1311. That is, a length direction of the winding plate 1313 is arranged along the axial direction of the supporting barrel 1311. The winding plate 1313 is further provided with a plurality of winding grooves 1314. The winding grooves 1314 extend along a radial direction of the supporting barrel 1311 and are distributed at intervals along the axial direction of the supporting barrel 1311, so that the winding plate 1313 is comb-shaped. That is, a plurality of comb teeth is formed on the winding plate 1313. Heights of the comb teeth on the winding plate 1313 along the axial direction of the supporting barrel 1311 are defined as tooth heights. Preferably, tooth heights of the comb teeth at two ends of the winding plate 1313 and tooth heights of the comb teeth in the middle of the winding plate 1313 are both greater than tooth heights of the comb teeth in other parts. This is due to uneven field strength at the ends of the high-voltage coil 1320, and a uniform electric field can be achieved by setting greater tooth heights at the two ends of the winding plate 1313. Moreover, taps of a tap wire are required to be led out from the middle of the winding plate 1313. If the tooth heights in the middle of the winding plate 1313 are set to greater values, a distance between corresponding two adjacent winding grooves 1314 is also greater, which may leave placement space for the taps led out from the middle of the winding plate 1313. A comb-tooth region with a greater tooth height is defined as a high comb-tooth region, while a comb-tooth region with a less tooth height is defined as a low comb-tooth region. Through the above configuration, a first high comb-tooth region, a first low comb-tooth region, a second high comb-tooth region, a second low comb-tooth region, and a third high comb-tooth region are sequentially formed on the winding plate 1313 from an end of the winding plate 1313 to the other end of the winding plate 1313 in the length direction of the winding barrel 1311. Further, specific tooth heights of the first high comb-tooth region, the second high comb-tooth region, and the third high comb-tooth region are not limited, which may be the same as or different from one another. Alternatively, the first high comb-tooth region and the third high comb-tooth region may be arranged symmetrically with respect to the second high comb-tooth region, and the first low comb-tooth region and the second low comb-tooth region may also be arranged symmetrically with respect to the second high comb-tooth region, so that the high-voltage coils 1320 are arranged symmetrically in the axial direction of the high-voltage winding 130. In this case, a center of gravity of the high-voltage winding 130 is located at a central position of the high-voltage winding 130, facilitating hoisting and transportation of the high-voltage winding 130. Alternatively, the first high comb-tooth region, the first low comb-tooth region, the second high comb-tooth region, the second low comb-tooth region, and the third high comb-tooth region may also be arranged asymmetrically, which is not limited herein. Alternatively, tooth heights of the comb teeth in each region may also be configured in an equal height or in other manners, which is not limited herein.
At least one coil section is arranged between two adjacent comb teeth on the winding plate 1313, so that a wire is wound in each winding groove 1314, the high-voltage coils 1320 are reasonably distributed and arranged, and the coil sections are spaced apart.
When the winding plates 1313 are arranged at equal intervals on the outer peripheral surface of the supporting barrel 1311 in the circumferential direction of the supporting barrel 1311, two ends of each winding plate 1313 are flush with each other, and the winding grooves 1314 on each winding plate 1313 match in a one-to-one correspondence manner in the circumferential direction of the supporting barrel 1311. For each coil section, the wire is wound in an annular winding groove formed by corresponding winding grooves 1314 on all the winding plates 1313 along the circumferential direction of the supporting barrel 1311, with balanced force and good mechanical strength.
In other embodiments, in order to avoid setting positions of the taps, the winding plates may also be fixed to the outer peripheral surface of the supporting barrel at unequal intervals. That is, a distance between two adjacent winding plates varies. For example, a distance between two adjacent winding plates is greater than that between any other two adjacent winding plates. In this case, each tap may be led out between two adjacent winding plates with a greater distance. In this way, the setting position of each tap can also be reserved without setting greater tooth heights of the comb teeth in the middle of the winding plates.
In other embodiments, the winding plates may also be annular disc members arranged circumferentially around the supporting barrel. The winding plates are spaced apart along the axial direction of the supporting barrel, and the wire is wound in recesses formed by two adjacent winding plates.
Alternatively, the supporting barrel 1311 is a hollow tube formed by winding and curing or pultrusion of glass fibers impregnated with epoxy resin, or a hollow tube formed by pultrusion and winding of glass fibers or aramid fibers impregnated with epoxy resin, or a hollow tube formed by winding and curing or pultrusion of aramid fibers impregnated with epoxy resin, or is made of other composite materials, which is not limited herein.
In an embodiment according to the present disclosure, the supporting barrel 1311 and the winding plate 1313 are two members separately formed and are bonded and fixed. The winding plate 1313 is also made of glass fibers impregnated with epoxy resin. Multi-layer glass fiber cloth is impregnated with epoxy resin and then superimposed to a certain thickness, and molded and cured to form a rectangular glass steel sheet. The glass steel sheet is provided with the winding grooves 1314. Specifically, the winding grooves 1314 may be formed by turning, so as to form the winding plates 1313. The winding plates 1313 are fixedly connected to the outer peripheral surface of the supporting barrel 1311 by an adhesive, thereby saving manufacturing materials and costs to the greatest extent. Alternatively, the adhesive is a two-component high-temperature resistant epoxy adhesive, or the adhesive may also be other adhesives, provided that the supporting barrel 1311 can be firmly bonded with the winding plates 1313 and the adhesive is high-temperature resistant, so as to adapt to high-temperature injection of the high-voltage insulating layer 1330 outside the winding body 1310.
In this embodiment, the winding plate 1313 is molded and cured. In other embodiments, the winding plate may also be integrally cast and cured to directly form a comb-shaped winding plate, which simplifies the process, and materials of the winding plate are the same as those described above. Details are not described again.
In another embodiment according to the present disclosure, the supporting barrel 1311 and the winding plates 1313 are integrally formed. A hollow tube with a large thickness is formed by pultrusion or winding of glass fibers or aramid fibers impregnated with epoxy resin, and then the hollow tube is turned to form the supporting barrel 1311 and the winding plate 1313. In this way, the materials are wasted, but strength between the supporting barrel 1311 and the winding plate 1313 can be ensured, and damages to the connection between the supporting barrel 1311 and the winding plate 1313 due to insecure bonding or subsequent injection of the high-voltage insulating layer 1330 are prevented.
In yet another embodiment according to the present disclosure, referring to
The winding body 1310 is made of the above fiber-reinforced composite material, which has characteristics of a light weight and high strength, so that the winding body 1310 has good mechanical strength, can effectively support the winding of the wire, is not prone to damages, and prevents scattering and displacement of the wire by injection impact force generated when high-temperature vulcanized silicone rubber is injected outside the winding body 1310. Moreover, the fiber-reinforced composite material has good heat resistance, preventing deformation of the winding body 1310 due to excessive heat generated by the high-voltage coil 1320 during the operation of the dry-type transformer 10.
Referring to
In an embodiment according to the present disclosure, referring to
The second wire is wound from the middle of the winding portion 1312 along the axial direction of the supporting barrel 1311 to the second end of the winding portion 1312, and three other taps are led out form the second wire. Specifically, the second wire starts to be wound in an annular winding groove formed by next winding groove 1314 adjacent to the tap 2 to form a third coil section 1323. The second wire is continuously wound to the second end of the winding portion 1312 in a same manner as the first wire. Three other taps, i.e., the tap 3, the tap 5, and the tap 7, are respectively led out from three coil sections starting from the third coil section 1323, until the second wire is wound to an annular winding groove formed by the final winding groove 1314 on each winding plate 1313 at the second end of the winding portion 1312, so as to form the final coil section 1324. An end of an outer-turn wire of the second wire located at the second end of the winding portion 1312 forms a second external terminal X exposed to the outside of the high-voltage insulating layer 1330. That is, the second external terminal X is led out from the end of the outer-turn wire of the terminal coil section 1324 (i.e., a tail end of the second wire). So far, the winding of the second wire has been completed.
During the winding, the wire is wound in annular winding grooves formed by the winding grooves 1314 on all the winding plates 1313, so that each coil section formed by the winding of the wire is perpendicular to the axial direction of the supporting barrel 1311, it is convenient for the winding, and the wire is arranged orderly. The winding plates 1313 and the supporting barrel 1311 are evenly stressed and have good mechanical strength.
In this way, a disc high-voltage coil 1320 is formed. The coil structure has good mechanical strength, and has strong bearing capability for electric power generated by a short-circuit current, which has more discs and better heat dissipation capability than a layer coil. Moreover, in the axial direction of the supporting barrel 1311, referring to
The wire is wound on the winding body 1310 to form the high-voltage coil 1320. Therefore, the high-voltage coil 1320 is ring-shaped. If a ring width of the high-voltage coil 1320 is defined as a width of the high-voltage coil 1320, widths of the high-voltage coil 1320 in various radial sections are identical. That is, an outer side face of the high-voltage coil 1320 is equidistant from the outer peripheral surface of the supporting barrel 1311, so that the overall force of the high-voltage coil 1320 is balanced. Alternatively, in consideration of an actual operation, the widths of each coil on the radial sections thereof may not be exactly the same, provided that the widths are roughly the same.
In this embodiment, the second wire starts to be wound from an annular winding groove formed by next winding grooves 1314 adjacent to the tap 2 to a winding annular groove formed by the final winding grooves 1314 at the second end of the winding portion 1312. In other embodiments, the second wire may also start to be upwards wound from the annular winding groove formed by the final winding grooves at the second end of the winding portion to the annular winding groove formed by next winding grooves adjacent to the tap 2, but only the second external terminal X is formed first, and then the tap 7, the tap 5, and the tap 3 are sequentially formed. Certainly, the manner of winding the high-voltage coil 1320 is not limited to the above manners, and a disc coil or layer coil may also be formed in other manners, provided that the high-voltage winding 130 can be finally formed.
In this embodiment, the tap changer includes six taps. In this case, the dry-type transformer 10 has five gears for regulating the voltage. In other embodiments, the tap changer may include four taps. That is, the first tap changer and the second tap changer include two taps respectively. In this case, the dry-type transformer includes three gears for regulating the voltage, provided that the voltage is in line with an actual use requirement of the dry-type transformer, which is not limited herein.
As shown in
The high-temperature vulcanized silicone rubber according to the embodiment of the present disclosure is a high-temperature vulcanized silicone rubber material system, specifically including raw rubber, reinforcing agent, flame retardant, heat resistant agent, and other auxiliary materials.
After the high-temperature vulcanized silicone rubber is wrapped around the high-voltage coil 1320 and the winding body 1310 by integral vacuum injection, the high-temperature vulcanized silicone rubber fills the gaps between the high-voltage coil 1320 and the winding body 1310 and is wrapped around the two ends of the winding body 1310, and the high-temperature vulcanized silicone rubber is not wrapped around an inner wall of the supporting barrel 1311, so that the high-voltage winding 130 is in the shape of a hollow column as a whole. Alternatively, the high-voltage winding 130 may be a hollow cylinder, a hollow elliptical column, or other hollow columns.
Prior to the integral injection of the high-temperature vulcanized silicone rubber, the six taps are connected by arranging a tooling connector 101 to avoid that the six taps are also wrapped with the silicone rubber during the injection and cannot be used for wiring. As shown in
Two opposite side faces of the tooling connector 101 are further provided with two symmetrical connection grooves 1012. An injection mold is correspondingly provided with two connection blocks. When the tooling connector 101 is placed in the injection mold, the connection grooves 1012 on the tooling connector are clamped and connected to the two connection blocks on the injection mold respectively to fix the tooling connector 101 in the injection mold, so as to prevent shift of the position of the tooling connector 101 due to large injection pressure during the injection of the silicone rubber.
In other embodiments, alternatively, the two opposite side faces of the tooling connector may be provided with two symmetrical connection blocks, and the injection mold is correspondingly provided with two connection grooves. When the tooling connector is placed in the injection mold, the connection blocks on the tooling connector are clamped and connected to the connection grooves on the injection mold respectively to fix the tooling connector in the injection mold, so as to prevent shift of the position of the tooling connector due to large injection pressure during the injection of the silicone rubber. After the high-voltage insulating layer 1330 is formed by integral injection, a side face of the tooling connector 101 is wrapped with a small amount of silicone rubber. Since amount of silicone rubber wrapped on the tooling connector 101 is wrapped relatively small, the tooling connector 101 can be directly removed with a tool to expose the first tap changer and the second tap changer, so as to finally form the high-voltage winding 130 as shown in
In this embodiment, one tooling connector 101 is provided. In other embodiments, two tooling connectors may also be provided. In this case, the tooling connectors are of a smaller size, each tooling connector is provided with three stepped holes, and the six taps are connected to the six stepped holes respectively, which is not limited herein.
In this embodiment, as shown in
In another embodiment, as shown in
In yet another embodiment, as shown in
Since a width of the winding groove 3314 along the axial direction of the supporting barrel 3311 is relatively large, each coil section is arranged in a spiral shape along the axial direction of the winding plate 3313, and a length of each coil section along the axial direction of the winding plate 3313 is greater than a sum of widths of two parallel wires, so as to form a multi-section cylindrical high-voltage coil 3320. Compared with the disc structure formed by winding with the double-winding continuous winding method (i.e., the structure of the high-voltage coil 2320 in the foregoing embodiment), the high-voltage coil 3320 is more compact and fewer winding grooves 3314 are provided in the high-voltage winding of the same specification, so that the usage amount of the wire is less, thereby further achieving the purpose of reducing the costs.
In this embodiment, through the arrangement of the winding plates 3313, the first coil section 3321 and the second coil section 3322 are separated by comb teeth. In other embodiments, the winding plates may not be provided, a gap is provided between the first coil section and the second coil section, and the high-voltage coil is finally fixed by filling with the high-voltage insulating layer, which can also achieve a purpose of insulating the high-voltage coil sections.
In another embodiment, as shown in
The interlayer insulating layer 4301 may be made of mesh cloth, or insulation braces circumferentially spaced apart, or made of other hard insulating materials. Moreover, the insulation braces are long insulation strips with wavy edges, which can prevent damages to the insulation braces due to extremely high injection pressure when the high-temperature vulcanized silicone rubber is injected to form the high-voltage insulating layer. Besides, the insulation braces are made of hard insulating materials, which can resist the impact during high-temperature injection of the silicone rubber. One, two, or three interlayer insulating layers 4301 may be provided, depending on different designs, which is not limited herein. In an embodiment of the present disclosure, referring to
A longer side of the winding plate 5313 is arranged along the axial direction of the supporting barrel 5311. Winding grooves 5314 are arranged along the radial direction of the supporting barrel 5311 and are spaced apart along the axial direction of the supporting barrel 5311, so that a plurality of comb teeth is formed on the winding plate 5313. The first slot 53131 is located on the winding plate 5313 and faces away from the winding groove 5314. That is, the first slot 53131 is arranged along the radial direction of the supporting barrel 5311, and the first slot 53131 is located on a side face of the winding plate 5313 close to the supporting barrel 5311, so that the auxiliary member 5316 protruding from the outer peripheral surface of the supporting barrel 5311 can be clamped in the first slot 53131. The auxiliary member 5316 can maintain stable arrangement of the winding plate 5313, preventing displacement and dislocation of the winding plate 5313 during the winding of the wire and the injection of the high-voltage insulating layer.
The first slot 53131 is located in the middle of the winding plate 5313, and in the radial direction of the supporting barrel 5311, the first slot 53131 extends from a side of the winding plate 5313 close to the supporting barrel 5311 to a comb tooth in the middle of the winding plate 5313. Alternatively, in the radial direction of the supporting barrel 5311, the first slot 53131 is flush with the comb tooth in the middle of the winding plate 5313, but does not extend onto the comb tooth. On one hand, the influence on mechanical strength of the winding plate 5313 and even breakage of the winding plate 5313 due to the arrangement that the first slot 53131 is flush with the winding groove 5314 are prevented. On the other hand, a tooth height of the comb tooth in the middle of the winding plate 5313 is large, which can further reduce the influence of the first slot 53131 on the mechanical strength of the winding plate 5313. Further, a slot depth of the first slot 53131 in the radial direction of the supporting barrel 5311 matches a width of the auxiliary member 5316 protruding from the supporting barrel 5311, so that after the auxiliary member 5316 is assembled with the winding plate 5313, an outer side of the auxiliary member 5316 is closely attached to an inner side of the first slot 53131, with good mechanical strength and reliable fastening. If the slot depth of the first slot 53131 is less than the width of the auxiliary member 5316 protruding from the supporting barrel 5311, there is a gap between the winding plate 5313 and the supporting barrel 5311, which may cause a risk that the winding plate 5313 may bend around the auxiliary member 5316 during the winding of the wire and the injection of the high-voltage insulating layer. If the slot depth of the first slot 53131 is greater than the width of the auxiliary member 5316 protruding from the supporting barrel 5311, there is a gap between the first slot 53131 and the auxiliary member 5316, the auxiliary member 5316 cannot play a role of fastening.
The auxiliary member 5316 is made of glass fibers impregnated with epoxy resin. First, a disc member with a certain thickness is formed by molding, and then the auxiliary member 5316 is fixedly connected to the outer peripheral surface of the supporting barrel 5311 by an adhesive, so as to save materials and costs to the greatest extent. Alternatively, the auxiliary member may also be integrally formed with the supporting barrel, that is, a hollow tube with a large thickness is made first, and then the hollow tube is turned to form the winding plate 5313 and the auxiliary member 5316 at the same time.
In this embodiment, an auxiliary member 5316 and one group of first slots 53131 are provided. In other embodiments, a plurality of, such as two or three, auxiliary members may be provided. Correspondingly, a plurality of, such as two or three, groups of first slots may be spaced apart along the axial direction of the supporting barrel. In such embodiments, various groups of auxiliary members and first slots are spaced apart along the axial direction of the supporting barrel, which effectively evenly distributes bearing strength of the winding plate, making the structure of the winding plate more stable. For example, in an embodiment, the outer peripheral surface of the supporting barrel is provided with an auxiliary member at each of the middle position and the two ends, and each winding plate is correspondingly provided with three first slots.
In an embodiment according to the present disclosure, referring to
In other embodiments, as shown in
Specifically, the winding body includes a winding portion 7310 and a plurality of auxiliary members 7312, the winding portion 7310 includes a plurality of comb-shaped winding plates 7311. The auxiliary members 7312 are ring-shaped and spaced apart along axial directions of the auxiliary members 7312. The winding plates 7311 are fixed to peripheries of the plurality of auxiliary members 7312 along the axial directions of the auxiliary members 7312. Each winding plate 7311 is connected to all the auxiliary members 7312 at the same time. The winding plates 7311 are evenly distributed along circumferential directions of the auxiliary members 7312. The axial direction of the auxiliary member 7312 is an axial direction of the winding portion 7310, that is, an axial direction of the high-voltage winding. The auxiliary member 7312 may be in a shape of circular ring or elliptical ring, which may be designed according to an overall shape of the high-voltage winding. The winding plates 7311 are arranged along circumferential directions of the auxiliary member 7312, the wire is wound on the winding portion 7310 to form a high-voltage coil, and the high-voltage coil includes a plurality of coil sections. The coil sections are spaced along the axial direction of the high-voltage winding. The high-voltage insulating layer is wrapped around the high-voltage coil, the plurality of auxiliary members 7312, and the winding plates 7311. The auxiliary member 7312 can maintain stable arrangement of the winding plate 7311, preventing displacement and dislocation of the winding plate 7311 during the winding of the wire and the injection of the high-voltage insulating layer.
In an embodiment, an outer surface of the auxiliary member 7312 is provided with a plurality of third slots 73121. The third slots 73121 are evenly arranged along the circumferential direction of the auxiliary member 7312. The third slots 73121 of the plurality of auxiliary members 7312 are aligned with one another in the axial directions of the auxiliary members 7312 to form a plurality of third slot columns. The number of the third slot columns corresponds to that of the winding plates 7311. Each winding plate 7311 is clamped in one corresponding third slot column, causing the plurality of winding plates 7311 to be circumferentially evenly distributed on peripheries of the plurality of auxiliary members 7312. Further, two ends of all the winding plates 7311 are flush with each other, and the third slots 73121 on all the auxiliary members 7312 match in one-to-one correspondence in the axial directions of the auxiliary members 7312, which enables each winding plate 7311 to be arranged along the axial direction of the auxiliary member 7312, and then causes the wire to be wound in comb teeth on the winding plate 7311 to form a high-voltage coil. That is, the coil sections of the high-voltage coil are spaced apart in the axial direction of the winding portion 7310, with balanced force and good mechanical strength.
Widths of the third slot 73121 in the circumferential directions of the auxiliary member 7312 are defined as slot width of the third slot 73121. The slot width of the third slot 73121 match thicknesses of the winding plate 7311, so that the winding plate 7311 is firmly assembled with the auxiliary member 7312, preventing difficult alignment and fixation of the winding plate 7311 with and to the auxiliary member 7312 when the slot width of the third slot 73121 is less than the thickness of the winding plate 7311, or falling of the winding plate 7311 from the auxiliary member 7312 when the slot width of the third slots 73121 is greater than the thickness of the winding plate 7311. The winding plate 7311 is fixedly connected to the third slot 73121 by an adhesive. The adhesive is a two-component high-temperature resistant epoxy adhesive, which may also be other adhesives, but there is a need to ensured that the adhesive enables a firm bonding between the winding plate 7311 and the auxiliary member 7312. Besides, the adhesive is required to be high-temperature resistant, so as to adapt to the wrapping of the high-voltage insulating layer around the winding plate 7311 and the auxiliary member 7312 by high-temperature injection.
In other embodiments, the slot may also be arranged on side faces of the winding plate close to the auxiliary member, and the auxiliary member is clamped in the slot of the winding plate, so that the winding plate is fixedly connected to the auxiliary member. Preferably, as in the foregoing embodiment, the auxiliary member 7312 is provided with the third slot 73121, which prevents weakening of the mechanical strength of the winding plate due to the arrangement of the slot on the winding plate.
Still referring to
The winding plate 7311 and the auxiliary member 7312 are both made of glass fibers impregnated with epoxy resin. Several layers of glass fiber cloth impregnated with epoxy resin are superimposed to a certain thickness, and molded and cured to form glass steel. In this embodiment, the winding plate 7311 and the auxiliary member 7312 are separately formed and then bonded and fixed. In other embodiments, the winding plate and the auxiliary member may also be integrally formed.
In another embodiment, referring to
The winding portion 8312 includes a plurality of comb-shaped winding plates 8313. The winding plates 8313 are spaced apart and arranged at equal intervals in a circumferential direction of an inner side of the high-voltage winding 830. Each winding plate 8313 is arranged along an axial direction of the high-voltage winding 830. The high-voltage coil 8320 includes a plurality of coil sections. At least one section coil is arranged between two adjacent comb teeth on the winding plate 8313. At least two winding plates 8313 are provided. Alternatively, two, three, four, or more winding plates 8313 may be provided, which is not limited herein.
The winding plate 8313 is further provided with a plurality of winding grooves 8314, so that the winding plate 8313 is comb-shaped. That is, a plurality of comb teeth is formed on the winding plate 8313. The specific structure, material, and molding manner of the winding plate 8313 are the same as those of the foregoing winding plate 1313. Details are not described herein again.
In another embodiment, as shown in
Specifically, the auxiliary member 9316 includes at least one end-portion auxiliary member 93161. The end-portion auxiliary member 93161 is arranged on outer sides of end portions of the winding plates 9313, which can maintain stable arrangement of the winding plates 9313 without affecting the winding of the wire. Referring to
In this embodiment, outer sides of two end portions of the winding plate 9313 are each provided with the end-portion auxiliary member 93161, so that the two ends of the winding plate 9313 are both fixed by the auxiliary member 9316, which can effectively maintain stable arrangement of the winding plate 9313. In other embodiments, alternatively, only outer side of one end portion of the winding plate is provided with the end-portion auxiliary member.
Referring to
In this embodiment, the auxiliary member 9316 includes two end-portion auxiliary members 93161 and one middle auxiliary member 93162, so that the winding plates 9313 can maintain stable positions during the winding of the wire and the injection of the high-voltage insulating layer 9330, without displacement and dislocation, which prevents discharge caused by an insufficient insulation distance due to two coil sections getting extremely close to each other. In other embodiments, only the end-portion auxiliary member may be provided, or only the middle auxiliary member may be provided, or the auxiliary members may be spaced apart along the axial direction of the high-voltage winding, provided that the winding plates can be reinforced.
The auxiliary member 9316 is also made of glass fibers impregnated with epoxy resin. Several layers of glass fiber cloth impregnated with epoxy resin are superimposed to a certain thickness, and then molded and cured to form a ring-shaped glass steel sheet. The auxiliary member 9316 may be in a shape of a circular ring, an elliptical ring, or other rings. A thickness of the end-portion auxiliary member 93161 is required to be less than tooth heights of two ends of the winding plate 9313. When there is no requirement for the thickness of the middle auxiliary member 93162, the ring width of the middle auxiliary member 93162 is required to be less than widths of non-comb-tooth parts of the winding plate 9313, that is, an overall width of the winding plate 9313 minus the width of the winding groove 9314 of the winding plate 9313. Alternatively, when there is no requirement for the ring width of the middle auxiliary member 93162, the thickness of the middle auxiliary member 93162 is required to be less than tooth heights of the comb teeth in the middle of the winding plate 9313. Such arrangement prevents the influence on the winding of the wire on the winding plate 9313 due to occupation of the winding groove 9314 by the auxiliary member 9316.
Alternatively, the auxiliary member 9316 and the winding plate 9313 are separately molded and then bonded and fixed, or the auxiliary member 9316 and the winding plate 9313 are integrally formed.
The wire is wound circumferentially on outer peripheral surfaces of the winding plates 9313 to form the high-voltage coil 9320 (refer to
The dry-type transformer according to the embodiments of the present disclosure has at least the following beneficial effects. Different from the prior art, the high-voltage winding of dry-type transformer of the present disclosure includes a winding body, a high-voltage coil, and a high-voltage insulating layer made of injection-molded silicone rubber. Compared with the epoxy resin high-voltage insulating layer in the prior art, the high-voltage insulating layer made of injection-molded silicone rubber has the following advantages. 1) It has good fire resistance, low temperature resistance, aging resistance, and short circuit resistance, which can prolong the service life of the dry-type transformer. 2) The copper coil is easy to peel off from the silicone rubber, and thus, a material recovery rate is greater than 99%, which is more environmentally friendly. 3) On one hand, the silicone rubber elastomer can reduce incentives of partial discharge caused by mechanical vibration, and have an inhibitory effect on device discharge; moreover, a product of the silicone rubber under discharge is non-conductive silicon dioxide, which can effectively inhibit continuous deterioration of insulation. On the other hand, after assembly, various components can realize vibration-reducing connection through the silicone rubber elastomer, which can greatly reduce vibration and noise. 4) It can reduce operation losses of the transformer, and is more energy-efficient. 5) Silicone rubber has hydrophobicity and migration of hydrophobicity, and has good electric corrosion resistance and flame retardant effects. Silicone rubber is also used as an H-class insulating material with good insulating properties, and thus, it has good resistance to harsh environments and can be mounted indoors and outdoors. At the same time, the silicone rubber of the present disclosure is molded by integral high-temperature vulcanization injection. This process makes the high-voltage insulating layer more stable, with higher mechanical properties and better adhesion to the high-voltage coil and the winding body, which can effectively prolong the service life of the high-voltage insulating layer. Moreover, silicone rubber fillers for injection of the present disclosure are evenly distributed, which may not cause partial discharge of the dry-type transformer due to agglomeration of the fillers, so that the overall performance of the dry-type transformer is better.
Referring to
In step 1000, the wire is wound circumferentially along the outer peripheral surface of the winding body 1310 to form the high-voltage coil 1320, and taps are formed during the winding of the wire.
The specific structure, material, and molding method of the winding body 1310 are all as described above. Details are not described again.
The winding body 1310 is sleeved on a winding device, and the wire is wound on the winding body 1310, so that the high-voltage coils 1320 are spaced apart along the axial direction of supporting barrel 1311, so as to form a disc high-voltage coil 1320. The winding manner of the wire and the structures of the high-voltage coil 1320 are consistent with those described above. Details are not described again. Moreover, during the winding of the wire, a tap 2, a tap 3, a tap 4, a tap 5, a tap 6, and a tap 7 are led out respectively, so as to form a tap changer.
In other embodiments, the wire may also be wound into a double-winding continuous high-voltage coil 2320, a multi-section cylindrical high-voltage coil 3320, and a segmented cylindrical high-voltage coil 4320 as shown in
In step 1100, the taps are disposed in a protective chamber of a tooling connector 101 and are connected and fixed to the tooling connector 101.
Through the tooling connector 101 shown in
In step 1200, the winding body 1310 around which the high-voltage coil 1320 is wound is put into a mold of an injection molding machine as a to-be-injected body, high-temperature vulcanized silicone rubber is integrally injected on a periphery of the to-be-injected body, so that the high-temperature vulcanized silicone rubber is wrapped around the high-voltage coil 1320 and the winding body 1310.
Prior to step 1200, the six stepped holes 1011 of the tooling connector 101 are all connected to bolts. In this way, the bolts can directly fill the remaining space of the stepped holes 1011, preventing filling of the six stepped holes 1011 with the silicone rubber, so as to avoid that the six taps are wrapped with the silicone rubber and cannot be used for wiring.
The winding body 1310 and the high-voltage coil 1320 connected with the tooling connector 101 are used as the to-be-injected body. Then, after the periphery of the to-be-injected body is coated with a coupling agent, the to-be-injected body is put into the mold of the injection molding machine, silicone rubber raw materials are added, and the high-temperature vulcanized silicone rubber is integrally injected on the periphery of the to-be-injected body, and the high-voltage winding 130 is obtained after cooling. The high-voltage insulating layer 1330 made of the high-temperature vulcanized silicone rubber improves insulation and mechanical properties of the high-voltage winding 130.
After the high-temperature vulcanized silicone rubber is wrapped around the high-voltage coil 1320 and the winding body 1310 by integral vacuum injection, the high-temperature vulcanized silicone rubber fills the gaps between the high-voltage coil 1320 and the winding body 1310 and is wrapped around the two ends of the winding body 1310. The high-temperature vulcanized silicone rubber is not wrapped around an inner wall of the supporting barrel 1311, making the high-voltage winding 130 as a whole in the shape of a hollow column, which may be a hollow cylinder, a hollow elliptical column, or other hollow columns. In other embodiments, the high-voltage coil 1320 and the winding body 1310 may also be wrapped with other injection-molded silicone rubber such as liquid silicone rubber for injection.
In step 1300, the tooling connector 101 is removed to obtain the high-voltage winding 130 with the taps exposed to the outside of the high-temperature vulcanized silicone rubber.
After the high-voltage insulating layer 1330 is formed by vacuum injection, a side face of the tooling connector 101 is wrapped with a small amount of silicone rubber. Since the tooling connector 101 is wrapped with a relatively small amount of silicone rubber, the tooling connector 101 can be directly removed with a tool to expose the taps, so as to finally form the high-voltage winding 130 as shown in
Referring to
In step 2000, a high-temperature resistant film (not shown in figures) is pasted on an outer peripheral surface of a winding tool 90.
As shown in
The high-temperature resistant film is fixed to the outer peripheral surface of the mold 91 by a high-temperature resistant polyimide tape or other high-temperature resistant tapes, so that the high-voltage winding 930 after the injection of the high-temperature vulcanized silicone rubber can be easily demoulded. In order to better bond the wire to the high-temperature vulcanized silicone rubber, the wire may be coated with a coupling agent. Moreover, in the prior art, in order to facilitate the demoulding after the injection, the mold may generally be coated with a demoulding agent. However, the coupling agent and the demoulding agent may react chemically at high temperatures, affecting the performance of the high-voltage winding 930. In order to avoid this situation and facilitate the demoulding, the demoulding agent is replaced with the high-temperature resistant film in the present disclosure.
Those skilled in the art should know that the high-temperature resistant film is a film that can withstand high temperatures of at least 105° C. Since the injection molding machine is generally at a temperature of 105° C. or above during the injection, the high-temperature resistant film has to be guaranteed not to be damaged at the highest injection temperature. It may be, for example, a fluorinated ethylene propylane (FEP) film. The FEP film is a high-temperature resistant isolation film, which has high and low temperature resistance from −200° C. to 200° C., low friction, non-stick performance and lubricity, chemical corrosion resistance, thermal stability, and electrical insulation, and may not be damaged at the highest injection temperature. In addition, a high-temperature resistant film such as a polyimide film may also be used, provided that it may not be damaged at the highest injection temperature. Obviously, films resistant to higher temperatures may also be used.
Since the high-voltage winding 930 does not include the rigid insulating liner barrel, the shape of the inner peripheral surface the high-voltage winding 930 matches the shape of the outer peripheral surface of the mold 91. By changing the size and shape of the mold 91 of the winding tool 90, high-voltage windings 930 with different inner diameters and inner peripheral shapes can be produced.
In step 2100, the winding portion 9312 is fixed to the high-temperature resistant film, and an auxiliary member 9316 is mounted to enable the auxiliary member 9316 to stably fasten the winding portion 9312.
In an embodiment according to the present disclosure, the auxiliary member 9316 includes a middle auxiliary member 93162. The middle auxiliary member 93162 is sleeved outside the high-temperature resistant film on the winding tool 90. Referring to
Then, the winding portion 9312 is arranged along the circumferential direction of the winding tool 90 to enable an inner wall of the middle auxiliary member 93162 to be flush with an inner wall of the winding portion 9312. The winding portion 9312 is bonded to the high-temperature resistant film along the circumferential direction of the winding tool 90 by an adhesive. The winding portion 9312 is provided with a plurality of winding grooves 9314 configured to subsequently wind the wire.
Referring to
In an embodiment according to the present disclosure, the auxiliary member 9316 includes an end-portion auxiliary member 93161. The winding portion 9312 is first arranged circumferentially along the circumferential direction of the winding tool 90, and then the end-portion auxiliary member 93161 is fixed to an outer side of an end portion of the winding portion 9312. The end-portion auxiliary member 93161 is coaxial with the winding tool 90.
Referring to
The above-mentioned adhesive is a two-component high-temperature resistant epoxy adhesive, which may certainly also be other adhesives, but it should be ensured that the adhesive enables a firm bonding of the middle auxiliary member 93162 and the end-portion auxiliary member 93161 to the winding portion 9312. The firm bonding is high-temperature resistant, so as to adapt to the wrapping of the high-voltage insulating layer 9330 around peripheries of the winding portion 9312 and the auxiliary member 9316 by high-temperature injection.
Further, the auxiliary member 9316 includes two end-portion auxiliary members 93161. The two end-portion auxiliary members 93161 are respectively bonded to outer sides of two end portions of the winding portion 9312, and the end-portion auxiliary members 93161 are coaxial with the winding tool 90.
In an embodiment according to the present disclosure, the auxiliary member 9316 includes a middle auxiliary member 93162 and two end-portion auxiliary members 93161. The middle auxiliary member 93162 is sleeved on the outer peripheral surface of the mold 91, and then the plurality of winding plates 9313 is fixed to an outer surface of the winding tool 90 to enable the middle auxiliary member 93162 to be engaged in the fourth slot 93131, and then the two end-portion auxiliary members 93161 are respectively bonded to outer sides of two end portions of the winding portion 9312 to enable the end-portion auxiliary members 93161 to be embedded in the recess 9317. In other embodiments, the middle auxiliary member and the end-portion auxiliary member may be first bonded and fixed to the winding portion and then are sleeved on and are fixed to the winding tool.
In step 2200, the wire is wound on the winding portion 9312 to form the high-voltage coil 9320 with a tap changer.
In step 2300, referring to
In step 2400, the high-voltage winding 930 is demoulded from the winding tool 90.
The winding tool 90 is separated from the high-voltage winding 930 to complete the demoulding, and a demoulding manner is a common manner in the industry. Details are not described again.
In an embodiment according to the present disclosure, subsequent to step 2400, the method further includes:
step 2500: trimming burrs of the high-temperature resistant film remaining on an inner surface of the high-voltage winding 930 to prevent partial discharge from occurring on the burrs.
In other embodiments, if no burrs remain on the inner surface of the high-voltage winding, there is no need to implement step 2500. Alternatively, in step 2500, the residual high-temperature resistant film may be removed by tearing to keep the inner wall of the high-voltage winding clean and smooth.
The method for manufacturing the high-voltage winding 930 in the present disclosure has simple steps, and the required winding tool 90 has a simple structure and is easy to manufacture. Moreover, the high-voltage winding 930 manufactured with the method omits the rigid insulating liner barrel, so that the high-voltage winding 930 has a better heat conduction effect. Moreover, there is no interface between the high-voltage insulating layer 9330 and the rigid insulating liner barrel. Thus, there is no discharge on the surface of the rigid insulating liner barrel, saving materials and reducing costs.
The technical contents and features of the present disclosure are already disclosed as above. However, it should be appreciated that as guided by the creation idea of the present disclosure, those skilled in the art can make various modifications and improvements to the above structures and materials, including combinations of technical features individually revealed herein or sought for protection, obviously including other combinations of these features. These variations and/or combinations all fall within the technical field to which the present disclosure relate to and fall within the protection scope of claims of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202111644185.6 | Dec 2021 | CN | national |
| 202111644257.7 | Dec 2021 | CN | national |
| 202111647803.2 | Dec 2021 | CN | national |
| 202111647805.1 | Dec 2021 | CN | national |
This application is a national stage for International Application PCT/CN2022/142704, filed on Dec. 28, 2022, which claims the priority benefit of Chinese Patent Application No. 2021116478032, filed on Dec. 29, 2021, Chinese Patent Application No. 2021116441856, filed on Dec. 29, 2021, Chinese Patent Application No. 2021116478051, filed on Dec. 29, 2021, and Chinese Patent Application No. 2021116442577, filed on Dec. 29, 2021. The entireties of these applications are incorporated by reference herein for all purposes.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2022/142704 | 12/28/2022 | WO |
