High-voltage winding

Abstract

The high-voltage winding comprises a winding body, a high-voltage coil and a high-voltage insulating layer, the winding body comprises a winding plate and a fixing ring, and a first mounting hole and a second mounting hole are formed in the fixing ring; the high-voltage winding further comprises a supporting ring, a third installation hole is formed in the supporting ring, and the first installation hole, the second installation hole and the third installation hole are used for being matched with the air channel piece in a penetrating mode. The high-voltage winding further comprises a plurality of air channels, and the air channels are arranged in the axial direction of the high-voltage winding and penetrate through the high-voltage insulating layer. The high-voltage winding is a high-voltage encapsulated cake type winding, and the axial air passages are arranged in the high-voltage winding, so that the high-voltage winding can dissipate heat through the axial air passages on the inner surface, the outer surface and the inner part of the high-voltage winding, the heat dissipation efficiency is improved, and the high-voltage winding can be applied to a high-capacity dry-type transformer with higher heat dissipation requirements; and the application range is wider.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transformers, in particular to a high-voltage winding. BACKGROUND

[0002] The high-voltage enclosed winding of the dry-type transformer usually only has inner and outer surfaces as heat dissipation areas, and the heat dissipation efficiency is low, which leads to easy overheating of the high-voltage winding during operation, affecting the performance stability and service life thereof. At present, the common way to improve the heat dissipation performance of the high-voltage winding is to set a heat dissipation air channel inside the high-voltage winding. The high-voltage winding can be generally divided into two categories according to the coil structure: layer-type winding and pie-type winding.

[0003] Among them, the layer-type winding adopts a segmented winding method, and the air channel setting technology thereof is relatively mature, that is, the wire is first wound on the winding body at a plurality of preset positions according to a predetermined number of turns and then cut off to obtain a plurality of coil segments, and the predetermined number of turns is less than a full number of turns; then a plurality of air channel rods are arranged on the outer periphery of each coil segment along the axial direction; then the wire of each coil segment is wound to the full number of turns according to the above method, and the wires on the inner and outer sides of each coil segment are welded, thereby obtaining a high-voltage coil; finally, after forming a high-voltage insulation layer, the air channel rods are pulled out to form a heat dissipation air channel.

[0004] The pie-type winding generally adopts a continuous winding method, that is, after a pie coil is wound according to the full number of turns, the wire is not cut off and is continuously wound to the next pie coil, and the winding is completed until all the coils are wound. Since the number of wire segments of the pie-type winding is much larger than that of the layer-type winding, if the above method is used to manufacture the heat dissipation air channel, the wires on the inner and outer sides of each pie coil air channel rod need to be welded, and the welding reliability is greatly reduced; and the gap between adjacent two pie coils is small, and the wire welding is difficult. Therefore, it is difficult to dissipate heat by setting an air channel for the pie-type winding. At present, the existing pie-type winding generally adopts the method of increasing the cross-sectional area of the high-voltage coil wire to reduce the current density of the wire, so as to reduce the resistance loss and heat generation, but this method requires more wire, which increases the material cost; and the cross-sectional area of the high-voltage coil is increased, which further leads to an increase in the volume of the dry-type transformer and an increase in the overall material cost. CONTENT OF THE INVENTION

[0005] In view of the deficiencies of the prior art, the main purpose of the present application is to provide a high-voltage winding, which is stable in structure, conducive to controlling temperature rise, improves heat dissipation efficiency, and realizes the application of pie-type winding in large-capacity products.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is: a high-voltage winding, comprising a winding body, a high-voltage coil and a high-voltage insulation layer, the winding body comprises a plurality of winding plates and a plurality of fixing rings, the winding plates are connected with the fixing rings by clamping, and the fixing rings are provided with a plurality of first mounting holes and a plurality of second mounting holes; the wires are wound on the winding body to form the high-voltage coil, the high-voltage coil comprises a plurality of pancake coils, and the high-voltage insulation layer wraps the high-voltage coil and the winding body; the high-voltage winding further comprises a plurality of support rings, the plurality of support rings are clamped inside the high-voltage coil, the support rings are provided with a plurality of third mounting holes, and the first mounting holes, the second mounting holes and the third mounting holes are used to cooperate with the air passage piece; the high-voltage winding further comprises a plurality of air passages, and the air passages are arranged along the axial direction of the high-voltage winding and penetrate through the high-voltage insulation layer.

[0007] Among them, a plurality of comb teeth are arranged on the winding plate, and the plurality of winding plates are uniformly distributed along the circumference of the high-voltage winding, and at least one pancake coil is arranged between the adjacent two comb teeth on the winding plate.

[0008] Among them, the plurality of fixing rings comprise two first fixing rings, and the plurality of winding plates are correspondingly provided with two first clamping grooves, and the two first fixing rings are clamped at both ends of the winding plate through the first clamping grooves.

[0009] Among them, the plurality of fixing rings comprise at least one second fixing ring, and the plurality of winding plates are correspondingly provided with at least one fifth clamping groove, and the second fixing ring is clamped at the middle of the winding plate through the fifth clamping groove.

[0010] Among them, the support ring is a ring structure with a bevel opening, and the support ring is made of elastic insulating material.

[0011] Among them, the support ring comprises two half-ring assemblies, the two half-ring assemblies are butt-jointed to form the support ring, one end of the two half-ring assemblies is butt-jointed to form a bevel opening, and the other end is butt-jointed to form a flat opening, and the support ring is made of solid insulating material.

[0012] Among them, the direction of the bevel opening is the same as the winding direction of the wires of the high-voltage coil.

[0013] Among them, the cross section of the air passage piece is in the shape of a capsule or a circular-angled trapezoid, the shape and size of the first mounting hole, the second mounting hole and the third mounting hole correspondingly match the cross section of the air passage piece; one end of the air passage piece gradually decreases in outer diameter size in the axial direction of the air passage piece away from the air passage piece.

[0014] Among them, the outer periphery of the air passage piece is provided with a lubricating layer, and the lubricating layer is made of a release agent.

[0015] Among them, the outer periphery of the lubricating layer of the air passage piece is wrapped with flexible insulating material, and the flexible insulating material is silica gel cloth or electrical composite material.

[0016] The application has the advantages that: compared with the prior art, the high-voltage encapsulated disc winding of the application is internally provided with an axial air channel, so that the structure can dissipate heat through the inner surface, the outer surface and the internal axial air channel, and the heat dissipation efficiency is higher, so that the high-voltage winding can be applied to a large-capacity dry-type transformer with higher heat dissipation requirements, and the application range is wider; and compared with the heat dissipation mode of increasing the cross-sectional area of the high-voltage coil wire, the amount of wire is reduced, and the product cost is reduced.

[0017] Meanwhile, the winding body of the application adopts a fixed ring to clamp a winding plate, install a support ring and an air channel piece, the structure is simple and stable, and can avoid movement and misplacement of the winding plate and the air channel piece during the wire winding process and the high-voltage insulation layer injection process, thereby affecting the quality of the high-voltage winding.

[0018] In addition, the wire in contact with both sides of the air channel piece is coated with a flexible insulating material, so that after the air channel piece is pulled out to form an air channel, the wire in the air channel will not be exposed to the air, which is beneficial to prolong the service life of the high-voltage winding. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort. Among them:

[0020] Figure 1 is a front view of a dry-type transformer 10 of an embodiment of the application;

[0021] Figure 2 is a top view of a dry-type transformer 10 of an embodiment of the application;

[0022] Figure 3 is a front view of an assembled iron core 110 of an embodiment of the application;

[0023] Figure 4 is an enlarged view of G in Figure 2

[0024] Figure 5 is a perspective view of a high-voltage winding 130 of an embodiment of the application;

[0025] Figure 6 is a perspective view of a high-voltage coil 1320 wound on a winding body 1310 of an embodiment of the application;

[0026] Figure 7 is a perspective view of a winding plate 1311 of an embodiment of the application;

[0027] ​Figure 8 is a circuit diagram of a high-voltage coil 1320 according to an embodiment of the present application;

[0028] Figure 9 is a perspective view of a winding body 1310 according to an embodiment of the present application;

[0029] Figure 10 is a perspective view of a first fixing ring 1410 according to an embodiment of the present application;

[0030] Figure 11 is a perspective view of a second fixing ring 1420 according to an embodiment of the present application;

[0031] Figure 12 is a perspective view of a support ring 1340 according to an embodiment of the present application;

[0032] Figure 13 is a perspective view of a support ring 1340 according to another embodiment of the present application;

[0033] Figure 14 is a perspective view of a winding body 1310 according to an embodiment of the present application being set in a mold assembly 200;

[0034] Figure 15 is a perspective view of a fixing plate 230 according to an embodiment of the present application;

[0035] Figure 16 is a schematic view of a wire being wound to form a first cake-shaped coil according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, any other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0037] As shown in Figures 1-3 , the dry-type transformer 10 is a three-phase transformer, which includes A phase, B phase and C phase, i.e., the dry-type transformer 10 includes three single-phase transformers 100. According to the structure of the core 110, the three transformers 100 can be arranged to form a linear type or a triangular structure, and the three transformers 100 are in a symmetrical structure. The dry-type transformer 10 can be an isolation transformer, a frequency conversion transformer, a test transformer, etc.

[0038] In an embodiment, continuing to refer to Figures 1-3The three transformers 100 are arranged in a linear structure, and the dry-type transformer 10 comprises a core 110, three low-voltage windings 120 and three high-voltage windings 130. The core 110, the low-voltage windings 120 and the high-voltage windings 130 are arranged in sequence from inside to outside. The core 110 comprises three columnar core bodies 111, an upper yoke 112 located at the upper ends of the three columnar core bodies 111 and a lower yoke 113 located at the lower ends of the three columnar core bodies 111. The three low-voltage windings 120 are respectively sleeved on the outer periphery of the three columnar core bodies 111, and the three high-voltage windings 130 are respectively sleeved on the outer periphery of the three low-voltage windings 120, that is, the three columnar core bodies 111, the three low-voltage windings 120 and the three high-voltage windings 130 are sleeved in sequence from inside to outside in one-to-one correspondence. The columnar core body 111 is formed by stacking a plurality of silicon steel sheets, and the plurality of silicon steel sheets are fixed by binding with a binding tape. The radial cross section of the columnar core body 111 is approximately oval or circular or other shapes, as long as it can be accommodated in the hollow cavity of the low-voltage winding 120, which is not limited herein. The upper yoke 112 and the lower yoke 113 are also formed by stacking a plurality of silicon steel sheets, so that the three columnar core bodies 111 are fixedly connected, thereby forming the core 110.

[0039] An outer side of the core 110 is provided with a core clamp 140, and the core clamp 140 is formed by three clamps being connected with each other to form a structure similar to a channel steel, that is, the core clamp 140 as a whole has a “” character-shaped structure. The clamp located in the middle position is arranged close to the core 110, and the other two clamps are arranged in a direction away from the core 110.

[0040] In combination with Figure 2 and Figure 4The low-voltage winding 120 comprises copper foils 121 and low-voltage insulating layers 122 arranged alternately, and support strips 123. The copper foils 121 are formed by winding a whole copper foil, and the low-voltage insulating layers 122 are wound together after being overlapped with the copper foils 121, so as to realize the alternately arranged copper foils 121 and low-voltage insulating layers 122. At least one heat dissipation air channel is arranged in the low-voltage winding 120, the heat dissipation air channel is located between adjacent copper foils 121 and low-voltage insulating layers 122, and the support strips 123 are located in the heat dissipation air channel and used for supporting the adjacent copper foils 121 and low-voltage insulating layers 122. Specifically, the support strips 123 are insulating support strips 123, which are fixed on the outer surface of the low-voltage insulating layers 122 or the copper foils 121 when the copper foils 121 and the low-voltage insulating layers 122 are overlapped and wound to a fixed number of turns, and the copper foils 121 and the low-voltage insulating layers 122 are continuously overlapped and wound to be close to the insulating support strips 123. The insulating support strips 123 can be fixed between the adjacent copper foils 121 and low-voltage insulating layers 122 in a manner of gluing, or can be fixed by extrusion force generated during winding or other manners. A plurality of insulating support strips 123 are arranged in each heat dissipation air channel, and the plurality of insulating support strips 123 are arranged at intervals along the circumferential surface of the copper foils 121, and simultaneously play a role of supporting the adjacent copper foils 121 and low-voltage insulating layers 122. The insulating support strips 123 arranged in each heat dissipation air channel are at least two, which can be two, three, four or more. Preferably, the plurality of insulating support strips 123 in the same layer are uniformly arranged at intervals along the circumferential surface of the copper foils 121. After the insulating support strips 123 are arranged, the copper foils 121 and the low-voltage insulating layers 122 are continuously overlapped and wound to a predetermined number of turns to form the low-voltage winding 120. The arrangement of the heat dissipation air channel can release the heat generated by the low-voltage winding 120 during the operation of the dry-type transformer 10, and avoid overheating failure of the dry-type transformer 10. The heat dissipation air channel can be arranged in one layer, two layers or more layers, which is not limited here.

[0041] Referring to Figures 5-9 The high-voltage winding 130 comprises a winding body 1310, a high-voltage coil 1320 and a high-voltage insulating layer 1330. The winding body 1310 is arranged circumferentially on the inner side of the high-voltage winding 130, the conductive wire is wound on the outer side of the winding body 1310 to form the high-voltage coil 1320, and the high-voltage coil 1320 comprises a plurality of coil segments, and the plurality of coil segments are arranged at intervals along the axial direction of the high-voltage winding 130. The high-voltage insulating layer 1330 wraps the high-voltage coil 1320 and the winding body 1310. The high-voltage winding 130 is only provided with the winding body 1310, and does not have a rigid insulating inner liner, thereby eliminating the structure of the rigid insulating inner liner, so that the heat dissipation effect of the high-voltage winding 130 is better, there is no interface between the high-voltage insulating layer 1330 and the rigid insulating inner liner, and thus there is no surface discharge of the rigid insulating inner liner, and the material is saved and the cost is reduced.

[0042] In the embodiment, the winding body 1310 includes a plurality of winding plates 1311 and a plurality of fixing rings 1400. The plurality of winding plates 1311 are arranged at intervals and distributed in the circumferential direction on the inner side of the high-voltage winding 130. Each winding plate 1311 is arranged in the axial direction of the high-voltage winding 130, and the winding plate 1311 is provided with a plurality of comb teeth. The high-voltage coil 1320 adopts a pie type coil, that is, includes a plurality of pie type coils, and at least one pie type coil is arranged between any two adjacent comb teeth on the winding plate 1311. The number of winding plates 1311 is at least two, that is, two, three, four or more, which is not limited herein. In order to make the wire winding firm and save materials as much as possible, the number of winding plates 1311 of the 10kV / 1000kVA dry-type transformer is set to twelve.

[0043] The winding plate 1311 is a rectangular plate, and the longer side of the winding plate 1311 is arranged in the axial direction of the high-voltage winding 130. The winding plate 1311 is also provided with a plurality of winding grooves 1312, and the plurality of winding grooves 1312 are arranged in the radial direction of the high-voltage winding 130 and distributed at intervals in the axial direction of the high-voltage winding 130, so that the winding plate 1311 is comb-shaped, that is, a plurality of comb teeth are formed on the winding plate 1311. The height of the comb teeth on the winding plate 1311 in the axial direction of the high-voltage winding 130 is defined as the tooth height. The tooth height at both ends of the winding plate 1311 and the tooth height in the middle of the winding plate 1311 are greater than the tooth height of other parts. This is because the end of the high-voltage coil 1320 needs to withstand high impact voltage. Therefore, the tooth height at both ends of the winding plate 1311 is set to be larger to enhance the impact resistance. The middle of the winding plate 1311 needs to lead out the joint of the tap wire, so the tooth height in the middle of the winding plate 1311 is set to be larger, and the distance between the corresponding adjacent two winding grooves 1312 is larger, which can provide space for the tap joint led out from the middle of the winding plate 1311. At least one pie type coil is arranged between any two adjacent comb teeth on the winding plate 1311, so that the wire is wound in each winding groove 1312. The high-voltage coil 1320 is reasonably distributed and arranged, and each section of the coil is arranged at intervals. At the same time, the region of the comb tooth with slightly larger tooth height is defined as the high comb tooth region, and the region of the comb tooth with slightly smaller tooth height is defined as the low comb tooth region. Then, through the above arrangement, the winding plate 1311 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 to the other end in the axial direction of the high-voltage winding 130. Further, the tooth height of the first high comb tooth region, the second high comb tooth region and the third high comb tooth region is not limited, for example, they can be the same as each other, or different from each other. The first high comb tooth region and the third high comb tooth region can be symmetrically arranged about the second high comb tooth region, and the first low comb tooth region and the second low comb tooth region can also be symmetrically arranged about the second high comb tooth region. Of course, they can also be asymmetrically arranged, which is not limited herein.

[0044] If the several winding plates 1311 are evenly distributed in the circumferential direction, the two ends of all the winding plates 1311 are flush, and the winding grooves 1312 on all the winding plates 1311 are matched one by one in the circumferential direction of the high-voltage winding 130. Each coil is wound by the wire in the corresponding winding groove 1312 on all the winding plates 1311, and the stress is balanced, and the mechanical strength is good.

[0045] In other embodiments, in order to provide a setting position for the tapping, the several winding plates can also be fixed in a non-uniform manner, that is, the distance between any two adjacent winding plates is not equal. For example, the distance between certain two adjacent winding plates is greater than the distance between any other two adjacent winding plates. At this time, each tapping is led out from between the two winding plates, so that the tooth height of the comb teeth in the middle of the winding plate does not need to be set larger, and a setting position for each tapping can also be left.

[0046] In other embodiments, the winding plate can also be a ring-shaped disc member arranged in the circumferential direction of the high-voltage winding. The several winding plates are arranged at intervals in the axial direction of the high-voltage winding, and the wire is wound in the groove formed by the two adjacent winding plates.

[0047] In the present embodiment, the winding plate 1311 is made of glass fiber impregnated epoxy resin. After the glass fiber cloth is impregnated with epoxy resin and stacked to a certain thickness, it is molded and cured to form a rectangular glass steel plate member. The winding groove 1312 is formed on the glass steel plate member, which can be milled to form the winding groove 1312, thereby forming the winding plate 1311. When winding the wire, the winding plate 1311 can be fixedly connected to the outer circumferential surface of the winding tool by an adhesive, which is the most economical in material and can save costs. The adhesive is a two-component high-temperature-resistant epoxy adhesive. Of course, it can also be other adhesive, but it needs to ensure that the adhesive can firmly bond the winding tool and the winding plate 1311, and is resistant to high temperature to adapt to the high-temperature injection of the high-voltage insulating layer 1330 outside the winding body 1310.

[0048] In the present embodiment, the winding plate 1311 is molded and cured to form. In other embodiments, the comb-shaped winding plate can also be directly formed by integral casting and curing, which simplifies the process, and the material of the winding plate is consistent with the foregoing, which will not be repeated here.

[0049] The winding body 1310 is made of the above-mentioned fiber-reinforced composite material, which has the characteristics of light weight and high strength, so that the winding body 1310 has good mechanical strength and can effectively support the winding of the wire, which is not easy to be damaged and avoids the injection impact force generated when the high-temperature vulcanized silicone rubber is injected outside the winding body 1310 from displacing the wire. The fiber-reinforced composite material has good heat resistance, which avoids deformation of the winding body 1310 due to excessive heat generated by the high-voltage coil 1320 during operation of the dry-type transformer 10.

[0050] Referring to Figure 7 ,Figures 9-11 The fixing ring 1400 is annular, a plurality of fixing rings 1400 are arranged along the axial direction of the high-voltage winding 130 and coaxial with the high-voltage winding 130, and the fixing ring 1400 is clamped and connected with the winding plate 1311. The fixing ring 1400 can keep the stable arrangement of the winding plate 1311, and avoid the dislocation of the winding plate 1311 during the winding process and the high-voltage insulation layer injection process.

[0051] In this embodiment, the plurality of fixing rings 1400 include two first fixing rings 1410, the shape of the first fixing ring 1410 matches the high-voltage winding 130, which can be a circular ring, an elliptical ring, or other rings, and the two first fixing rings 1410 are respectively installed at the two ends of the winding plate 1311. The bottom of the winding groove 1312 at the end of the winding plate 1311 is provided with a first clamping groove 1313 for clamping the first fixing ring 1410, the first clamping groove 1313 is arranged along the side wall of the winding groove 1312 close to the end of the winding plate 1311, so that the first fixing ring 1410 can be arranged close to the side wall of the winding groove 1312 at the end of the winding plate 1311, to ensure the connection strength between the first fixing ring 1410 and the winding plate 1311, for the convenience of description, the space in the winding groove 1312 at the end of the winding plate 1311 for winding the wire except for the first fixing ring 1410 is defined as a second clamping groove 1314, that is, on the same winding plate 1311, from one end to the other end, the first clamping groove 1313, the second clamping groove 1314, a plurality of winding grooves 1312, the second clamping groove 1314, and the first clamping groove 1313 are arranged in sequence and at intervals.

[0052] The two first fixing rings 1410 are provided with a plurality of grooves 1411 on the mutually facing away surfaces, the grooves 1411 are arranged along the radial direction of the first fixing ring 1410 and are uniformly distributed along the circumferential direction of the first fixing ring 1410, and the plurality of grooves 1411 correspond to the plurality of winding plates 1311 one by one. The length of the groove 1411 along the circumferential direction of the first fixing ring 1410 is defined as the width of the groove 1411, and the length of the winding plate 1311 along the circumferential direction of the winding body 1310 is defined as the width of the winding plate 1311, the width of the groove 1411 matches the width of the winding plate 1311; the length of the groove 1411 along the axial direction of the first fixing ring 1410 is defined as the depth of the groove 1411, and the length of the comb tooth on the winding plate 1311 along the axial direction of the winding body 1310 is defined as the width of the comb tooth, the depth of the groove 1411 matches the width of the comb tooth at the end of the winding plate 1311; one end of the winding plate 1311 provided with the comb tooth is defined as the top end of the winding plate 1311, and the other end is defined as the bottom end of the winding plate 1311, the length from the top end of the winding plate 1311 to the bottom end of the winding plate 1311 is defined as the height of the winding plate 1311, the height of the winding plate 1311 matches the ring width of the first fixing ring 1410, so that the comb tooth at the end of the winding plate 1311 can be accommodated in the groove 1411 after the winding plate 1311 and the first fixing ring 1410 are connected.

[0053] The inner periphery of the first fixing ring 1410 is provided with a plurality of third clamping grooves 1412. The plurality of third clamping grooves 1412 are arranged along the radial direction of the first fixing ring 1410 and correspond to the plurality of winding plates 1311 one by one. The plurality of third clamping grooves 1412 correspond to the plurality of recesses 1411 one by one and are in communication. The length of the third clamping groove 1412 along the radial direction of the first fixing ring 1410 is defined as the length of the third clamping groove 1412. The length of the third clamping groove 1412 matches the distance from the bottom wall of the first clamping groove 1313 to the bottom end of the winding plate 1311, so that the first fixing ring 1410 can be clamped on the winding plate 1311 through the cooperation of the third clamping groove 1412 and the first clamping groove 1313. The length of the first clamping groove 1313 along the axial direction of the winding plate 1311 is defined as the slot width of the first clamping groove 1313. The length of the recess 1411 of the first fixing ring 1410 along the axial direction thereof is defined as the thickness of the first fixing ring 1410. The slot width of the first clamping groove 1313 matches the thickness of the first fixing ring 1410. In this way, the first fixing ring 1410 and the first clamping groove 1313 are completely matched in size, so that the first fixing ring 1410 is clamped in the first clamping groove 1313 without the need for an adhesive. The length of the bottom wall of the first clamping groove 1313 from the bottom end of the winding plate 1311 is less than the length of the bottom wall of the second clamping groove 1314 from the bottom end of the winding plate 1311, so that the first clamping groove 1313 and the second clamping groove 1314 form a stepped structure. The stepped structure can stably clamp the first fixing ring 1410 and prevent the first fixing ring 1410 from moving. At least one first mounting hole 1413 is arranged between any two adjacent third clamping grooves 1412 on the first fixing ring 1410 for passing the airway member 240. In this embodiment, two first mounting holes 1413 are arranged between any two adjacent third clamping grooves 1412 on the first fixing ring 1410. One group of adjacent two third clamping grooves 1412 can not be provided with a first mounting hole 1413, which is used as a wire crossing channel or a lead-out tap during wire winding. In other embodiments, the first fixing ring can also be fixed in the first clamping groove by an adhesive, as long as the first fixing ring and the first clamping groove can be fixedly connected, which is not limited herein. One, three or more first mounting holes can be arranged between any two adjacent third clamping grooves on the first fixing ring. The first mounting hole can also be arranged on the first fixing ring as long as the airway member can be stably mounted, which is not limited herein.

[0054] In the embodiment, the plurality of fixing rings 1400 further comprise a second fixing ring 1420, the second fixing ring 1420 has the same shape as the first fixing ring 1410, both of which are circular, elliptical or other ring shape. The width of the fixing ring 1400 along the radial direction of the winding body 1310 is defined as the ring width of the fixing ring 1400, the ring width of the second fixing ring 1420 is smaller than the ring width of the first fixing ring 1410, the inner circumference of the second fixing ring 1420 is larger than the inner circumference of the first fixing ring 1410, the outer circumference of the second fixing ring 1420 is smaller than the outer circumference of the first fixing ring 1410, and the second fixing ring 1420 is arranged at the middle part of the winding plate 1311. The middle part of the winding plate 1311 is provided with a fifth clamping groove 1315, the fifth clamping groove 1315 is located at the top of a comb tooth in the middle of the winding plate 1313, the second fixing ring 1420 is clamped in the fifth clamping groove 1315, which ensures the effective connection between the second fixing ring 1420 and the winding plate 1311. The ring width of the second fixing ring 1420 is smaller than the height of the winding plate 1311, which facilitates the extraction of the tap wire during winding and the flow of silicone rubber during injection of high-voltage insulation layer. A plurality of fourth clamping grooves 1421 are arranged on the inner circumference of the second fixing ring 1420 along the radial direction thereof, the plurality of fourth clamping grooves 1421 are uniformly distributed, and the number of the fourth clamping grooves 1421 is equal to that of the winding plate 1311. The length of the fourth clamping groove 1421 along the circumferential direction of the second fixing ring 1420 is defined as the width of the fourth clamping groove 1421, which matches the width of the winding plate 1311; the distance from one end of the fourth clamping groove 1421 to the other end along the radial direction of the winding body 1310 is defined as the length of the fourth clamping groove 1421, which is equal to or slightly smaller than the length of the fifth clamping groove 1315 from the bottom end of the winding plate 1311; the length of the second fixing ring 1420 along the axial direction thereof is defined as the thickness of the second fixing ring 1420, and the length of the fifth clamping groove 1315 along the axial direction of the winding body 1310 is defined as the height of the fifth clamping groove 1315, which matches the thickness of the second fixing ring 1420. In this way, the second fixing ring 1420 and the fifth clamping groove 1315 are completely matched in size, so that the second fixing ring 1420 is clamped in the fifth clamping groove 1315 through the fourth clamping groove 1421 without the need for an adhesive. Correspondingly, no wire is wound in the fifth clamping groove 1315. In other embodiments, multiple second fixing rings can be arranged and clamped at the upper part of the winding plate, which is not limited here.At least one second mounting hole 1422 is arranged between two adjacent fourth clamping slots 1421 on the second fixing ring 1420, and the second mounting hole 1422 is arranged corresponding to the first mounting hole 1413, that is, the shapes and quantities of the two are the same, and the second mounting hole 1422 is used for cooperating with the air passage piece 240; in the embodiment, two second mounting holes 1422 are arranged between two adjacent fourth clamping slots 1421 on the second fixing ring 1420, and one group of two adjacent fourth clamping slots 1421 can not be provided with a second mounting hole 1422, which is used as a wire crossing channel or a lead-out tap during wire winding. In other embodiments, the second fixing ring and the fifth clamping slot can also be fixed by using an adhesive, as long as the second fixing ring and the fifth clamping slot can be fixedly connected, which is not limited herein; one, three or more second mounting holes can be arranged between two adjacent fourth clamping slots on the second fixing ring, and the second mounting hole can also be arranged on the second fixing ring at will, as long as it can correspond to the first mounting hole to stably support the air passage piece, which is not limited herein.

[0055] The fixing ring 1400 is also made of glass fiber impregnated epoxy resin, and is formed into a ring-shaped glass steel plate piece by impregnating a plurality of layers of glass fiber cloth with epoxy resin, stacking to a certain thickness, and molding and curing. The fixing ring 1400 can also be a glass fiber reinforced polyimide composite plate, which is simple to obtain and convenient to process; the fixing ring 1400 made of fiber reinforced composite material has good mechanical strength, can stably support the winding of the wire, and is not easy to damage, thereby avoiding the generation of a large injection impact force when the high-temperature vulcanized silicone rubber is injected outside the winding body 1310, which will disperse and shift the wire; and the fiber reinforced composite material has good heat resistance, which can avoid deformation of the fixing ring 1400 due to overheating during operation of the dry-type transformer 10. In the embodiment, the fixing ring 1400 is molded and cured to form, and in other embodiments, the auxiliary part can also be integrally cast and cured to directly form, thereby simplifying the process, and the material of the fixing ring is consistent with the foregoing, which will not be described again.

[0056] Referring to Figures 12-13The high-voltage winding 130 further comprises a plurality of support rings 1340, which are annular, axially spaced along the high-voltage winding 130 and coaxial with the high-voltage winding 130, and are clamped inside the coils in the winding slot 1312, one support ring 1340 being clamped in each coil. The length of the winding slot 1312 along the axial direction of the winding body 1310 is defined as the height of the winding slot 1312, the length of the support ring 1340 along the axial direction of the winding body 1310 is defined as the thickness of the support ring 1340, and the length of the coil along the axial direction of the winding body 1310 is defined as the width of the coil. The height of the winding slot 1312, the thickness of the coil, and the thickness of the support ring 1340 are matched so that the support ring 1340 can compress the conductors inside the support ring 1340 and provide effective support to the conductors outside the support ring 1340. The support ring 1340 is provided with a plurality of third mounting holes 1341, which are arranged correspondingly with the first mounting holes 1413 and the second mounting holes 1422, and are used to cooperate with the air passage member 240. The length of the support ring 1340 along the radial direction of the winding body 1310 is defined as the width of the support ring 1340, and the length of the third mounting hole 1341 along the radial direction of the winding body 1310 is defined as the width of the third mounting hole 1341. The width of the support ring 1340 is greater than the width of the third mounting hole 1341, i.e., the width of the support ring 1340 is greater than the width of the air passage member 240, i.e., greater than the width of the air passage finally formed. In this way, the air passage member 240 has a certain gap with the conductors on the inner and outer sides thereof. When the high-temperature vulcanized silicone rubber is injected into the winding body 1310, the high-temperature vulcanized silicone rubber will fill the gap, ensuring that the conductors on the inner and outer sides of the air passage are covered with high-temperature vulcanized silicone rubber, preventing the conductors from being exposed to the air, and being conducive to prolonging the service life of the high-voltage winding 130.

[0057] In an embodiment, referring to Figure 12The support ring 1340 is made of solid insulating material, which can be glass fiber reinforced epoxy resin composite material, glass fiber reinforced polyimide composite material, etc. The support ring 1340 includes a first plate member 1343 and a second plate member 1346, both of which are semi-elliptical ring-shaped plate members. The first plate member 1343 and the second plate member 1346 are butted to form the support ring 1340. The first plate member 1343 and the second plate member 1346 have one end as a bevel, and the first butt joint 1344 formed after butting is a beveled opening. When winding the high-voltage coil 1320, the wire can be wound from the inside of the support ring 1340 to the outside of the support ring 1340, so that the wire can be continuously wound on both sides of the support ring 1340. The other end of the first plate member 1343 and the second plate member 1346 is a flat surface, and the second butt joint 1345 formed after butting is a flat opening. The first butt joint 1343 and the second butt joint 1345 are located on both sides of the support ring 1340. The size of the first plate member 1343 and the second plate member 1346 is matched, and the two semi-annular components 1343 are butted. As shown in FIG. 14B, the inner circumferential length of the first plate member 1343 is greater than the outer circumferential length, and the inner circumferential length of the second plate member 1346 is less than the outer circumferential length, so that the direction of the beveled opening is toward the first plate member 1343. When winding the wire, the wire can be transitioned from the inside of the second plate member 1346 to the outside of the first plate member 1343, so that the wire can be wound from the inside of the support ring 1340 to the outside of the support ring 1340. Figure 12 In other embodiments, the inner circumferential length of the second plate member 1346 is greater than the outer circumferential length, and the inner circumferential length of the first plate member 1343 is less than the outer circumferential length, so that the direction of the beveled opening is toward the second plate member 1346. When winding the wire, the wire can be transitioned from the inside of the first plate member 1343 to the outside of the second plate member 1346, so that the wire can be wound from the inside of the support ring 1340 to the outside of the support ring 1340.

[0058] In another embodiment, referring to Figure 13 The support ring 1340 is integrally formed of elastic insulating material, which can be silicone rubber and other elastic materials. The support ring 1340 has a beveled opening 1342 for winding the wire from the inside of the support ring 1340 to the outside of the support ring 1340 when winding the high-voltage coil 1320, so that the wire can be continuously wound on both sides of the support ring 1340. The support ring 1340 can produce a large deformation along the beveled opening 1342, so that the support ring 1340 can be opened and installed in the winding groove 1312, and the installation and removal are more convenient. The direction of the beveled opening 1342 is the same as the winding direction of the wire, which is described in detail above and will not be repeated here.

[0059] In combinationFigures 12-16 The application also discloses a mold assembly 200 for manufacturing the high-voltage winding 130, i.e. during the forming of the high-voltage winding 130, the winding body 1310 is first installed on the mold assembly 200, and the wire winding is performed on the winding body 1310 to form the high-voltage coil 1320 and install the air passage piece 240, then the winding body 1310 and the high-voltage coil 1320 together with the mold assembly 200 are taken as an injection body, the injection body is placed in a mold of an injection machine, and high-temperature vulcanized silicone rubber is integrally injected on the outer periphery of the injection body by adding a silicone rubber raw material to form a high-voltage insulation layer 1330, and the cake-type high-voltage winding 130 including the air passage can be obtained after the mold assembly 200 is demolded and the air passage piece 240 is pulled out.

[0060] The mold assembly 200 comprises a core mold 210, two core shafts 220, a plurality of fixing plates 230 and a plurality of air passage pieces 240. The core mold 210 is a hollow cylindrical body made of metal steel, the hollow core mold 210 is light in weight and convenient to install, and the material consumption is small and the production cost is low. The outer periphery contour of the core mold 210 matches the inner periphery contour of the fixing ring 1400, i.e. the cross section of the core mold 210 can correspond to a circular shape, an elliptical shape or other shapes, so that the winding body 1310 can be stably sleeved on the outer periphery of the core mold 210. In other embodiments, the core mold can also be a solid cylindrical body, which is high in strength and good in integrity. During the wire winding of the high-voltage coil 1320 and the injection molding process of the high-voltage insulation layer 1330, the winding body 1310 is located on the outer periphery of the core mold 210, and the axial length of the winding body 1310 along the core mold 210 is less than or equal to the axial length of the core mold 210.

[0061] The two core shafts 220 are fixedly connected to the center positions of the two end faces of the core mold 210 along the axial direction of the core mold 210, the core shaft 220 is a rod-shaped structure with a rectangular cross section, and is used for installing the fixing plate 230 and fixing the mold assembly 200 in the mold of the injection machine during the injection molding process of the high-temperature vulcanized silicone rubber. The core shaft 220 and the core mold 210 can be fixed by welding, and the materials of the core shaft 220 and the core mold 210 are the same, i.e. metal steel. In other embodiments, the cross section of the core shaft can also be circular or other shapes, and the core shaft can also be made of other metal materials, as long as the functions of installing the fixing plate and fixing the mold assembly can be realized.

[0062] A plurality of fixed plates 230 are connected to one of the mandrels 220 at intervals, the fixed plates 230 are elliptical plate structures, the shape and size of the fixed plates 230 are the same as the outer peripheral shape of the first fixed ring 1410, the fixed plates 230 are provided with a through hole 231 and a plurality of fourth mounting holes 232, the through hole 231 is arranged at the center position of the fixed plate 230, used for penetrating the mandrel 220, the shape of the through hole 231 corresponds to the mandrel 220, so that the mandrel 220 can be clamped in the through hole 231, preventing the fixed plate 230 from twisting and sliding on the mandrel 220, which affects the air channel quality of the high-voltage winding 130. The number and position of the fourth mounting hole 232 correspond to the first mounting hole 1413, the second mounting hole 1422 and the third mounting hole 1341, and each mounting hole is matched for penetrating the air channel member 240. In this embodiment, the fixed plate 230 is provided with two, compared with only one fixed plate 230, the two fixed plates 230 can better limit the air channel member 240, prevent the air channel member 240 from shaking due to instability, and cannot be penetrated into the first mounting hole 1413, the second mounting hole 1422 and the third mounting hole 1341, resulting in the air channel cannot be formed; and can avoid the air channel member 240 being inclined in each mounting hole, so that the air channel formed in the high-voltage winding 130 is inclined and cannot penetrate the high-voltage insulation layer 1330 along the axial direction of the high-voltage winding 130, and cannot play the purpose of heat dissipation. In other embodiments, the fixed plate can also be provided with one, three or more, as long as it can stably install the air channel member, which is not limited here.

[0063] In an embodiment, the air channel member 240 is a rod structure with a capsule-shaped cross section, the shape and size of the cross section of the air channel member 240 correspond to the shape and size of the first mounting hole 1413, the second mounting hole 1422 and the third mounting hole 1341, that is, the first mounting hole 1413, the second mounting hole 1422 and the third mounting hole 1341 are capsule-shaped, which facilitates the stable installation of the air channel member 240. In another embodiment, the air channel member 240 is a rod structure with a rounded trapezoidal cross section, the shape and size of the cross section of the air channel member 240 correspond to the shape and size of the first mounting hole 1413, the second mounting hole 1422 and the third mounting hole 1341, that is, the first mounting hole 1413, the second mounting hole 1422 and the third mounting hole 1341 are rounded trapezoidal holes at this time, which facilitates the stable installation of the air channel member 240. One end of the air channel member 240 has a taper, that is, the outer diameter size of one end of the air channel member 240 gradually decreases in the axial direction thereof away from the air channel member 240, which facilitates the penetration of the air channel member 240 in each mounting hole.

[0064] In combination with Figure 5 , Figure 6 and Figure 8For example, the A-phase transformer 100, the conductive wire is wound circumferentially on the outer circumferential surface of the winding body 1310 to form the high-voltage coil 1320. Specifically, the conductive wire is wound in the winding groove 1312 of the winding plate 1311, so that the high-voltage coil 1320 is distributed in the axial direction of the high-voltage winding 130, and the conductive wire is connected at the beginning and the end to form two external connections, i.e., the first external connection D and the second external connection X, respectively. The first external connection D is used to connect the cable and other external connections, and the second external connection X is used to connect other external connections, such as in a three-phase transformer, for mutual connection between each phase transformer. In addition, the conductive wire is led out from the middle of the winding body 1310 along the axial direction to form six tapping points, i.e., the tapping point 2, the tapping point 3, the tapping point 4, the tapping point 5, the tapping point 6, and the tapping point 7. The six tapping points form a tapping switch, and for the sake of description, the tapping point 2, the tapping point 4, and the tapping point 6 are defined as a first tapping switch, and the tapping point 3, the tapping point 5, and the tapping point 7 are defined as a second tapping switch. The first tapping switch and the second tapping switch are arranged in parallel, and the six tapping points form a tapping device of the high-voltage coil 1320, which is used to adjust the voltage of the dry-type transformer 10 according to different operating conditions.

[0065] In combination Figure 5 and Figure 6 As shown in FIG. 13, the high-voltage insulation layer 1330 is wrapped around the high-voltage coil 1320 and the winding body 1310 to form the high-voltage winding 130. The high-voltage insulation layer 1330 is high-temperature vulcanized silicone rubber. Compared with the existing room-temperature vulcanization process, the use of high-temperature vulcanized silicone rubber can make the high-voltage insulation layer 1330 more stable, have higher mechanical properties, and have better adhesion to the high-voltage coil 1320 and the winding body 1310, thereby effectively prolonging the service life of the high-voltage insulation layer 1330. In addition, compared with liquid silicone rubber, the silicone rubber filler of the present application is uniformly dispersed and does not cause partial discharge due to filler agglomeration, and has better product performance.

[0066] In combination Figures 6-16 When the high-voltage coil 1320 is wound in a pie winding method, first, the winding body 1310 is assembled. The first fixing ring 1410 and the second fixing ring 1420 are clamped on the winding plate 1311 to form the winding body 1310. Specifically, the third clamping groove 1412 of the two first fixing rings 1410 is clamped in the first clamping groove 1313 at both ends of the winding plate 1311, respectively, and the comb teeth at the end of the winding plate 1311 are accommodated in the groove 1411, so that the two first fixing rings 1410 are clamped and connected with both ends of the winding plate 1311, respectively. The fourth clamping groove 1421 is clamped in the fifth clamping groove 1315, so that the second fixing ring 1420 is clamped and connected with the middle part of the winding plate 1311.

[0067] Next, assemble the mold assembly 200. Place the winding body 1310 onto the mold assembly 200, and fix at least two fixing plates 230 onto the mandrel 220 on one side of the mold assembly 200, that is, fix the fixing plates 230 at intervals through through holes 231 onto the outer periphery of the mandrel 220. Further, before this step, a release agent can be applied to the outer periphery of the mandrel 210 to facilitate demolding after the high-voltage winding 130 is formed.

[0068] Then, the high-voltage coil 1320 is wound. In one application scenario, combined with... Figure 5 , Figure 6 and Figure 8 As shown, the conductor includes a first conductor and a second conductor, both of which are continuous conductors. Both the first and second conductors are covered with an insulating layer, which can be a polyimide film, polyester film, fiberglass film, or other insulating materials such as insulating varnish, or a combination of multiple insulating materials; no limitation is made here. For ease of description, the end of the winding body 1310 closest to the fixing plate 230 is defined as the first end, and the other end of the winding body 1310 is defined as the second end. The first conductor is wound from the first end of the winding body 1310 along the axial direction of the high-voltage winding 130 to the middle of the winding body 1310, and three taps are led out. The inner turn of the first conductor at the first end of the winding body 1310 forms a first external connection D exposed outside the high-voltage insulating layer 1330, that is, the first external connection D is led out from the inner turn of the first coil (i.e., the beginning end of the first conductor).

[0069] The first conductor starts winding the first coil from the first end of the winding body 1310 to the second end of the winding body 1310. The first conductor is wound in the second slot 1314 at the first end of the winding body 1310 according to the first preset number of turns, wherein the first preset number of turns is M.

[0070] Then, the support ring 1340 is installed. In one application scenario, the support ring 1340 made of solid insulating material is installed in the winding body 1310, specifically, the first plate 1343 of the support ring 1340 is placed on the outer layer of the first wire wound for M turns, the first plate 1343 is pressed against the first wire wound for M turns, and one end of the first plate 1343 used for abutting with the second plate 1346 to form the first abutting surface 1344 is placed at the tail end of the first wire, wherein the direction of the abutting surface is the same as the winding direction of the first wire, so that the first wire can cross the support ring 1340 along the abutting surface with a small bending angle, thereby enabling the first wire to be continuously wound on both sides of the support ring 1340; the first wire continues to be wound along the abutting surface of the first plate 1343 and presses the first plate 1343, when the other end of the first plate 1343 used for abutting with the second plate 1346 to form the second abutting surface 1345 is reached, the second plate 1346 is installed, the first plate 1343 and the second plate 1346 abut to form the support ring 1340, and the winding continues outside the second plate 1346 until the second plate 1346 is pressed to complete the layer-by-layer winding, at this time the first wire completely wraps the support ring 1340, and the winding of the first pie-shaped coil is completed. The number of turns of the coil wound outside the support ring 1340 is the second preset number of turns N, and the sum of the first preset number of turns M and the second preset number of turns N is the total number of turns of one pie-shaped coil of the high-voltage coil 1320.

[0071] In another application scenario, the support ring 1340 made of elastic insulating material is installed in the winding body 1310, specifically, the support ring 1340 is opened along the oblique cut opening 1342 and installed on the outer layer of the first wire wound for M turns, the support ring 1340 is pressed against the first wire wound for M turns, and the oblique cut opening 1342 of the support ring 1340 is placed at the tail end of the first wire, wherein the opening direction of the oblique cut opening 1342 is the same as the winding direction of the first wire, so that the first wire can cross the support ring 1340 along the oblique cut opening 1342 with a small bending angle, thereby enabling the first wire to be continuously wound on both sides of the support ring 1340; the first wire continues to be wound according to the second preset number of turns N to the first pie-shaped coil.

[0072] Then, the remaining pie-shaped coils are wound according to the method of winding the second pie-shaped coil, and one support ring 1340 is arranged in each pie-shaped coil, until the first wire is wound to the middle of the winding body 1310, and three taps are respectively led out from the outer turn wire ends of the three pie-shaped coils adjacent to the side of the second fixed ring 1420 facing the first end of the winding body 1310, i.e., the tap 6, the tap 4 and the tap 2 as shown in Figure 5 , to form the first tap switch, and the winding of the first wire is completed.

[0073] Then, the second conductor wire is wound from the middle of the winding body 1310 to the second end of the winding body 1310. Specifically, the second conductor wire starts to be wound in the winding groove 1312 adjacent to the side of the second fixed ring 1420 facing the second end of the winding body 1310, and three taps, i.e., tap 3, tap 5 and tap 7 as shown, are led out from the outer turn wire ends of the three-pie winding adjacent to the side of the second fixed ring 1420 facing the second end of the winding body 1310, respectively, to form the second tap switch; then the winding continues until the second conductor wire is wound to the second clamping groove 1314 of the last winding groove 1412 at the second end of the winding body 1310 and forms the final pie winding, and the winding method is the same as that of the first conductor wire. The outer turn wire end of the second conductor wire at the second end of the winding body 1310 forms the second external X exposed outside the high-voltage insulation layer 1330, that is, the second external X is led out from the outer turn wire end of the final pie winding (i.e., the end of the second conductor wire). In other embodiments, the taps can be distributed at other positions in the middle of the high-voltage winding on the winding body according to actual winding structure design requirements, which is not limited herein. Figure 5

[0074] When the conductor wire is wound, it is wound in a corresponding circle of winding grooves 1312 on all winding plates 1311, so that each pie winding formed by the winding of the conductor wire is perpendicular to the axial direction of the high-voltage winding 130, the winding is convenient, the conductor wire is arranged neatly, the winding plates 1311 are uniformly stressed, and the mechanical strength is good.

[0075] In this way, the pie-type high-voltage winding 1320 is formed, and the high-voltage winding structure has good mechanical strength and strong resistance to the electric power generated by the short-circuit current. Compared with the layer-type high-voltage winding, the pie-type high-voltage winding has more pies.

[0076] The conductor wire is wound on the winding body 1310 to form the high-voltage winding 1320, and the high-voltage winding 1320 is annular. The width of the high-voltage winding 1320 is defined as the width of the high-voltage winding 1320, and the width of the high-voltage winding 1320 in each radial cross section is uniform, i.e., the outer side surface of the high-voltage winding 1320 is equidistant from the outer circumferential surface of the high-voltage winding 130, so that the overall stress of the high-voltage winding 1320 is balanced. Of course, considering the actual operation, the width of the high-voltage winding in its radial cross section can also not be completely the same, as long as it is approximately the same.

[0077] In this embodiment, the second conductor wire is wound from the middle of the winding body 1310 to the second end thereof, and in other embodiments, the second conductor wire can also be wound from the second end of the winding body to the middle of the winding body 1310, but the second external X is formed first, and then tap 7, tap 5 and tap 3 are formed in sequence. Of course, the winding method of the high-voltage winding 1320 is not limited to the above method, and other methods can also be used to form the pie-type high-voltage winding, as long as the high-voltage winding 130 can be finally formed.​

[0078] In this embodiment, six taps are included, and the dry-type transformer 10 has five voltage adjustment levels. In other embodiments, four taps can be included, i.e., the first and second taps each include two taps, and the dry-type transformer includes three voltage adjustment levels. The high-voltage coil is thus wound.

[0079] Subsequently, the air passage member 240 is installed. Specifically, a lubricating layer is formed on the air passage member 240 by applying a lubricating material, the lubricating layer is made of a release agent, and the air passage member 240 is wrapped with flexible insulation material, such as silicone cloth or electrical composite material, around the outer periphery of the lubricating layer. The air passage member 240 with the tapered end is sequentially inserted into the first mounting hole 1413, the third mounting holes 1341, the second mounting hole 1422, the third mounting holes 1341, and the first mounting hole 1413 of the other end of the winding body 1310, so that the air passage member 240 penetrates from one side of the winding body 1310 to the other side of the winding body 1310. After all the air passage members 240 are inserted, the winding body 1310 with the high-voltage coil 1320 is placed into an injection machine as a to-be-injected body together with the mold assembly 200. High-temperature vulcanized silicone rubber is injected around the to-be-injected body to form a high-voltage insulation layer, and a preform is obtained. Since the width of the support ring 1340 is greater than the width of the air passage member 240, there is a gap between the inner and outer sides of the air passage member 240. During the injection of high-temperature vulcanized silicone rubber, the high-temperature vulcanized silicone rubber fills the gap and fuses with the flexible insulation material wrapped around the air passage member 240.

[0080] The high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the winding body 1310 and wraps the two ends of the winding body 1310 after covering the high-voltage coil 1320 and the winding body 1310 by integral vacuum injection, so that the high-voltage winding 130 has a hollow columnar shape, which can be a hollow cylinder, a hollow long cylinder, or other hollow columnar bodies. The high-voltage insulation layer 1330 is made of high-temperature vulcanized silicone rubber, which improves the insulation performance and mechanical properties of the high-voltage winding 130.

[0081] Finally, the preform is separated from the mold assembly 200, and the air passage piece 240 is pulled out, to obtain the high-voltage winding 130 provided with axial air passages. Since the air passage piece 240 is provided with a lubricating layer, the pulling out of the air passage piece 240 is facilitated, and after the air passage piece 240 is pulled out, the flexible insulation material integrated with the high-temperature vulcanized silicone rubber remains on the inner surface of the air passage, so that the air passage is covered with the high-temperature vulcanized silicone rubber and the flexible insulation material on the inner and outer sides of the conductors along the radial direction of the high-voltage winding 130, further preventing the conductors from being exposed to the air, which is conducive to prolonging the service life of the high-voltage winding. After the air passage piece 240 is pulled out, the high-voltage winding 130 forms a plurality of air passages, which are arranged in the axial direction of the high-voltage winding 130 and penetrate the high-voltage insulation layer 1330. The formation of the axial air passages enables the high-voltage winding 130 to dissipate heat through the inner surface, the outer surface and the internal axial air passages, which is conducive to improving the heat dissipation efficiency of the high-voltage winding 130, so that the high-voltage winding can be applied to large-capacity dry-type transformers 10 with higher heat dissipation requirements, and the application range is wider; without increasing the volume of the high-voltage winding 130, the heat dissipation area can be increased, the conductor consumption is reduced, and the product cost is controlled.

[0082] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A high voltage winding, characterized by The high-voltage winding comprises a winding body, a high-voltage coil and a high-voltage insulation layer, the winding body comprises a plurality of winding plates and a plurality of fixing rings, the winding plates are connected with the fixing rings through clamping, and a plurality of first mounting holes and a plurality of second mounting holes are arranged on the fixing rings; the high-voltage coil is formed by winding wires on the winding body, the high-voltage coil comprises a plurality of pie-shaped coils, and the high-voltage insulation layer wraps the high-voltage coil and the winding body. The high-voltage winding further comprises a plurality of support rings, the plurality of support rings are clamped inside the high-voltage coil, a plurality of third mounting holes are arranged on the support rings, and the first mounting holes, the second mounting holes and the third mounting holes are used for cooperating with air passage members; the high-voltage winding further comprises a plurality of air passages, and the air passages are arranged along the axial direction of the high-voltage winding and penetrate the high-voltage insulation layer.

2. The high voltage winding of claim 1, wherein, A plurality of comb teeth are arranged on the winding plate, and a plurality of winding plates are uniformly distributed along the circumferential direction of the high-voltage winding, and at least one pie-shaped coil is arranged between adjacent two comb teeth on the winding plate.

3. The high voltage winding of claim 1, wherein, The plurality of fixing rings comprise two first fixing rings, and two first clamping grooves are arranged on the plurality of winding plates correspondingly, and the two first fixing rings are clamped at two ends of the winding plate through the first clamping grooves.

4. The high voltage winding of claim 1, wherein, The plurality of fixing rings comprise at least one second fixing ring, and at least one fifth clamping groove is arranged on the plurality of winding plates correspondingly, and the second fixing ring is clamped at the middle part of the winding plate through the fifth clamping groove.

5. The high voltage winding of claim 1, wherein, The support ring is a ring structure with a bevel opening, and the support ring is made of elastic insulation material.

6. The high voltage winding of claim 1, wherein, The support ring comprises two half-ring assemblies, the two half-ring assemblies are butt-jointed to form the support ring, one end of the two half-ring assemblies is a bevel butt joint to form a bevel opening, and the other end is a flat butt joint to form a flat opening, and the support ring is made of solid insulation material.

7. The high voltage winding of claim 6, wherein, The direction of the bevel opening is the same as the winding direction of the wires of the high-voltage coil.

8. The high voltage winding of claim 1, wherein, The cross section of the air passage member is in the shape of a capsule or a circular-angled trapezoid, the shape and size of the first mounting hole, the second mounting hole and the third mounting hole correspond to and match the cross section of the air passage member; one end of the air passage member gradually decreases in outer diameter size in the axial direction of the air passage member away from the air passage member.

9. The high voltage winding of claim 1, wherein, A lubricating layer is arranged on the outer periphery of the air passage member, and the lubricating layer is made of a release agent.

10. The high voltage winding of claim 9, wherein, The outer periphery of the lubricating layer of the air passage member is wrapped with flexible insulation material, and the flexible insulation material is silica gel cloth or electrical composite material.

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