Winding body of high-voltage winding

Abstract

The winding body comprises a plurality of winding plates and a plurality of fixing rings, the winding plates are evenly distributed in the circumferential direction of the high-voltage winding, the winding plates are connected with the fixing rings in a clamped mode, and the fixing rings are provided with a plurality of first mounting holes and a plurality of second mounting holes. And the first mounting hole and the second mounting hole are used for cooperatively penetrating an air channel piece. The winding body of the high-voltage winding is used for preparing the high-voltage winding internally provided with the axial air channels, so that the high-voltage winding can dissipate heat through the axial air channels on the inner surface, the outer surface and the interior of the high-voltage winding, the heat dissipation efficiency is higher, the high-voltage winding can be applied to a large-capacity dry-type transformer with the higher heat dissipation requirement, the application range is wider, and the practicability is higher. And the cost is lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transformers, in particular to a winding body of 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 is relatively mature, that is, the conductors are 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 conductors of each coil segment are wound to the full number of turns according to the above method, and the conductors 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 conductors are not cut off and are continuously wound to the next pie coil, and the winding is completed until all the coils are wound. Since the number of coil 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 conductors on the inner and outer sides of each pie coil need to be welded, and the welding reliability is greatly reduced; and the gap between adjacent two pie coils is small, and the welding difficulty of the conductors is high. Therefore, the pie-type winding is difficult to dissipate heat by setting an air channel. At present, the existing pie-type winding generally adopts the method of increasing the cross-sectional area of the high-voltage coil conductors to reduce the current density of the conductors, so as to reduce the resistance loss and heat generation, but this method requires more conductors, 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 winding body of a high-voltage winding, which is used to prepare a high-voltage winding with an axial air channel inside, can improve the heat dissipation efficiency, and ensure the safety and reliability of the operation of the high-voltage winding.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is: a winding body of a high-voltage winding, the winding body comprising a plurality of winding plates and a plurality of fixing rings, the plurality of winding plates being uniformly distributed along the circumference of the high-voltage winding, the winding plates being connected with the fixing rings by clamping, the fixing rings being provided with a plurality of first mounting holes and a plurality of second mounting holes, the first mounting holes and the second mounting holes being used for cooperating with the air passage members.

[0007] Among them, the plurality of fixing rings comprises two first fixing rings, and the plurality of winding plates are correspondingly provided with two first clamping grooves, the two first fixing rings being clamped at both ends of the winding plate through the first clamping grooves.

[0008] Among them, the plate surfaces of the two first fixing rings facing away from each other are both provided with a plurality of grooves, the grooves being arranged along the radial direction of the first fixing ring and the plurality of grooves being uniformly distributed along the circumferential direction of the first fixing ring, the plurality of grooves corresponding one-to-one to the plurality of winding plates.

[0009] Among them, the inner circumferences of the first fixing rings are provided with a plurality of third clamping grooves, the plurality of third clamping grooves being arranged along the radial direction of the first fixing ring and corresponding one-to-one to the plurality of winding plates, and the plurality of third clamping grooves being communicated one-to-one with the plurality of grooves, the first fixing rings being clamped on the winding plates by cooperating with the third clamping grooves and the first clamping grooves.

[0010] Among them, the plurality of fixing rings comprises at least one second fixing ring, and the plurality of winding plates are correspondingly provided with at least one fifth clamping groove, the second fixing ring being clamped at the middle part of the winding plate through the fifth clamping groove.

[0011] Among them, the inner circumferences of the second fixing rings are provided with a plurality of fourth clamping grooves along the radial direction of the second fixing rings, the number of the fourth clamping grooves being equal to that of the winding plates, and the second fixing rings being clamped in the fifth clamping grooves through the fourth clamping grooves.

[0012] Among them, the ring width of the second fixing ring is smaller than the ring width of the first fixing ring.

[0013] Among them, at least one first mounting hole is arranged between the adjacent two third clamping grooves on the first fixing ring, and is used for penetrating the air passage member.

[0014] Among them, at least one second mounting hole is arranged between the adjacent two fourth clamping grooves on the second fixing ring.

[0015] Among them, the first mounting hole and the second mounting hole are the same in shape and number, and the first mounting hole and the second mounting hole are correspondingly arranged.

[0016] The application has the beneficial effects that, compared with the prior art, the winding body of the high-voltage winding is used to prepare the high-voltage winding with the axial air duct inside, so that the high-voltage winding can dissipate heat through the inner surface, the outer surface and the axial air duct inside, and the heat dissipation efficiency is higher, so that the structure can be applied to the large-capacity dry-type transformer with higher heat dissipation requirement, and the application range is wider; and compared with the heat dissipation mode of increasing the cross-sectional area of the high-voltage coil conductor, reducing the resistance loss and increasing the surface area, the wire consumption is reduced, and the product cost is reduced.

[0017] Meanwhile, the winding body of the high-voltage winding of the application adopts the fixed ring to clamp the winding plate and install the air duct piece, which has a simple and stable structure, can avoid the movement and misplacement of the winding plate and the air duct piece during the winding process and the high-voltage insulation layer injection process, and affects the quality of the high-voltage winding. BRIEF DESCRIPTION OF DRAWINGS

[0018] 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 labor. Among them:

[0019] Figure 1 is the front view of the dry-type transformer 10 of an embodiment of the application;

[0020] Figure 2 is the top view of the dry-type transformer 10 of an embodiment of the application;

[0021] Figure 3 is the front view of the assembled iron core 110 of an embodiment of the application;

[0022] Figure 4 is Figure 2 is an enlarged view of G in FIG. 10;

[0023] Figure 5 is the perspective schematic view of the high-voltage winding 130 of an embodiment of the application;

[0024] Figure 6 is the perspective schematic view of the high-voltage coil 1320 wound on the winding body 1310 of an embodiment of the application;

[0025] Figure 7 is the perspective schematic view of the winding plate 1311 of an embodiment of the application;

[0026] Figure 8 is the circuit diagram of the high-voltage coil 1320 of an embodiment of the application;

[0027] Figure 9is a perspective view of a winding body 1310 according to an embodiment of the present application;

[0028] Figure 10 is a perspective view of a first fixing ring 1410 according to an embodiment of the present application;

[0029] Figure 11 is a perspective view of a second fixing ring 1420 according to an embodiment of the present application;

[0030] Figure 12 is a perspective view of a winding body 1310 according to an embodiment of the present application, which is set on a mold assembly 200;

[0031] Figure 13 is a perspective view of a fixing plate 230 according to an embodiment of the present application;

[0032] Figure 14 is a schematic view of winding a first pie-shaped coil according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] 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 part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] As shown in Figures 1-3 The dry-type transformer 10 is a three-phase transformer, and is respectively an A-phase, a B-phase and a C-phase, i.e. the dry-type transformer 10 comprises three single-phase transformers 100. According to different structures of the iron 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.

[0035] 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.

[0036] 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.

[0037] In combination with Figure 2 and Figure 4As shown, the low-voltage winding 120 includes copper foils 121 and low-voltage insulating layers 122, which are arranged alternately. 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 alternate arrangement of the copper foils 121 and the low-voltage insulating layers 122. The low-voltage winding 120 is provided with at least one heat dissipation air channel, which 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 low-voltage insulating layers 122 and the copper foils 121 are continued to be 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, which simultaneously play a role in 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 continued to be 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, so as to 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 herein.

[0038] Referring to Figures 5-7 , Figure 9 , the high-voltage winding 130 includes 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 includes a plurality of coil segments, which 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, so that the structure of the rigid insulating inner liner is omitted, 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, so that there is no surface discharge of the rigid insulating inner liner, and the material is saved and the cost is reduced.

[0039] 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.

[0040] 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. The plurality of winding grooves 1312 are arranged in the radial direction of the high-voltage winding 130 and are 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 at 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. Increasing the tooth height at both ends of the winding plate 1311 can enhance the impact resistance. The middle of the winding plate 1311 needs to lead out the joint of the tap wire. Increasing the tooth height at the middle of the winding plate 1311 can increase the distance between the corresponding adjacent two winding grooves 1312, so as to leave 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 glue, but it can also be other adhesive glue, but it needs to ensure that the adhesive can firmly bond the winding tool and the winding plate 1311, and it is resistant to high temperature to adapt to the high-temperature injection of the high-voltage insulating layer 1330 outside the winding body 1310.

[0045] In the present embodiment, the winding plate 1311 is molded and cured to form a comb-shaped winding plate. In other embodiments, the winding plate can also be integrally cast and cured to directly form a comb-shaped winding plate, which simplifies the process and has the same material as the foregoing, which will not be described again.

[0046] 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.

[0047] 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 displacement of the winding plate 1311 during the winding process and the high-voltage insulation layer injection process.

[0048] In the 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 arranged 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 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.

[0049] 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.

[0050] 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.

[0051] 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 of the winding plate 1311. The middle 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 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 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 on the winding plate at intervals, which is not limited herein.At least one second mounting hole 1422 is arranged between two adjacent fourth clamping grooves 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 numbers 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 grooves 1421 on the second fixing ring 1420, and one group of two adjacent fourth clamping grooves 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 groove can also be fixed by using an adhesive, as long as the second fixing ring and the fifth clamping groove can be fixedly connected, which is not limited herein; one, three or more second mounting holes can be arranged between two adjacent fourth clamping grooves 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.

[0052] 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 and can stably support the winding of the wire, and is not easy to be damaged, thereby avoiding the wire from being scattered and displaced by a large injection impact force generated when the high-temperature vulcanized silicone rubber is injected outside the wire winding body 1310; and the fiber reinforced composite material has good heat resistance, which can avoid deformation of the fixing ring 1400 caused by overheating during operation of the dry-type transformer 10. In the embodiment, the fixing ring 1400 is molded and cured to be formed, and in other embodiments, the auxiliary part can also be directly formed by integral casting and curing to simplify the process, and the material of the fixing ring is consistent with the foregoing, which will not be described herein.

[0053] Referring to Figures 12-14 The application also discloses a mold assembly 200 for manufacturing the high-voltage winding 130, that is, during the molding process of the high-voltage winding 130, the wire winding body 1310 needs to be first installed on the mold assembly 200, and the wire winding is performed on the wire winding body 1310 to form the high-voltage coil 1320 and install the air passage piece 240, then the wire 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, high-temperature vulcanized silicone rubber is injected on the outer periphery of the injection body as a whole by adding silicone rubber raw materials to form a high-voltage insulation layer 1330, and the air passage piece 240 is pulled out after demolding to obtain a pie-type high-voltage winding 130 including an air passage.

[0054] The mold assembly 200 comprises a core mold 210, two core shafts 220, several fixing plates 230 and several air passage pieces 240. The core mold 210 is a hollow cylindrical body made of metal steel, and the hollow core mold 210 is light in weight, easy to install, and low in material consumption and production cost. The outer peripheral contour of the core mold 210 matches the inner peripheral contour of the fixing ring 1400, that is, 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 winding of the high-voltage coil 1320 and injection molding of the high-voltage insulation layer 1330, the winding body 1310 is located on the outer peripheral surface of the core mold 210, and the axial length of the winding body 1310 is less than or equal to the axial length of the core mold 210.

[0055] The two core shafts 220 are fixedly connected to the center positions of the two end surfaces of the core mold 210 along the axial direction of the core mold 210, and the core shaft 220 is a rod-shaped structure with a rectangular cross section, which is used to install the fixing plate 230 and fix 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, both of which are 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 it can realize the functions of installing the fixing plate and fixing the mold assembly.

[0056] 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 of the fixed plates 230 is the same as and equal in size to 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 third mounting holes 232, the through hole 231 is arranged at the center position of the fixed plate 230 and is used to pass through the mandrel 220, the shape of the through hole 231 corresponds to and matches the mandrel 220, so that the mandrel 220 can be passed through and clamped in the through hole 231, preventing the fixed plate 230 from twisting and sliding on the mandrel 220, which causes the air passage piece 240 to be unable to be stably installed, affecting the air passage quality of the high-voltage winding 130. The number and position of the third mounting hole 232 correspond to the first mounting hole 1413 and the second mounting hole 1422, and each mounting hole is used to pass through the air passage piece 240. In this embodiment, the fixed plate 230 is provided as two, compared with only one fixed plate 230, the two fixed plates 230 can better limit the air passage piece 240, prevent the air passage piece 240 from shaking due to instability, and cannot be passed into the second mounting hole 1422, causing the air passage to be unable to be formed; and can avoid the air passage piece 240 being inclined and passing through each mounting hole, so that the air passage 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 as one, three or more, as long as it can stably install the air passage piece, which is not limited here.

[0057] In an embodiment, the air passage piece 240 is a rod-shaped structure with a capsule-shaped cross section, the shape and size of the cross section of the air passage piece 240 correspond to and match the shape and size of the first mounting hole 1413, the second mounting hole 1422 and the third mounting hole 232, that is, the first mounting hole 1413, the second mounting hole 1422 and the third mounting hole 232 are capsule-shaped, facilitating stable installation of the air passage piece 240. In another embodiment, the air passage piece 240 is a rod-shaped structure with a rounded trapezoidal cross section, the shape of the cross section of the air passage piece 240 corresponds to and matches the shape of the second mounting hole 1422 and the third mounting hole 232, that is, the first mounting hole 1413, the second mounting hole 1422 and the third mounting hole 232 are rounded trapezoidal holes at this time, facilitating stable installation of the air passage piece 240. One end of the air passage piece 240 has a taper, that is, the outer diameter size of one end of the air passage piece 240 gradually decreases in the axial direction thereof away from the air passage piece 240, facilitating the passage of the air passage piece 240 in each mounting hole.

[0058] In combination 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 to the first external connection D and the second external connection X at the end after winding, 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, it is used 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 of the winding body 1310, and six tapping points are formed, which are tapping point 2, tapping point 3, tapping point 4, tapping point 5, tapping point 6 and tapping point 7. The six tapping points form a tapping switch, for the convenience of description, the tapping point 2, the tapping point 4 and the tapping point 6 are defined as the first tapping switch, and the tapping point 3, the tapping point 5 and the tapping point 7 are defined as the 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.

[0059] 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, the mechanical properties are higher, and the adhesion performance with the high-voltage coil 1320 and the winding body 1310 is better, which can effectively prolong 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 local discharge is not caused by filler agglomeration, and the product performance is better.

[0060] In combination Figures 6-14 When the high-voltage coil 1320 is wound by the pie winding method, first, the winding body 1310 is assembled. The first fixed ring 1410 and the second fixed 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 fixed 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 fixed 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 fixed ring 1420 is clamped and connected with the middle part of the winding plate 1311.

[0061] Secondly, the mold assembly 200 is assembled. The winding body 1310 is sleeved on the mold assembly 200, and at least two fixing plates 230 are fixed on the shaft 220 on one side of the mold assembly 200, that is, each fixing plate 230 is fixed on the outer periphery of the shaft 220 through the through hole 231. Further, before this step, a release agent can be coated on the outer periphery of the core mold 210 to facilitate demolding after the high-voltage winding 130 is formed.

[0062] Then, the high-voltage coil 1320 is wound. During the winding of each coil, when the wire is wound to a first preset number of turns, the air passage piece 240 is inserted into a preset position along the axial direction of the winding body 1310, and then the wire is wound to a second preset number of turns.

[0063] In an application scenario, as shown in Figure 5 , Figure 6 and Figure 8 , the wire includes a first wire and a second wire, both of which are continuous wires, and both the first wire and the second wire are coated with an insulating layer, which can be a polyimide film, a polyester film, a glass fiber film, or other insulating materials such as insulating paint, or a combination of multiple insulating materials, which is not limited here. For convenience of description, the end of the winding body 1310 close 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 wire is wound from the first end of the winding body 1310 to the middle of the winding body 1310 along the axial direction of the high-voltage winding 130, and three taps are led out. The inner turn wire end of the first wire at the first end of the winding body 1310 forms a first external D exposed to the outside of the high-voltage insulating layer 1330, that is, the first external D is led out at the inner turn wire end of the first coil (i.e., the first end of the first wire).

[0064] Specifically, the first wire is wound to form a first pie-shaped coil from the first end of the winding body 1310 to the second end of the winding body 1310, and the first wire is wound in the second clamping groove 1314 of the first winding groove 1412 at the first end of the winding body 1310 according to a first preset number of turns, where the first preset number of turns is M; after the winding is completed, a layer of insulating support material is wrapped outside the first pie-shaped coil with M turns, and the insulating support material is glass fiber mesh, electrical composite material or silica gel cloth; the air passage piece 240 is inserted into the first winding body 1310 from the first end of the winding body 1310 to the first preset position in the winding body 1310, that is, the tapered end of the air passage piece 240 is sequentially inserted into the third mounting hole 232, the first mounting hole 1413 on the first fixed ring 1410 close to the fixed plate 230, and moved along the outer periphery of the first pie-shaped coil with M turns towards the second end of the winding body 1310 until the air passage piece 240 reaches the first preset position and stops moving, where the first preset position is the second comb tooth at the first end of the winding body 1310, so as to avoid the air passage piece 240 extending into the second winding groove 1312 at the first end of the winding body 1310 and affecting the winding of the second pie-shaped coil; after all the air passage pieces 240 are inserted into the first preset position, a layer of insulating support material is wrapped outside all the air passage pieces 240, where the insulating support material does not wrap the tail end of the first wire to avoid affecting the continuous winding of the first wire; then the first wire is wound according to a second preset number of turns N on the outer periphery of the layer of insulating support material to complete the winding of the first pie-shaped coil, where the sum of the second preset number of turns N and the first preset number of turns M is the designed total number of turns of one pie-shaped coil of the high-voltage coil 1320. Further, before the air passage piece 240 is installed, a lubricating layer can be formed by applying a lubricating material to the outer periphery of the air passage piece 240, and the lubricating layer is made of a release agent to facilitate the smooth pulling out of the air passage piece 240 after the high-voltage insulating layer 1330 is formed. In the embodiment, the insulating support material is provided in two layers for clamping the air passage piece 240, and in other embodiments, it can be provided in three layers, four layers or more layers.

[0065] Then, the first wire continues to wind the second cake coil at the second end of the winding body 1310, that is, the outer turn wire end of the first cake coil extends to the corresponding second winding groove 1312 on all winding plates 1311 to wind according to the first preset number of turns M; after winding, a layer of insulating support material is wrapped on the outer layer of the second cake coil with M turns; the air channel piece 240 is inserted into the second preset position in the winding body 1310 along the axial direction of the winding body 1310 until the air channel piece 240 reaches the second preset position and stops moving, wherein the second preset position is the third comb tooth at the first end of the winding body 1310, so as to avoid the air channel piece 240 extending into the third winding groove 1312 at the first end of the winding body 1310 and affecting the winding of the third cake coil; after all the air channel pieces 240 are inserted into the second preset position, a layer of insulating support material is wrapped on the outer periphery of all the air channel pieces 240; then, the first wire is wound to the second cake coil according to the second preset number of turns N on the outer periphery of the layer of insulating support material.

[0066] Then, according to the method of winding the second cake coil, the remaining cake coils are wound in turn until the first wire is wound to the middle of the winding body 1310 and three taps are drawn from the outer turn wire end of the three cake coils adjacent to the side of the second fixed ring 1420 facing the first end of the winding body 1310, that is, the tap 6, the tap 4 and the tap 2 as shown, to form a first tap switch, and the winding of the first wire is completed. Figure 5

[0067] Then, each air channel piece 240 is inserted into the second mounting hole 1422 until the end of the air channel piece 240 is flush with the plate surface of the second fixed ring 1420 facing the second end of the winding body 1310 and stops moving, and the second wire is wound from the middle of the winding body 1310 to the second end of the winding body 1310. Specifically, the second wire starts to wind 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 are drawn from the outer turn wire end of the three cake coils adjacent to the side of the second fixed ring 1420 facing the second end of the winding body 1310, that is, the tap 6, the tap 4 and the tap 2 as shown. Figure 5 ​The tap 3, the tap 5 and the tap 7 shown form a second tapping switch; then continue to wind until the second 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 a final cake coil, and the specific winding method and the mounting method of the air passage piece 240 are the same as those of the first wire. The second wire at the outer turn wire end of the second end of the winding body 1310 forms a second external X exposed to the outside of the high-voltage insulation layer 1330, that is, the second external X is led out at the outer turn wire end of the final cake coil (that is, the end of the second wire), at this time the air passage piece 240 passes through the first mounting hole 1413 on the first fixing ring 1410 at the second end of the winding body 1310, and the second wire is wound. In other embodiments, the taps can be distributed at other positions in the middle of the high-voltage coil on the winding body according to actual coil structure design needs, which is not limited here.

[0068] When winding the wire, winding is performed in a corresponding circle of winding grooves 1312 on all winding plates 1311, so that each cake coil formed by winding the wire is perpendicular to the axial direction of the high-voltage winding 130, winding is convenient, the wire is arranged neatly, the winding plate 1311 is uniformly stressed, and the mechanical strength is good.

[0069] In this way, a cake type high-voltage coil 1320 is formed, and the high-voltage coil structure has good mechanical strength and strong resistance to the electric power generated by the short-circuit current. Compared with a layer type high-voltage coil, the cake number is larger.

[0070] The wire is wound on the winding body 1310 to form a high-voltage coil 1320, and the high-voltage coil 1320 is annular. The width of the high-voltage coil 1320 is defined as the width of the high-voltage coil 1320, and the width of the high-voltage coil 1320 in each radial cross section is uniform, that is, the outer side surface of the high-voltage coil 1320 is equidistant from the outer circumferential surface of the high-voltage winding 130, so that the high-voltage coil 1320 is balanced in overall stress. Of course, considering the actual operation, the width of the high-voltage coil in the radial cross section can also not be completely the same, as long as it is approximately the same.

[0071] In this embodiment, the second wire is wound from the middle of the winding body 1310 to the second end thereof, and in other embodiments, the second wire can also be wound from the second end of the winding body to the middle of the winding body 1310. Only the second external X is formed first, and then the tap 7, the tap 5 and the tap 3 are formed in sequence. Of course, the winding method of the high-voltage coil 1320 is not limited to the above method, and other methods can also be used to form a cake type high-voltage coil, as long as a high-voltage winding 130 can be finally formed.

[0072] In this embodiment, the tap switch includes six taps, and the dry-type transformer 10 has five positions to adjust the voltage. In other embodiments, the tap switch can include four taps, that is, the first tap switch and the second tap switch each include two taps, and the dry-type transformer includes three positions to adjust the voltage, as long as the actual use requirements of the dry-type transformer are met, and the dry-type transformer is not limited herein. Thus, the high-voltage coil is wound.

[0073] Then, the winding body 1310 wound with the high-voltage coil 1320 is placed into a mold of an injection machine as a to-be-injected body together with the mold assembly 200, and a raw material of silicone rubber is added to inject high-temperature vulcanized silicone rubber around the to-be-injected body to form a high-voltage insulation layer, so as to obtain a preform.

[0074] After the high-temperature vulcanized silicone rubber is injected to cover the high-voltage coil 1320 and the winding body 1310, 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, 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 performance of the high-voltage winding 130.

[0075] Finally, the preform is separated from the mold assembly 200, and the air passage piece 240 is pulled out, so as to obtain a high-voltage winding 130 provided with an axial air passage, specifically, a high-voltage encapsulated pie-type winding. The axial air passage is arranged along the axial direction of the high-voltage winding 130 and penetrates the high-voltage insulation layer 1330, so that the high-voltage winding 130 can dissipate heat through the inner surface, the outer surface, and the axial air passage inside, and has higher heat dissipation efficiency. Therefore, the high-voltage winding 130 can be applied to a large-capacity dry-type transformer 10 with higher heat dissipation requirements, and has a wider application range. Compared with the traditional heat dissipation method of reducing the resistance loss by increasing the cross-sectional area of the high-voltage coil wire, the amount of wire is reduced, and the product cost is reduced. Since the air passage piece 240 is in contact with the two sides of the high-voltage coil 130, and the two sides are covered with insulating support materials, when the air passage piece 240 is pulled out to form an air passage, the wire in the air passage is not exposed to the air, which is beneficial to prolong the service life of the high-voltage winding 130.

[0076] The above description 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 conversion 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 winding body of a high voltage winding, characterized in that The winding body comprises a plurality of winding plates and a plurality of fixing rings, the plurality of winding plates are uniformly distributed along the circumference of the high-voltage winding, the winding plates are connected with the fixing rings through clamping, the fixing rings are provided with a plurality of first mounting holes and a plurality of second mounting holes, and the first mounting holes and the second mounting holes are used for cooperating with the air passage member.

2. The winding body of a high voltage winding as claimed in claim 1, characterized in that 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.

3. The winding body of a high voltage winding as claimed in claim 2, characterized in that The mutually facing away surfaces of the two first fixing rings are provided with a plurality of grooves, the grooves are arranged along the radial direction of the first fixing ring and are uniformly distributed along the circumferential direction of the first fixing ring, and the plurality of grooves correspond to the plurality of winding plates one by one.

4. The winding body of a high voltage winding as claimed in claim 3, characterized in that The inner circumferences of the first fixing rings are provided with a plurality of third clamping grooves, the plurality of third clamping grooves are arranged along the radial direction of the first fixing ring and correspond to the plurality of winding plates one by one, and the plurality of third clamping grooves and the plurality of grooves communicate one by one, and the first fixing rings are clamped on the winding plates through the third clamping grooves and the first clamping grooves.

5. The winding body of a high voltage winding as claimed in claim 4, characterized in that 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 in the middle of the winding plate through the fifth clamping groove.

6. The winding body of a high voltage winding as claimed in claim 5, characterized in that The inner circumferences of the second fixing rings are provided with a plurality of fourth clamping grooves along the radial direction of the second fixing rings, the number of the fourth clamping grooves is equal to that of the winding plates, and the second fixing rings are clamped in the fifth clamping grooves through the fourth clamping grooves.

7. The winding body of a high voltage winding as claimed in claim 5, characterized in that The ring width of the second fixing ring is smaller than that of the first fixing ring.

8. The winding body of a high voltage winding according to claim 6, characterized in that At least one first mounting hole is arranged between the two adjacent third clamping grooves on the first fixing ring, and the first mounting hole is used for penetrating the air passage member.

9. The winding body of a high voltage winding according to claim 8, characterized in that At least one second mounting hole is arranged between the two adjacent fourth clamping grooves on the second fixing ring.

10. The winding body of a high voltage winding as claimed in claim 9, characterized in that The first mounting hole and the second mounting hole are the same in shape and number, and the first mounting hole and the second mounting hole are correspondingly arranged.

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