WO2023125633A1 - 高压绕组及制备高压绕组的方法 - Google Patents

高压绕组及制备高压绕组的方法 Download PDF

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Publication number
WO2023125633A1
WO2023125633A1 PCT/CN2022/142704 CN2022142704W WO2023125633A1 WO 2023125633 A1 WO2023125633 A1 WO 2023125633A1 CN 2022142704 W CN2022142704 W CN 2022142704W WO 2023125633 A1 WO2023125633 A1 WO 2023125633A1
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WO
WIPO (PCT)
Prior art keywords
winding
voltage
coil
wire
injection
Prior art date
Application number
PCT/CN2022/142704
Other languages
English (en)
French (fr)
Inventor
马斌
马婷婷
张鑫鑫
周曙琛
张小容
刘超
Original Assignee
江苏神马电力股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN202111644185.6A external-priority patent/CN114300238A/zh
Priority claimed from CN202111647805.1A external-priority patent/CN114300255B/zh
Priority claimed from CN202111644257.7A external-priority patent/CN114300254B/zh
Priority claimed from CN202111647803.2A external-priority patent/CN114300235A/zh
Application filed by 江苏神马电力股份有限公司 filed Critical 江苏神马电力股份有限公司
Priority to KR1020247017519A priority Critical patent/KR20240091014A/ko
Priority to JP2023546565A priority patent/JP2024506148A/ja
Priority to EP22914885.3A priority patent/EP4394818A1/en
Priority to AU2022427639A priority patent/AU2022427639A1/en
Priority to CA3241493A priority patent/CA3241493A1/en
Publication of WO2023125633A1 publication Critical patent/WO2023125633A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/22—Cooling by heat conduction through solid or powdered fillings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/076—Forming taps or terminals while winding, e.g. by wrapping or soldering the wire onto pins, or by directly forming terminals from the wire
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings

Definitions

  • the present application relates to the technical field of power transformers, in particular to a high-voltage winding and a method for preparing the high-voltage winding.
  • transformers can be divided into: oil-immersed transformers, dry-type transformers, and gas transformers.
  • Dry-type transformers have the advantages of no oil, fire prevention, long life, energy saving, low noise, simple maintenance, safety and reliability.
  • Most of the dry-type transformers currently on the market are dry-type transformers with resin-cast high-voltage windings and open dry-type transformers.
  • the purpose of this application is to provide a high-voltage winding and a method for preparing the high-voltage winding.
  • the coil of the high-voltage winding can be recycled, with low energy consumption, energy saving and environmental protection; the insulation layer is stable, the mechanical performance is good, and the service life is long.
  • a high-voltage winding including: a winding body, a high-voltage coil and a high-voltage insulating layer, wires are wound on the winding body to form the high-voltage coil, and the high-voltage insulating layer wraps the The high voltage coil and the winding body.
  • the winding body is made of fiber reinforced composite material.
  • the high voltage insulating layer is injection molded silicone rubber.
  • the winding body includes a winding portion
  • the high-voltage coil includes several sections of coils
  • several sections of the coils are wound on the winding portion and arranged at intervals along the axial direction of the high-voltage winding .
  • the wires include a first wire and a second wire, and the first wire is wound from the first end of the winding part to the winding part along the axial direction of the high voltage winding.
  • the second wire is wound from the middle part of the winding part to the second end of the winding part along the axial direction of the high voltage winding.
  • the inner turn wire end of the first wire located at the first end of the winding part forms a first outer connection exposed to the high voltage insulating layer
  • the second wire is located at the The outer turn wire end of the second end of the winding part forms a second outer connection exposed to the high voltage insulating layer.
  • the winding part includes several winding plates, and the winding plates are provided with several comb teeth, and the several winding plates are arranged along the circumferential direction of the high-voltage winding, and the winding plates At least one segment of the coil is arranged between two adjacent comb teeth on the top.
  • the height of the comb teeth along the axial direction of the high voltage winding is defined as the tooth height, the tooth height of the comb teeth in the middle of the winding board and the height of the comb teeth at both ends of the winding board
  • the tooth heights of the comb teeth are all greater than those of the other parts of the winding plate, so that the winding plate moves from one end to the other end in the axial direction of the high-voltage winding, forming a first high comb in turn. tooth area, the first low comb tooth area, the second high comb tooth area, the second low comb tooth area, and the third high comb tooth area.
  • each segment of the coil is reciprocally wound in layers along the axial direction of the high voltage winding.
  • the coil is provided with at least one interlayer insulating layer along the axial direction of the high voltage winding.
  • the interlayer insulating layer is an insulating long strip with wavy edges.
  • the high-voltage coil has the same width on each radial section thereof.
  • the injection-molded silicone rubber covers the high-voltage coil and the winding body through integral vacuum injection, and the injection-molded silicone rubber fills the gap between the high-voltage coil and the winding body and both ends of the winding body.
  • the winding body further includes: a support cylinder, the winding portion is disposed on the outer peripheral surface of the support cylinder, and the support cylinder is a hollow cylinder.
  • a method for preparing a high-voltage winding is provided, the high-voltage winding is the high-voltage winding described in any of the foregoing embodiments, and the method includes the following steps:
  • Step 1000 The wire is wound circumferentially along the outer peripheral surface of the winding body to form the high-voltage coil, and a tap is formed during the winding process of the wire;
  • Step 1100 placing the tap in the protective cavity of the tooling connector and connecting and fixing it with the tooling connector;
  • Step 1200 Put the winding body wound with the high-voltage coil as the body to be injected into the mold of the injection machine, and inject injection-molded silicone rubber around the body to be injected, so that the injection-molded silicone rubber is wrapped covering the high voltage coil and the winding body;
  • Step 1300 Remove the tooling connector to obtain the high voltage winding with the tap exposed to the injection molded silicone rubber.
  • the winding body includes a support cylinder and a winding part located on the outer peripheral surface of the support cylinder.
  • the wire is wound on the winding part to form the the high voltage coil.
  • the protection cavity is a stepped hole, and the tap is welded in the stepped hole.
  • the inner wall of the stepped hole is provided with threads, and before the step 1200, bolts are connected in the stepped hole.
  • the support cylinder and the winding part are made of glass fiber impregnated epoxy resin.
  • a plurality of the winding boards are evenly distributed in the circumferential direction and glued and fixed on the outer peripheral surface of the support cylinder.
  • step 1000 several winding grooves are opened on the winding board, so that the winding board forms several comb teeth.
  • the injection molded silicone rubber covers the high voltage coil and the winding body through integral vacuum injection and fills the space between the high voltage coil and the winding body The gap and the two ends of the winding body.
  • a method for preparing a high-voltage winding is provided, the high-voltage winding is the high-voltage winding described in any of the foregoing embodiments, the winding body includes auxiliary parts and winding parts, the The winding part is fixedly connected to the auxiliary part, and the high-voltage insulating layer wraps the high-voltage coil, the winding part and the auxiliary part. It is characterized in that the method includes the following steps:
  • Step 2000 paste a high temperature resistant film on the outer peripheral surface of the winding tool
  • Step 2100 Fix the winding body on the high temperature-resistant film, and make the auxiliary part stably fasten the winding part;
  • Step 2200 Wind the wire on the winding part to form the high voltage coil with a tap switch
  • Step 2300 Put the winding body wound with the high-voltage coil as the body to be injected together with the winding tooling into the injection machine, and inject injection-molded silicone rubber on the periphery of the body to be injected to form the high-voltage insulation layer to obtain the high-voltage winding;
  • Step 2400 Demoulding the high voltage winding from the winding tool.
  • the winding tooling includes a mold and a connecting rod, and the connecting rod passes through the mold along the axial direction of the mold.
  • the high temperature resistant film is made of a high temperature resistant Tape is fixed on the outer peripheral surface of the mould.
  • the auxiliary part includes a middle auxiliary part.
  • the middle auxiliary part is first sleeved on the high temperature resistant film, and then the winding part is placed along the winding
  • the circumferential setting of the manufacturing tooling makes the inner wall of the middle auxiliary part flush with the inner wall of the winding part.
  • the inner wall of the winding part is provided with a groove, and in the step 2100, the middle auxiliary part is snapped into the groove, so that the middle auxiliary part and the winding The line part is fixedly connected.
  • the auxiliary parts include end auxiliary parts.
  • the winding part is arranged along the circumferential direction of the winding tool, and then the end auxiliary parts are fixed. outside the end of the winding portion.
  • a slot is provided on the outside of the end of the winding part, and in the step 2100, the auxiliary end part is inserted into the slot.
  • the winding part includes several comb-shaped winding plates, and in the step 2100, several winding plates are arranged at intervals and evenly distributed on the outer peripheral surface of the winding tool in the circumferential direction.
  • step 2400 after the step 2400, it also includes:
  • Step 2500 trimming the remaining burrs of the high temperature resistant film on the inner surface of the high voltage winding.
  • the winding part or the auxiliary part is bonded to the high temperature resistant film.
  • Fig. 1 is a front view of a dry-type transformer according to an embodiment of the present application
  • Fig. 2 is a top view of a dry-type transformer according to an embodiment of the present application
  • Fig. 3 is a front view of an assembled iron core according to an embodiment of the present application.
  • Figure 4 is an enlarged view at G in Figure 2;
  • Fig. 5 is a front view of an iron core clip according to an embodiment of the present application.
  • Fig. 6 is a side view of an iron core clip according to an embodiment of the present application.
  • Fig. 7 is a schematic perspective view of a winding body according to an embodiment of the present application.
  • Fig. 8 is a cross-sectional view of a support cylinder according to an embodiment of the present application.
  • Fig. 9 is a schematic perspective view of a high-voltage coil wound on a winding body according to an embodiment of the present application.
  • Fig. 10 is a schematic perspective view of a high-voltage winding according to an embodiment of the present application.
  • Fig. 11 is a schematic perspective view of a tooling connector according to an embodiment of the present application.
  • Fig. 12 is a schematic circuit diagram of a high-voltage coil according to an embodiment of the present application.
  • Fig. 13 is a partial cross-sectional view of a high-voltage winding according to an embodiment of the present application.
  • Fig. 14 is a partial cross-sectional view of a high-voltage winding according to an embodiment of the present application.
  • Fig. 15 is a partial cross-sectional view of a high-voltage winding according to an embodiment of the present application.
  • Fig. 16 is a partial cross-sectional view of a high-voltage winding according to an embodiment of the present application.
  • Fig. 17 is a schematic perspective view of a winding body according to an embodiment of the present application.
  • Figure 18 is an enlarged view at H in Figure 17;
  • Fig. 19 is a schematic perspective view of a support cylinder according to an embodiment of the present application.
  • Figure 20 is an enlarged view at J in Figure 19;
  • Fig. 21 is a schematic perspective view of a winding part according to an embodiment of the present application.
  • Fig. 22 is a schematic perspective view of an auxiliary part according to an embodiment of the present application.
  • Fig. 23 is a schematic perspective view of a high-voltage winding according to an embodiment of the present application.
  • Fig. 24 is a schematic perspective view of a high-voltage coil wound on a winding part according to an embodiment of the present application
  • Fig. 25 is a schematic perspective view of the connection between the winding part and the auxiliary part according to an embodiment of the present application.
  • Fig. 26 is an enlarged schematic view of the fixed part of the winding part and the end auxiliary part in Fig. 25;
  • Fig. 27 is an enlarged schematic diagram of the fixed part of the winding part and the middle auxiliary part in Fig. 25;
  • Fig. 28 is a schematic perspective view of a high-voltage winding according to an embodiment of the present application.
  • Fig. 29 is a schematic perspective view of a winding tooling according to an embodiment of the present application.
  • Fig. 30 is a schematic perspective view of an auxiliary part and a winding board assembled on a winding tool according to an embodiment of the present application;
  • Fig. 31 is a schematic perspective view of a high-voltage coil wound on a winding tool according to an embodiment of the present application
  • Fig. 32 is a schematic diagram of an injection process according to an embodiment of the present application.
  • connection should be interpreted in a broad sense unless otherwise specified or limited, and may be a direct connection or a connection through an intermediary.
  • orientation or positional relationship indicated by “upper”, “lower”, “end”, “one end” etc. is based on the orientation or positional relationship shown in the drawings, and is only for It is convenient to describe the application and simplify the description, but not to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the application.
  • the dry-type transformer 10 is a three-phase transformer, including A phase, B phase and C phase. That is, the dry-type transformer 10 includes three single-phase transformers 100 . According to the structure of the iron core 110, the three transformers 100 can be arranged to form a linear structure or a triangular structure, and the three transformers 100 have a symmetrical structure. In addition, the dry-type transformer 10 may also be an isolation transformer, a frequency conversion transformer, a test transformer, and the like.
  • the dry-type transformer 10 includes an iron core 110 , three low-voltage windings 120 and three high-voltage windings 130 .
  • the iron core 110, the low-voltage winding 120, and the high-voltage winding 130 are arranged sequentially from inside to outside.
  • the iron core 110 includes three cylindrical iron core bodies 111 , an upper iron yoke 112 located at the upper end of the three cylindrical iron core bodies 111 , and a lower iron yoke 113 located at the lower end of the three cylindrical iron core bodies 111 .
  • a low-voltage winding 120 is provided on the outer periphery of each cylindrical iron core body 111 , and a high-voltage winding 130 is arranged on the outer periphery of each low-voltage winding 120 . That is, a low-voltage winding 120 and a high-voltage winding 130 are sheathed on each cylindrical iron core body 111 sequentially from inside to outside.
  • the iron core 110, the low-voltage winding 120, and the high-voltage winding 130 are arranged coaxially, that is, the three have the same axial direction.
  • the columnar iron core body 111 is formed by binding and fixing the stacked multi-layer silicon steel sheets with cable ties.
  • the radial cross section of the cylindrical iron core body 111 is substantially oval or circular or other shapes.
  • the radial section of the cylindrical iron core body 111 can be in a suitable shape according to actual needs, as long as the cylindrical iron core body 111 can be accommodated in the hollow cavity of the low voltage winding 120 , the present application does not limit this.
  • the upper iron yoke 112 and the lower iron yoke 113 are also formed of stacked multi-layer silicon steel sheets. Three cylindrical iron core bodies 111 are fixedly connected by an upper iron yoke 112 and a lower iron yoke 113 to form an iron core 110 .
  • an iron core clip 140 is provided on the outside of the iron core 110 , and the iron core clip 140 is used to clamp the iron core 110 .
  • the iron core clip 140 is formed by connecting three clips, all of which are plates, the clip in the middle is defined as the first clip 142, and the remaining two clips are defined as the second clip 143.
  • the two second clips 143 extend in the same direction on both sides of the connection between the first clip 142 and the two second clips 143, so that the iron core clip 140 has a structure similar to channel steel, that is, the iron core clip 140 It is in the shape of " ⁇ ".
  • the iron core clip can also be a closed hollow pipe, which has a more stable structure.
  • iron core clips 140 are provided, wherein two iron core clips 140 are symmetrically arranged on both sides of the upper end of the iron core 110, and are fixedly connected by a first fastener, to clamp the upper end of the iron core 110 (that is, the upper iron yoke 112).
  • the other two iron core clips 140 are symmetrically arranged on both sides of the lower end of the iron core 110 , and are fixedly connected by a second fastener to clamp the lower end of the iron core 110 (ie, the lower iron yoke 113 ).
  • both the first fastener and the second fastener adopt a plurality of screws and bolts that cooperate with each other to clamp both ends of the iron core 110 through the two iron core clips 140 respectively.
  • Both ends of the iron core clip 140 define first through holes 141 .
  • a first through hole 141 is respectively disposed at both ends of the first clip 142 .
  • the two iron core clips 140 at the lower end of the iron core 110 are also fixed and clamped to the lower end of the iron core 110 in the same way, and details are not repeated here.
  • the middle part of the iron core clamp 140 may also adopt several screws and bolts that cooperate with each other to clamp the middle part of the iron core 110 .
  • the second clip 143 is also provided with a second through hole (not shown in the figure) for connecting with the low voltage winding 120 .
  • the two iron core clips 140 at the upper end are located above the high voltage winding 130 disposed on the outer periphery of the iron core 110 .
  • the top of the high voltage winding 130 is provided with several insulating spacers 1001 for supporting the two iron core clips 140 at the upper end, and keeping the low voltage winding 120 and the high voltage winding 130 at a safe electrical distance from the upper iron yoke 112 respectively.
  • the two iron core clips 140 at the lower end are located below the high voltage winding 130 disposed on the outer periphery of the iron core 110 .
  • the tops of the two iron core clips 140 at the lower end are also provided with several insulating pads 1001 for supporting the low-voltage winding 120 and the high-voltage winding 130, and keeping the space between the low-voltage winding 120 and the high-voltage winding 130 and the lower iron yoke 113 respectively electrical distance.
  • the insulating spacer 1001 is made of an insulating material, such as a low-shrinkage unsaturated polyester glass fiber reinforced mold such as a dough molding compound (DMC: Dough Molding Compound) or a sheet molding compound (SMC: Sheet Molding Compound). Plastic or, for example, cast from epoxy resin.
  • the core clip 140 is made of fiber reinforced composite material.
  • the iron core clip 140 may be molded by glass fiber impregnated with epoxy resin, or made of aramid fiber impregnated with epoxy resin.
  • the iron core clip 140 can also be made of other composite materials.
  • the first clip 142 and the second clip 143 are integrally formed.
  • Fiber-reinforced composite materials refer to composite materials formed by reinforcing fiber materials, such as glass fibers, aramid fibers, etc., and matrix materials through winding, molding or pultrusion molding processes.
  • the iron core clip 140 made of fiber-reinforced composite materials has low cost, light weight, and good mechanical properties, and the production process of fiber-reinforced composite materials has low carbon emissions, and is greener and more environmentally friendly.
  • the low-voltage winding 120 includes copper foil 121 , low-voltage insulating layers 122 and support bars 123 , and the copper foils 121 and low-voltage insulating layers 122 are arranged alternately.
  • the copper foil 121 is formed by winding a whole piece of copper foil paper, and the low-voltage insulating layer 122 is overlapped with the copper foil 121 and then wound together.
  • At least one heat dissipation air passage is provided in the low voltage winding 120 , and the heat dissipation air passage is located between the adjacent copper foil 121 and the low voltage insulating layer 122 .
  • the support bar 123 is located in the heat dissipation air channel, and is used for supporting and isolating the adjacent copper foil 121 and the low-voltage insulating layer 122 . At least two support bars 123 are arranged in each layer of heat dissipation air passages. Optionally, two, three, four or more support bars 123 may be provided. Preferably, a plurality of support bars 123 of the same layer are arranged at equal intervals along the circumferential direction of the outer peripheral surface of the copper foil 121 .
  • the purpose of the heat dissipation air passage is to help release the heat generated by the low-voltage winding 120 during the operation of the dry-type transformer 10 , so as to prevent the dry-type transformer 10 from overheating and failing due to heat accumulation.
  • one layer or two or more layers may be provided for the heat dissipation air passage, which is not limited here.
  • the low-voltage insulating layer 122 is made of polyimide impregnated paper, specifically SHS-P diphenyl ether prepreg material, which is made of polyimide film and polysulfone fiber non-woven soft composite material impregnated with diphenyl ether resin and then baked.
  • the low-voltage insulating layer can also use DMD insulating paper or silicon rubber film, or other insulating materials, which can be selected according to the different temperature rise levels of the dry-type transformer.
  • the support bar 123 is made of glass fiber impregnated with epoxy resin, or made of aramid fiber impregnated with epoxy resin.
  • the support bar 123 is a long bar with an I-shaped cross section, and the mechanical strength is more stable.
  • the support bar may also be a long bar with a square or other shape in cross section, as long as it can play the role of support and isolation.
  • the inner ring layer of the low-voltage winding 120 is also provided with an inner lead copper bar
  • the outer ring layer of the low-voltage winding 120 is also provided with an outer lead copper bar
  • the free ends of the inner lead copper bar and the outer lead copper bar are provided with connection holes. After matching with the second through hole on the iron core clip 140 , fasten the connection.
  • the high-voltage winding 130 includes a winding body 1310 , a high-voltage coil 1320 and a high-voltage insulating layer 1330 , and wires are wound on the winding body 1310 to form the high-voltage coil 1320 .
  • the winding body 1310 includes a support cylinder 1311 and a winding portion 1312 .
  • the support cylinder 1311 is a hollow cylinder, which may be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylinders.
  • the wire winding portion 1312 is disposed on the outer peripheral surface of the support cylinder 1311 , and the wire is wound in the wire winding portion 1312 to form a high voltage coil 1320 .
  • the high-voltage coil 1320 includes several sections of coils, and the several sections of coils are arranged at intervals along the axial direction of the support cylinder 1311 .
  • the axial direction of the winding body 1310 is the same as the axial direction of the high voltage winding 130 .
  • the wire winding part 1312 includes several wire winding plates 1313 , and the several wire winding plates 1313 are arranged on the outer peripheral surface of the support cylinder 1311 at equal intervals in the circumferential direction of the support cylinder 1311 .
  • Each winding plate 1313 extends axially along the support cylinder 1311 , and the axial extension length of the winding plate 1313 along the support cylinder 1311 is smaller than the axial extension length of the support cylinder 1311 .
  • the number of winding boards 1313 is at least two.
  • the number of winding boards 1313 may be two, three, four or more, which is not limited here.
  • the number of winding boards 1313 of the dry-type transformer (for example, 10kV/1000kVA dry-type transformer) is set to twelve, so as to ensure reliable winding of wires and save material as much as possible.
  • the extension length of the winding plate along the axial direction of the support cylinder may also be equal to the axial extension length of the support cylinder.
  • the winding plate 1313 is a rectangular plate, and the longer side of the winding plate 1313 is arranged along the axial direction of the support cylinder 1311, that is, the length direction of the winding plate 1313 is arranged along the axial direction of the support cylinder 1311, and the winding plate 1313 is also provided with There are several winding grooves 1314, and several winding grooves 1314 extend along the radial direction of the support cylinder 1311 and are distributed at intervals along the axial direction of the support cylinder 1311, so that the winding plate 1313 is comb-shaped, that is, the winding plate 1313 is formed with Several comb teeth.
  • the height of the comb teeth on the winding plate 1313 along the axial direction of the support cylinder 1311 is defined as the tooth height.
  • the tooth heights of the comb teeth at both ends of the winding plate 1313 and the tooth heights of the comb teeth in the middle of the winding plate 1313 are greater than The tooth height of the other parts of the comb.
  • the tooth height at both ends of the winding plate 1313 is set to a greater uniform electric field, and the middle part of the winding plate 1313 needs to lead out the tap of the tap wire, and the winding plate 1313 If the tooth height in the middle part is set larger, the distance between the corresponding two adjacent winding slots 1314 is also larger, which can reserve space for the taps drawn from the middle of the winding plate 1313 .
  • the comb tooth area with slightly larger tooth height is defined as the high comb tooth area
  • the comb tooth area with slightly smaller tooth height is defined as the low comb tooth area.
  • the winding plate 1313 is formed in sequence from one end to the other end along the axial direction of the support cylinder 1311, forming the first high comb area, the first low comb area, the second high comb area, and the second low comb area.
  • the tooth heights of the first high-comb-tooth region, the second high-comb-tooth region and the third high-comb-tooth region are not specifically limited, for example, they may be the same or different from each other.
  • the first high-comb-tooth area and the third high-comb-tooth area can be arranged symmetrically with respect to the second high-comb-tooth area, and the first low-comb-tooth area and the second low-comb-tooth area can also be arranged with respect to the second high-comb-tooth area
  • the symmetrical arrangement makes the high-voltage coil 1320 symmetrically arranged in the axial direction of the high-voltage winding 130. At this time, the center of gravity of the high-voltage winding 130 is located at the center of the high-voltage winding 130, which is convenient for hoisting and transportation of the high-voltage winding 130.
  • the first high comb-tooth region, the first low comb-tooth region, the second high comb-tooth region, the second low comb-tooth region, and the third high-comb-tooth region may be arranged asymmetrically, which is not limited here.
  • the tooth heights of the comb teeth in each region may also be set at the same height or in other ways, which is not limited here.
  • At least one section of coil is arranged between two adjacent comb teeth on the winding plate 1313, so that each winding slot 1314 is wound with a wire, and the high-voltage coils 1320 are arranged in a reasonable distribution, and each section of coil is arranged at intervals.
  • the winding boards 1313 are arranged at equal intervals on the outer peripheral surface of the supporting cylinder 1311 in the circumferential direction of the supporting cylinder 1311, and the two ends of each winding board 1313 are flush with each other, and the winding slots 1314 on each winding board 1313
  • each section of coil is wound by wires along the circumference of the support cylinder 1311 in a corresponding circle of winding grooves 1314 on all the winding plates 1313, the force is balanced and the mechanical strength is good.
  • each tap can be drawn from between two adjacent winding boards with a larger spacing, so that the tooth height of the comb teeth in the middle of the winding board does not need to be set larger, and the setting position of each tap can be reserved.
  • the wire winding plate may also be an annular disk member circumferentially arranged around the support cylinder.
  • Several winding boards are arranged at intervals along the axial direction of the support cylinder, and the wires are wound in grooves formed by two adjacent winding boards.
  • the support cylinder 1311 is a hollow tube impregnated with glass fiber impregnated with epoxy resin, wound and cured or pultruded, or a hollow tube formed of glass fiber or aramid fiber impregnated with epoxy resin, pultruded, or aramid.
  • a hollow tube made of nylon fiber impregnated with epoxy resin by winding and curing or pultruded, or made of other composite materials, is not limited here.
  • the supporting cylinder 1311 and the winding board 1313 are two parts formed independently, and the two are fixed by bonding.
  • the winding plate 1313 is also made of glass fiber impregnated with epoxy resin, and is laminated to a certain thickness by impregnating epoxy resin with multiple layers of glass fiber cloth, and molded and solidified to form a rectangular glass steel plate, and a winding groove 1314 is set on the glass steel plate Specifically, the winding groove 1314 can be turned to form the winding plate 1313, and the winding plate 1313 is fixedly connected to the outer peripheral surface of the support cylinder 1311 by an adhesive, thereby saving manufacturing materials and cost to the greatest extent.
  • the adhesive is a two-component high-temperature-resistant epoxy glue, and of course other adhesives can also be used, but it must be ensured that the adhesive can firmly bond the support cylinder 1311 and the winding plate 1313, and is resistant to High temperature, so as to adapt to the high temperature injection of the high voltage insulating layer 1330 outside the winding body 1310 .
  • the winding plate 1313 is molded and solidified.
  • the winding board can also be integrally cast and solidified to directly form a comb-shaped winding board, which simplifies the process, and the material of the winding board is the same as the above, and will not be described again.
  • the support cylinder 1311 and the winding plate 1313 are integrally formed. Glass fiber or aramid fiber impregnated with epoxy resin is pultruded or wound into a hollow tube with a large thickness, and then the hollow tube is turned to form the support cylinder 1311 and the winding plate 1313.
  • the amount of material used in this way is relatively high , but the strength between the support cylinder 1311 and the winding plate 1313 can be ensured to prevent damage to the connection between the support cylinder 1311 and the winding plate 1313 due to weak bonding or subsequent injection of the high voltage insulating layer 1330 .
  • the winding body 1310 further includes two flanges 1315, and the two flanges 1315 are respectively arranged at the two ends of the support cylinder 1311, and Extending outward along the radial direction of the support cylinder 1311 forms an annular disk surface.
  • the flanges 1315 at both ends are arranged oppositely.
  • the winding plate 1313 is damaged due to the high injection pressure during the process of the high voltage insulating layer 1330 .
  • the outer end surfaces of the two ends of the winding plate 1313 may not be in contact with the disk surfaces of the two flanges 1315 opposite to each other, that is, the outer end surfaces of the two ends of the winding plate 1313 and the flanges 1315 are facing the side of the winding plate 1313.
  • There is a gap between the disk surfaces which is not limited here.
  • the flanging 1315 is made of glass fiber impregnated with epoxy resin, integrally formed with the support cylinder 1311, that is, pultruded or wound through glass fiber or aramid fiber impregnated with epoxy resin, and then processed and polished into a disc with a certain thickness .
  • 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, can effectively support the winding of the wire, is not easy to be damaged, and avoids high-temperature vulcanized silicone rubber
  • the injection impact generated when the winding body 1310 is injected outside the wire will disperse and displace the wire; and the fiber-reinforced composite material has good heat resistance, which prevents the winding due to excessive heat generated by the high-voltage coil 1320 during the operation of the dry-type transformer 10.
  • Body 1310 deforms.
  • the A-phase transformer 100 is taken as an example for description.
  • the wire is wound circumferentially on the outer peripheral surface of the winding body 1310 to form the high voltage coil 1320 .
  • the wire is wound in the winding slot 1314 of the wire winding part 1312, so that the high-voltage coil 1320 is distributed at intervals in the axial direction of the support cylinder 1311, and two external terminals are formed at the head and tail ends of the wire after the winding is completed, respectively
  • the first external terminal D and the second external terminal X the first external terminal D is used to connect cables, and the second external terminal X is used to connect other external wires, such as in a three-phase transformer, for connection with each phase transformer interconnected.
  • tap 2 tap 3 tap 4 tap 6 are defined as the first tap changer
  • tap 3 tap 5 and tap 7 are defined as the second tap changer.
  • the wires include a first wire and a second wire, both of which are continuous wires, and the first wire and the The second wires are covered with an insulating layer.
  • the insulating layer may be a polyimide film or a glass fiber film, or may be an insulating material such as polyester varnish, or may be used in combination of various insulating materials, which is not limited here.
  • the first wire is wound from one end of the wire winding part 1312 to the middle of the wire winding part 1312 along the axial direction of the support cylinder 1311, and leads out to three taps. Referring to Fig.
  • the upper end of the winding part 1312 is defined as the first end
  • the lower end of the winding part 1312 is defined as the second end
  • the first wire is from the first end of the winding part 1312 to the winding part 1312
  • the second end of the coil starts to be wound, and the first wire winds the coil with the designed number of turns in the winding groove circle formed by the first winding groove 1314 on all the winding boards 1313 to form the first segment coil 1321, and the first segment
  • the coil 1321 is a pie coil. Only one pie coil is set in each winding slot 1314 , that is, each section of coil has only one pie coil.
  • the inner turn wire end of the first wire located at the first end of the winding part 1312 forms the first external terminal D exposed outside the high-voltage insulating layer 1330, that is, the inner turn wire end of the first coil 1321 (that is, the first wire).
  • the first end of the first external terminal D is drawn out, and the outer turn wire end of the first section of coil 1321 extends to all the winding slots formed by the second winding slot 1314 on the winding board 1313 to continue winding to form the second section Coil 1322, and so on, until the first wire is wound to the middle of the winding body 1310, and three taps are respectively drawn out through the outer turn wire ends of the three sections of coils, that is, tap 6, taps as shown in Figure 12 4 and tap 2, so far the winding of the first wire is completed.
  • the second wire is wound from the middle of the wire winding part 1312 to the second end of the wire winding part 1312 along the axial direction of the support cylinder 1311, and leads out to three other taps.
  • the second wire begins to be wound in the winding slot circle formed by the next winding slot 1314 adjacent to the tap 2 to form a third segment coil 1323, and the second wire is wound in the same way as the first wire way to continue winding to the second end of the winding part 1312, and the other three taps are respectively drawn from the three coils starting from the third coil 1323, that is, the tap 3, the tap 5 and the tap 7, until the second end
  • the wire is wound into the winding slot circle formed by the last winding slot 1314 on each winding board 1313 at the second end of the winding portion 1312 , and forms a terminal segment coil 1324 .
  • the outer turn wire end of the second wire located at the second end of the winding part 1312 forms the second external terminal X exposed outside the high voltage insulating layer 1330, that is, the outer turn wire end of the terminal section coil 1324 (that is, the end of the second wire ) to lead out the second external terminal X, so far the winding of the second wire is completed.
  • the wire When the wire is wound, it is wound in the winding slots formed by the winding slots 1314 of all the winding plates 1313, so that each segment of the coil formed by the wire winding is perpendicular to the axial direction of the support cylinder 1311, which is convenient and The wires are neatly arranged, the winding plate 1313 and the supporting cylinder 1311 are evenly stressed, and the mechanical strength is good.
  • a cake-type high-voltage coil 1320 is formed.
  • This coil structure has better mechanical strength and a strong ability to withstand the electromotive force generated by short-circuit current. better.
  • the tap 6, the tap 4 and the tap 2 are sequentially distributed to form the first tap changer, the tap 3, the tap 5 and the tap 7 are distributed sequentially to form the second tap changer, and the first tap changer and the second tap changer are arranged in parallel, and the six taps form a tap device for the high-voltage coil 1320, which is used to adjust the dry-type transformer 10 according to different operating conditions Voltage.
  • the wire is wound on the winding body 1310 to form a high-voltage coil 1320, so that the high-voltage coil 1320 is annular, and the ring width of the high-voltage coil 1320 is defined as the width of the high-voltage coil 1320, then the high-voltage coil 1320 on each radial section thereof
  • the widths are uniform, that is, the outer surface of the high-voltage coil 1320 is equidistant from the outer peripheral surface of the support cylinder 1311, so that the overall force of the high-voltage coil 1320 is balanced.
  • the widths of the coils in the radial section may not be completely the same, as long as they are approximately the same.
  • the second wire is wound from the winding slot circle formed by the next winding slot 1314 adjacent to the tap 2 to the winding formed by the last winding slot 1314 at the second end of the winding part 1312.
  • the second wire can also be wound upwards from the winding slot formed by the last winding slot at the second end of the winding part to the winding slot formed by the next winding slot adjacent to the tap 2.
  • the winding groove circle only the second external terminal X is formed first, and then the tap 7 , the tap 5 and the tap 3 are sequentially formed.
  • the winding method of the high voltage coil 1320 is not limited to the above methods, and other methods can also be used to form pie coils or layer coils, as long as the high voltage winding 130 can be finally formed.
  • the tap changer includes six taps. At this time, the dry-type transformer 10 has five gears to adjust the voltage. In other embodiments, the tap changer may also include four taps, that is, the first tap The tap changer and the second tap changer respectively include two taps. At this time, the dry-type transformer includes three gears to adjust the voltage, as long as it meets the actual use requirements of the dry-type transformer, and there is no limitation here.
  • the high-voltage insulating layer 1330 wraps the high-voltage coil 1320 and the winding body 1310 to form a high-voltage winding 130 .
  • the high voltage insulating layer 1330 is injection molded silicone rubber, such as high temperature vulcanized silicone rubber or liquid silicone rubber for injection. Injection molding silicone rubber is molded by injection technology, with fast molding speed, high production efficiency, no cracks, air gaps, and small partial discharge of the product; and because it is a silicone rubber elastomer, after assembly, the parts connected to the high-voltage winding 130 and various components are all The elastic vibration reduction can be realized, and the noise during the operation of the dry-type transformer 10 is greatly reduced.
  • the wire is wound on the winding body 1310 to form a high-voltage coil 1320, and the winding body 1310 and the high-voltage coil 1320 are used as the body to be injected, and the body to be injected is put into the injection molding machine.
  • the high-voltage winding 130 is obtained by adding silicone rubber raw materials and injecting high-temperature vulcanized silicone rubber on the outer periphery of the body to be injected as a whole.
  • the high-voltage insulating layer 1330 is made of high-temperature vulcanized silicon rubber, which improves the insulation performance and mechanical performance of the high-voltage winding 130 as a whole.
  • the high-temperature vulcanized silicone rubber according to the embodiment of the present application adopts a high-temperature vulcanized silicone rubber material system, which specifically includes raw rubber, reinforcing agent, flame retardant, heat-resistant agent and other auxiliary materials.
  • the high-temperature vulcanized silicone rubber After covering the high-voltage coil 1320 and the winding body 1310 through the overall vacuum injection of high-temperature vulcanized silicone rubber, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the winding body 1310 and wraps both ends of the winding body 1310, and high-temperature vulcanization
  • the silicone rubber does not cover the inner wall of the support cylinder 1311 , so that the high voltage winding 130 has a hollow column shape as a whole.
  • the high voltage winding 130 may be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylinders.
  • the six taps are connected by setting the tooling connector 101 to prevent the six taps from being covered by the silicone rubber during the injection process and being unable to be used for wiring.
  • the tooling connector 101 is an aluminum alloy plate, and a protective cavity is provided on the plate surface of the tooling connector 101 , and the tap is connected and fixed in the protective cavity.
  • the protection cavity is six identical stepped holes 1011, and the inner walls of the stepped holes 1011 are also provided with threads.
  • the six taps are respectively connected to the six stepped holes 1011 , which can be connected by welding or fixedly connected by other methods, which is not limited here.
  • the six stepped holes 1011 on the tooling connector 101 are arranged in parallel in two rows, and three stepped holes 1011 are arranged in each row so that the first tap changer and the second tap changer are also arranged in parallel.
  • bolts are connected in the six stepped holes 1011, so that the bolts can directly fill the remaining space of the stepped holes 1011, preventing silicone rubber from filling the six steps hole 1011, so as to prevent the six taps from being unable to be used for wiring after being covered by silicon rubber.
  • the two opposite sides of the tooling connector 101 are also provided with two symmetrical connecting grooves 1012, and the injection mold is correspondingly provided with two connecting blocks.
  • the two connection grooves 1012 are respectively clamped and connected with the two connection blocks on the injection mold, so that the tooling connector 101 is fixed in the injection mold, and the position of the tooling connector 101 is prevented from being damaged due to the relatively large injection pressure during the injection of silicone rubber. Offset occurs.
  • two symmetrical connection blocks can also be provided on two opposite sides of the tooling connector, and two connecting grooves are correspondingly provided in the injection mold.
  • the tooling connector When the tooling connector is placed in the injection mold, the tooling The two connecting blocks on the connecting piece are respectively clamped and connected with the two connecting grooves on the injection mold, so that the tooling connecting piece is fixed in the injection mold, preventing the tooling connecting piece from being damaged due to the large injection pressure during the injection of silicone rubber. position shifted.
  • a small amount of silicone rubber is coated on the side of the tooling connector 101. Since the silicone rubber coated on the tooling connector 101 is relatively small, the tooling connector 101 can be removed directly by tools to expose The first tap changer and the second tap changer finally form a high voltage winding 130 as shown in FIG. 10 .
  • one tooling connector 101 is provided.
  • two tooling connectors can also be set.
  • the size of the tooling connector is set smaller, and three tooling connectors are provided on each
  • the six taps are respectively connected to the six stepped holes, and there is no limitation here.
  • FIG. 13 shows a partial cross-sectional view of the high-voltage winding 130 covered with a high-voltage insulating layer 1330 cut along its axial direction.
  • the wire adopts the winding method described in the previous embodiment, and is wound in the comb-shaped winding plate 1313 to form a cake-shaped high-voltage coil 1320.
  • the cake-shaped high-voltage coil 1320 and the winding wire The comb teeth of the plate 1313 are arranged at intervals, that is, a cake coil is arranged between two adjacent comb teeth.
  • FIG. 14 shows a partial cross-sectional view of the high-voltage winding 230 covered with a high-voltage insulating layer 2330 cut along its axial direction.
  • the wire is wound on the comb-shaped winding plate 2313 by double-winding continuous winding to form a high-voltage coil 2320 .
  • Two identical continuous wires are arranged adjacent to each other and then wound from a circle of winding slots 2314 corresponding to the upper ends of all winding boards 2313 to form a first section of coil 2321.
  • the first section of coil 2321 includes an To the two pie coils arranged next to each other, the specific winding method is the same as that of the high-voltage coil 1320 in the previous embodiment, and the coils are wound downwards by analogy, and continue to form the second coil 2322 and other coils until the high-voltage coil 230 along the axis of the high-voltage coil 230 is formed.
  • each segment of the coil includes two pie coils arranged in close proximity, and the length of each segment of the coil along the axial direction of the winding plate 2313 is equal to the sum of the widths of the two parallel wires along the axial direction of the support cylinder 2311, that is, Two cake coils are arranged between two adjacent comb teeth on the winding plate 2313 .
  • the same two wires refer to the same size and material of the two wires.
  • the number of winding slots 2314 can be reduced, thereby reducing the interval between each segment of the coil.
  • the transition section between the wires thereby reducing the amount of wires, to achieve the purpose of reducing costs.
  • three pie coils or more pie coils may also be arranged between two adjacent comb teeth on the winding board.
  • FIG. 15 shows a partial cross-sectional view of a high-voltage winding 330 covered with a high-voltage insulating layer 3330 cut along its axial direction.
  • the width of the winding groove 3314 on the winding plate 3313 along the axial direction of the support cylinder 3311 is greater than the width of the winding groove 2314 on the winding plate 2313 along the axial direction of the support cylinder 2311 .
  • the wire first forms the first section of coil 3321 through the layer winding method.
  • a continuous wire is used, and in the first winding slot 3314 corresponding to the upper end of all winding boards 3313, along the axial direction of the support cylinder 3311
  • the upper end of the first winding slot 3314 is wound continuously downward until the wire is wound to the lower end of the first winding slot 3314 to form the first layer of coil, and the wire of the first layer of coil is on the outer periphery of the support cylinder 3311
  • the surface is tightly arranged in a helical shape.
  • the coils are reciprocated until the first section of coil 3321 reaches the preset width of the high-voltage coil 3320 in the radial direction of the support cylinder 3311 , and finally the first section of coil 3321 is tightly arranged in a helical shape on the outer peripheral surface of the support cylinder 3311 .
  • the wire transitions to the second winding slot 3314 through the comb teeth of the winding plate 3313, and continues winding to form the second coil 3322 according to the layer winding method, and continues winding by analogy until all the winding slots 3314 are completed.
  • the inner wire is wound to form the high voltage coil 3320 at last.
  • each segment of the coil is arranged in a spiral shape along the axial direction of the winding plate 3313, and the length of each segment of the coil along the axial direction of the winding plate 3313 is greater than that of two parallel wires
  • the sum of the widths forms a multi-segment cylindrical high-voltage coil 3320.
  • the high-voltage winding of the same specification Compared with the pie-shaped structure (that is, the structure of the high-voltage coil 2320 in the previous embodiment) wound by the double-winding continuous winding method, the high-voltage winding of the same specification Among them, the high-voltage coil 3320 is more compact, and the number of winding slots 3314 is less, so that the amount of wires is also less, further reducing the cost.
  • the winding plate 3313 by setting the winding plate 3313 , comb teeth are separated between the first segment coil 3321 and the second segment coil 3322 .
  • the winding plate may not be provided, and there is a gap between the first section of coil and the second section of coil, and finally the high-voltage coil is fixed by filling the high-voltage insulating layer, and the purpose of insulation between high-voltage coil sections can also be achieved. .
  • FIG. 16 shows a partial cross-sectional view of a high-voltage winding 430 covered with a high-voltage insulating layer 4330 cut along its axial direction.
  • the forming method of the high-voltage coil 4320 is consistent with the forming method of the high-voltage coil 3320 in the foregoing embodiments, and will not be repeated here.
  • the length of each segment of the coil of the high-voltage coil 4320 along the axial direction of the support cylinder 4311 is greater than the length of each segment of the coil of the high-voltage coil 3320 along the axis of the support cylinder 3311.
  • Dry-type transformers 10 of the same voltage level and segmented cylindrical high-voltage coils The 4320 has fewer segments. Since the length of each segment of the high-voltage coil 4320 along the axial direction of the support cylinder 4311 is greater, the voltage difference between each segment of the coil is greater, so an insulating layer needs to be added between the layers of each segment of the coil to reduce the voltage difference , at this time, each segment of the coil is provided with an interlayer insulating layer 4301 along the axial direction of the high voltage winding 430 to prevent the interlayer electric field strength from being higher than the withstand critical value of the insulating film coated with the insulated wire.
  • the layered structure in each segment of the coil has a good ability to resist lightning shocks, and the economic advantages are more obvious.
  • the interlayer insulation layer 4301 is placed on the corresponding position and then the wire is wound continuously, so that the interlayer insulation layer 4301 can be disposed in each segment of the coil.
  • the interlayer insulating layer 4301 can be grid cloth, or insulating struts arranged at intervals in the circumferential direction, or other hard insulating materials.
  • the insulating stay is a long insulating strip with wavy edges, which can prevent the insulating supporting bar from being damaged due to extremely high injection pressure when injecting high-temperature vulcanized silicone rubber to form a high-voltage insulating layer.
  • the insulating support bar is made of hard insulating material, which can resist the impact force of silicone rubber when it is injected at high temperature.
  • the interlayer insulating layer 4301 may be provided as one layer, or may be provided as two layers or three layers, depending on different design situations, which is not limited here.
  • the winding body 5310 is similar in structure to the winding body 1310 in the previous embodiment, the difference is that the supporting cylinder 5311 and the winding part 5312 are engaged.
  • the winding body 5310 also includes an auxiliary piece 5316, which is located in the middle of the outer peripheral surface of the support cylinder 5311 and extends outward along the radial direction of the support cylinder 5311, so that the auxiliary piece 5316 surrounds the support cylinder 5311 and In the form of a ring-shaped disk.
  • a slot is provided on the winding board 5313 or the auxiliary part 5316, and the winding board 5313 and the auxiliary part 5316 are connected through the slot.
  • each winding plate 5313 is provided with a first slot 53131, and the position of the first slot 53131 is matched with the auxiliary part 5316, so that the auxiliary part 5316 is stuck in each first slot 53131 inside.
  • the longer side of the winding plate 5313 is arranged along the axial direction of the support cylinder 5311, and several winding grooves 5314 are arranged along the radial direction of the support cylinder 5311 and distributed at intervals along the axial direction of the support cylinder 5311, so that the winding plate 5313 forms a number of comb teeth .
  • the first locking slot 53131 is located on the winding plate 5313 and is set opposite to the winding slot 5314, that is, the first locking slot 53131 is arranged along the radial direction of the support cylinder 5311, and the first locking slot 53131 is located on the winding plate 5313 close to the support
  • the side surface of the barrel 5311 enables the auxiliary piece 5316 protruding from the outer peripheral surface of the supporting barrel 5311 to be locked in the first engaging groove 53131 .
  • the auxiliary part 5316 can maintain the stable setting of the winding board 5313, avoiding the movement and dislocation of the winding board 5313 during the wire winding process and the injection process of the high-voltage insulating layer.
  • the first locking slot 53131 is located in the middle of the winding plate 5313, and in the radial direction of the supporting cylinder 5311, the first locking groove 53131 extends from the side of the winding plate 5313 close to the supporting cylinder 5311 to one of the middle positions of the winding plate 5313 On the comb teeth, or in the radial direction of the support cylinder 5311, the first locking groove 53131 is arranged flush with a comb tooth in the middle of the winding plate 5313 but does not extend to the comb teeth.
  • the tooth height is relatively large, which can further reduce the influence of the first locking groove 53131 on the mechanical strength of the winding plate 5313 .
  • the groove depth of the first clamping groove 53131 in the radial direction of the support cylinder 5311 matches the width of the auxiliary piece 5316 protruding from the support cylinder 5311, so that after the auxiliary piece 5316 is assembled with the winding plate 5313, the outer surface of the auxiliary piece 5316 is aligned with the width of the support cylinder 5311.
  • the inner surface of the first card slot 53131 is close to each other, with good mechanical strength and reliable fastening. If the groove depth of the first clamping groove 53131 is smaller than the width of the auxiliary part 5316 protruding from the supporting cylinder 5311, there will be a gap between the winding plate 5313 and the supporting cylinder 5311, and there will be windings during the wire winding process and the high-voltage insulating layer injection process.
  • the auxiliary part 5316 is made of glass fiber impregnated with epoxy resin, which is molded to form a ring part with a certain thickness, and then the auxiliary part 5316 is fixedly connected to the outer peripheral surface of the support cylinder 5311 by an adhesive to maximize the Save materials and save costs.
  • the auxiliary part can also be integrally formed with the support cylinder, that is, a hollow tube with a relatively large thickness is firstly made, and then turned to form the winding plate 5313 and the auxiliary part 5316 at the same time.
  • an auxiliary piece 5316 and a set of first engaging slots 53131 are provided.
  • a plurality of auxiliary parts such as two or three, may also be provided.
  • multiple sets of first locking grooves such as two or three sets, may be correspondingly arranged at intervals along the axial direction of the support cylinder.
  • each set of auxiliary parts and the first clamping grooves are distributed at intervals along the axial direction of the support cylinder, effectively evenly distributing the bearing strength of the winding board, and making the structure of the winding board more stable.
  • one auxiliary piece is respectively provided at the middle part and two ends of the outer peripheral surface of the support cylinder, and each winding board is correspondingly provided with three first locking slots.
  • the difference from the support cylinder 5311 in the previous embodiment is that several second slots 63161 are provided on the auxiliary part 6316 on the outer peripheral surface of the support cylinder 6311, Moreover, several second card slots 63161 are arranged at equal intervals in the circumferential direction of the auxiliary member 6316, that is, each second card slot 63161 matches and corresponds to one winding board. In such an embodiment, there is no need to open a slot on the winding board, and the winding board is directly locked in the second slot 63161 .
  • auxiliary part 6316 is the same as those of the auxiliary part 5316 in the foregoing embodiments, and will not be repeated here.
  • the winding body may not be provided with a supporting cylinder, that is, the winding body omits the structure of the rigid insulating inner lining cylinder, so that the heat conduction effect of the high-voltage winding is better , eliminating the interface between the high-voltage insulating layer and the rigid insulating lining, thereby suppressing the surface discharge of the rigid insulating lining, saving materials and reducing costs.
  • the winding body includes a winding part 7310 and several auxiliary parts 7312
  • the winding part 7310 includes several comb-shaped winding plates 7311.
  • the auxiliary pieces 7312 are annular and arranged at intervals along the axial direction of the auxiliary pieces 7312 .
  • Winding plate 7311 is fixed on the outer periphery of several auxiliary parts 7312 along the axial direction of auxiliary part 7312, and each winding plate 7311 connects all auxiliary parts 7312 simultaneously.
  • Several winding boards 7311 are arranged at equal intervals along the circumference of the auxiliary part 7312 .
  • the axial direction of the auxiliary part 7312 is the axial direction of the winding portion 7310, that is, the axial direction of the high voltage winding.
  • the shape of the auxiliary part 7312 can be designed according to the overall shape of the high-voltage winding, for example, it can be designed as a circular ring, an elliptical ring, and the like.
  • a number of winding plates 7311 are arranged along the circumferential direction of the auxiliary part 7312, and the wire is wound on the winding part 7310 to form a high-voltage coil, and the high-voltage coil includes several sections of coils, and several sections of coils are arranged at intervals along the axial direction of the high-voltage winding.
  • the auxiliary part 7312 can maintain the stable setting of the winding plate 7311, avoiding the movement and dislocation of the winding plate 7311 during the wire winding process and the injection process of the high-voltage insulating layer.
  • the outer surface of the auxiliary part 7312 is provided with a plurality of third locking grooves 73121 , and the third locking grooves 73121 are arranged at equal intervals along the circumferential direction of the auxiliary part 7312 .
  • the third slots 73121 of the auxiliary parts 7312 are aligned with each other in the axial direction of the auxiliary parts 7312 to form a plurality of third slot rows, and the number of the third slot rows corresponds to the number of the winding boards 7311 .
  • Each winding board 7311 is locked in a corresponding third slot row, so that the winding boards 7311 are arranged on the outer circumference of the auxiliary parts 7312 at equal intervals in the circumferential direction.
  • both ends of all the winding boards 7311 are flush, and the third slots 73121 on all the auxiliary parts 7312 are aligned with each other in the axial direction of the auxiliary parts 7312, so that each winding board 7311 can move along the auxiliary part 7312
  • the axial setting of the winding part 7310 so that the wire is wound in the comb teeth on the winding plate 7311 to form a high-voltage coil, that is, several coils of the high-voltage coil are distributed at intervals in the axial direction of the winding part 7310, and the force is balanced and the mechanical strength is good.
  • the width of the third card slot 73121 along the circumferential direction of the auxiliary part 7312 is defined as the slot width of the third card slot 73121, and the slot width of the third card slot 73121 matches the thickness of the winding plate 7311, so that the winding plate 7311 It is firmly assembled with the auxiliary part 7312, avoiding that when the width of the third slot 73121 is smaller than the thickness of the winding board 7311, it is difficult to align and fix the winding board 7311 on the auxiliary part 7312, or the slot width of the third slot 73121 is larger than When the thickness of the winding plate 7311 is reduced, the winding plate 7311 falls off from the auxiliary part 7312.
  • the winding board 7311 is fixedly connected in the third slot 73121 by an adhesive
  • the adhesive is a two-component high temperature resistant epoxy glue, of course it can also be other adhesives, but it needs to be ensured that the adhesive can
  • the winding board 7311 and the auxiliary part 7312 are firmly bonded, and the adhesive needs to be resistant to high temperature, so as to adapt to the high-voltage insulating layer and cover the winding board 7311 and the auxiliary part 7312 by high-temperature injection.
  • a slot may also be provided on the side of the winding board close to the auxiliary component, and the auxiliary component is clamped in the slot of the winding board, so that the winding board and the auxiliary component are fixedly connected.
  • the winding plate 7311 is a comb-toothed plate 7311, and the structure of the comb-toothed plate 7311 is similar to that of the winding plate 1313 in the previous embodiment, the difference is that both ends of the comb-toothed plate 7311 are provided with flow grooves 73111, to facilitate the injection molding process of the high-voltage insulating layer, the injected silicone rubber raw material can flow from the end of the winding part 7310 into the inside of the winding part 7310, so that the high-voltage insulating layer can fully fill the space between the winding part 7310 and the high-voltage coil The gap and the two ends of the winding part 7310.
  • Both the winding plate 7311 and the auxiliary part 7312 are made of glass fiber impregnated with epoxy resin, and laminated to a certain thickness after impregnated with multi-layer glass fiber cloth with epoxy resin, and molded and solidified to form a glass fiber reinforced plastic part.
  • the winding plate 7311 and the auxiliary part 7312 are separately molded and fixed by bonding.
  • the winding board and the auxiliary parts can also be integrally formed.
  • the high-voltage winding 830 includes a winding portion 8312 , a high-voltage coil 8320 and a high-voltage insulating layer 8330 .
  • the wire winding part 8312 is arranged circumferentially inside the high voltage winding 830 , and the wire is wound outside the wire winding part 8312 to form a high voltage coil 8320 .
  • the high-voltage insulating layer 8330 wraps the high-voltage coil 8320 and the winding part 8312 .
  • the high-voltage winding 830 only has the winding part 8312 as the winding body, and does not have a rigid insulating inner lining, that is, does not have a supporting cylinder.
  • the structure of the rigid insulating lining is omitted.
  • the heat conduction effect of the high-voltage winding 830 is better, and the interface between the high-voltage insulating layer 8330 and the rigid insulating lining is eliminated, thereby inhibiting the surface of the rigid insulating lining. Discharge; on the other hand, it also saves materials and reduces costs.
  • the winding part 8312 includes several comb-shaped winding plates 8313.
  • the winding plates 8313 are arranged at intervals and arranged at equal intervals on the inner side of the high-voltage winding 830.
  • Each winding plate 8313 is arranged along the axial direction of the high-voltage winding 830. set up.
  • the high-voltage coil 8320 includes several sections of coils, and at least one section of coils is arranged between two adjacent comb teeth on the winding board 8313 .
  • the number of winding boards 8313 is at least two.
  • the number of winding boards 8313 may be two, three, four or more, which is not limited here.
  • the winding plate 8313 is also provided with a number of winding slots 8314, so that the winding plate 8313 is comb-shaped, that is, the winding plate 8313 is formed with a number of comb teeth.
  • the specific structure, material, and molding method of the winding board 8313 are consistent with those of the above-mentioned winding board 1313, and will not be repeated here.
  • the high-voltage winding 930 is basically the same as the aforementioned high-voltage winding 830, except that the winding body 9310 includes a winding part 9312 and an auxiliary part 9316, and the winding part 9312 and Auxiliary piece 9316 is fixedly connected.
  • the wire winding part 9312 is several wire winding plates 9313.
  • the auxiliary part 9316 is annular and coaxial with the high voltage winding 930 , sleeved and fixed on several winding boards 9313 .
  • the setting aid 9316 can maintain the stable setting of the winding board 9313, avoiding the movement and dislocation of the winding board 9313 during the wire winding process and the injection process of the high-voltage insulating layer.
  • the auxiliary part 9316 includes at least one end auxiliary part 93161, and the end auxiliary part 93161 is arranged on the outside of the end of the winding board 9313, which can maintain the stable setting of the winding board 9313 without affecting the winding of the wire. make an impact.
  • a groove 9317 is provided outside the end of the winding board 9313 , and the auxiliary end part 93161 is inserted into the groove 9317 to ensure the effective connection between the auxiliary part 93161 and the winding board 9313 .
  • the groove 9317 is located on the comb side of the winding plate 9313, that is, on the side of the winding plate 9313 away from the axis of the high-voltage winding 930, so that the fixing effect of the end auxiliary part 93161 on the winding plate 9313 is better, avoiding The movement of the wire winding plate 9313 is misaligned during the wire winding process and the injection process of the high voltage insulating layer 9330 .
  • the groove depth of the groove 9317 is greater than or equal to the thickness of the end auxiliary part 93161, which is convenient for the silicone rubber material to cover the end of the winding board 9313 and the end auxiliary part 93161 during injection, and is not easily affected by external forces to cause the winding board
  • the connection of 9313 to end aid 93161 fails.
  • the end auxiliary part 9316 is fixedly connected in the groove 9317 by an adhesive.
  • the adhesive is a two-component high-temperature-resistant epoxy glue.
  • auxiliary part 9316 is firmly bonded to the winding board 9313 and is resistant to high temperature, so that the high-voltage insulating layer 9330 is coated on the outer circumference of the winding board 9313 and the auxiliary part 93161 by high temperature injection.
  • the end aids may also exactly match the dimensions of the grooves so that the end aids snap into the grooves without the need for adhesive fixation.
  • both ends of the winding board 9313 are provided with end auxiliary parts 93161, so that both ends of the winding board 9313 are fixed by the auxiliary parts 9316, which can effectively maintain the stable setting of the winding board 9313 .
  • an end auxiliary member may also be provided only outside one end of the winding board.
  • the auxiliary part 9316 also includes a central auxiliary part 93162.
  • the winding board 9313 is surrounded by a cavity, one side surface of the inner wall used to form the cavity is defined as the inner wall of the winding board 9313, and the middle auxiliary part
  • the piece 93162 is arranged on the inner wall of the winding plate 9313, which will not affect the winding of the wire on the comb side of the winding plate 9313.
  • the inner wall of the winding board 9313 is provided with a fourth slot 93131
  • the middle auxiliary part 93162 is fixed in the fourth slot 93131 , which ensures the effective connection between the middle auxiliary part 93162 and the winding board 9313 .
  • the groove depth of the fourth clamping groove 93131 matches the ring width of the middle auxiliary part 93162, so that after the middle auxiliary part 93162 and the winding board 9313 are assembled, the inner wall of the middle auxiliary part 93162 is flush with the inner wall of the winding board 9313 to avoid
  • the groove depth of the fourth clamping groove 93131 is smaller than the ring width of the middle auxiliary part 93162
  • the winding plate 9313 is bent around the middle auxiliary part 93162 during the wire winding process and the injection process of the high-voltage insulating layer 9330, or the second
  • the middle auxiliary part 93162 will not be fastened.
  • the auxiliary parts 9316 include two end auxiliary parts 93161 and one middle auxiliary part 93162, so that the winding plate 9313 can maintain a stable position during the wire winding process and the high-voltage insulating layer 9330 injection process, There will be no movement and dislocation, and avoid the two coils being too close, the insulation distance is not enough, and discharge will occur.
  • only the end auxiliary parts may be provided, or only the middle auxiliary parts may be provided, or a plurality of auxiliary parts may be arranged at intervals along the axial direction of the high voltage winding, as long as they can reinforce the winding plate.
  • the auxiliary part 9316 is also made of glass fiber impregnated with epoxy resin. After impregnated with multi-layer glass fiber cloth, epoxy resin is superimposed to a certain thickness, and molded and solidified to form a ring-shaped glass steel plate.
  • the auxiliary part 9316 can be in the shape of a circular ring, an elliptical ring, or other ring shapes.
  • the thickness of the end auxiliary part 93161 needs to be smaller than the tooth height at both ends of the winding plate 9313, and when the middle auxiliary part 93162 does not require its thickness, its ring width needs to be smaller than the width of the non-comb part of the winding plate 9313, that is, the winding plate 9313
  • its thickness needs to be less than the tooth height of the comb teeth in the middle of the winding plate 9313.
  • Such arrangement prevents the auxiliary part 9316 from occupying the winding groove 9314 and affecting the winding of the wire on the winding plate 9313 .
  • the auxiliary part 9316 and the winding board 9313 are formed separately and then bonded and fixed, or the auxiliary part 9316 and the winding board 9313 are integrally formed.
  • the wire is wound circumferentially on the outer peripheral surface of the winding board 9313 to form a high voltage coil 9320 (refer to FIG. 31 ).
  • the high-voltage winding 930 is then formed by vacuum-injecting the high-temperature vulcanized silicone rubber to cover the winding part 9312 , the high-voltage coil 9320 and the auxiliary parts 9316 .
  • the beneficial effects of the dry-type transformer according to the embodiment of the present application at least include: different from the prior art, the high-voltage winding of the dry-type transformer of the present application includes a winding body, a high-voltage coil and a high-voltage insulating layer of injection-molded silicone rubber, Compared with the epoxy resin high-voltage insulating layer in the prior art, it has the following advantages: 1) It has better fire resistance performance, low temperature resistance performance, aging resistance performance and short circuit test performance, which can effectively prolong the service life of dry-type transformers; 2) The copper coil is easy to peel off from the silicone rubber, and the material recyclability rate is greater than 99%, which is more environmentally friendly; 3) Silicone rubber elastomer can weaken the partial discharge inducement caused by mechanical vibration on the one hand, and has an inhibitory effect on equipment discharge.
  • silicone rubber under the action of discharge is non-conductive silicon dioxide, which can effectively inhibit the insulation from further deteriorating.
  • various components can be connected through silicone rubber elastomers for vibration reduction, which can greatly reduce vibration and noise; 4) It can reduce the operating loss of the transformer and save energy; 5) Silicone rubber has hydrophobicity and water-repellent mobility, and has good electrical corrosion resistance and flame retardant effect. It is also an H-level insulating material with good insulation performance, so it is resistant to harsh environments The ability is good and can be installed indoors and outdoors.
  • the silicone rubber of this application is injection molded through overall high-temperature vulcanization.
  • the silicone rubber filler for injection of the present application is evenly dispersed, and no partial discharge will be generated in the dry-type transformer due to the agglomeration of the filler, so that the overall performance of the dry-type transformer is better.
  • a method for preparing the high-voltage winding 130 is also provided, the method at least includes the following steps:
  • Step 1000 The wire is wound circumferentially along the outer peripheral surface of the winding body 1310 to form a high voltage coil 1320, and a tap is formed during the wire winding process.
  • winding body 1310 The specific structure, material, and forming method of the winding body 1310 are as described above, and will not be repeated here.
  • the winding body 1310 is sleeved on the winding equipment, and the wire is wound on the winding body 1310 so that the high-voltage coils 1320 are arranged at intervals along the axial direction of the support cylinder 1311 , thereby forming the pie-shaped high-voltage coils 1320 .
  • the wire winding method and the structure of the high-voltage coil 1320 are the same as those described above, and will not be repeated here.
  • the tap 2, tap 3, tap 4, tap 5, tap 6 and tap 7 are led out respectively, thereby forming a tap switch.
  • the wires can also be wound into double-winding continuous high-voltage coils 2320, multi-segment cylindrical high-voltage coils 3320, and segmented cylindrical high-voltage coils 4320 as shown in Figures 14-16, or only lead out The details of the four taps are as mentioned above, and will not be repeated here.
  • Step 1100 place the tap in the protective cavity of the tool connector 101 and connect and fix it with the tool connector 101 .
  • the six taps are respectively connected and fixed to the protection cavity of the tooling connector 101 .
  • the protection cavity is six stepped holes 1011, which can be connected by welding or fixedly connected by other methods, which is not limited here.
  • Step 1200 Put the winding body 1310 wound with the high-voltage coil 1320 as the body to be injected into the mold of the injection machine, and inject high-temperature vulcanized silicone rubber around the body to be injected, so that the high-voltage vulcanized silicone rubber covers the high-voltage coil 1320 and the winding body.
  • step 1200 bolts are connected in the six stepped holes 1011 of the tooling connector 101, so that the bolts can directly fill the remaining space of the stepped holes 1011, preventing the silicone rubber from filling the six stepped holes 1011, thereby avoiding six taps It cannot be used for wiring after being covered with silicone rubber.
  • winding body 1310 and the high-voltage coil 1320 connected with the tooling connector 101 as the body to be injected, and then after coating the outer periphery of the body to be injected with a coupling agent, put the body to be injected into the mold of the injection machine, and add silicone rubber
  • the raw material is to inject high-temperature vulcanized silicone rubber into the outer periphery of the body to be injected, and obtain the high-voltage winding 130 after cooling.
  • the high-voltage insulating layer 1330 of high-temperature vulcanized silicone rubber improves the insulation and mechanical properties of the high-voltage winding 130 as a whole.
  • the high-temperature vulcanized silicone rubber covers the high-voltage coil 1320 and the winding body 1310 through integral vacuum injection, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the winding body 1310 and the two ends of the winding body 1310, and the high-temperature vulcanized silicon rubber
  • the rubber does not cover the inner wall of the support cylinder 1311, so that the high voltage winding 130 has a hollow cylindrical shape as a whole, which can be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylinders.
  • the high-voltage coil 1320 and the winding body 1310 may also be coated with other injection-molded silicone rubber such as liquid silicone rubber for injection.
  • Step 1300 Remove the tooling connector 101 to obtain the high voltage winding 130 with taps exposed to high temperature vulcanized silicone rubber.
  • the high-voltage insulating layer 1330 is formed by vacuum injection, a small amount of silicone rubber is coated on the side of the tooling connector 101. Since the silicone rubber coated on the tooling connector 101 is relatively small, the tooling connector 101 can be removed directly by tools to expose The taps finally form the high voltage winding 130 as shown in FIG. 10 .
  • the embodiment of the present application also provides a method for preparing a high voltage winding 930, the method at least includes the following steps:
  • Step 2000 Paste a high temperature resistant film (not shown in the figure) on the outer peripheral surface of the winding tool 90 .
  • the winding tool 90 includes a mold 91 and a connecting rod 92, the connecting rod 92 passes through the mold 91 along the axial direction of the mold 91, and the connecting rod 92 is used to connect the winding tool 90 with the winding machine for wire winding system.
  • the mold 91 is a hollow shell, which can be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylinders.
  • the outer peripheral surface of the mold 91 can match the inner peripheral surface of the high voltage winding 930 .
  • the hollow mold 91 is lighter in weight, which can ensure that the winding tooling 90 is within the carrying range of the winding machine.
  • the mold 91 can be made of hard metal such as iron, and reinforcing ribs can be welded inside the mold 91 to improve the mechanical strength of the mold 91.
  • the high temperature resistant film is fixed on the outer peripheral surface of the mold 91 with a high temperature resistant polyimide tape or other high temperature resistant tape, which can make the high voltage winding 930 easy to demould after injection of high temperature vulcanized silicone rubber.
  • a coupling agent is coated on the wires.
  • a mold release agent is generally coated outside the mold. The coupling agent and the release agent will react chemically at high temperature, which will affect the performance of the high voltage winding 930. In order to avoid this situation and make it easy to release the mold, this application replaces the release agent with a high temperature resistant film.
  • the high-temperature-resistant film is a film that can withstand high temperatures of at least 105°C. Since the injection machine injects, the general temperature is 105°C and above, and the high-temperature-resistant film must be guaranteed not to be damaged at the highest injection temperature. That's it.
  • it can be FEP film.
  • FEP film is a high temperature resistant isolation film, which has high and low temperature resistance from -200 ° C to 200 ° C, low friction, non-stick and lubricity, chemical resistance, thermal stability and electrical insulation. It will not be destroyed even at the highest injection temperature.
  • high-temperature-resistant films such as polyimide films can also be used, as long as they are not damaged at the highest injection temperature. Evidently, higher temperature resistant films may also be suitable.
  • the high-voltage winding 930 does not include a rigid insulating inner lining, the shape of its inner peripheral surface matches the shape of the outer peripheral surface of the mold 91. By changing the size and shape of the mold 91 for winding the tooling 90, different inner diameters and inner diameters can be produced. High-voltage winding 930 in the shape of a peripheral surface.
  • Step 2100 Fix the wire winding part 9312 on the high temperature resistant film, and add an auxiliary part 9316 so that the auxiliary part 9316 is stably fixed on the wire winding part 9312.
  • the auxiliary part 9316 includes a middle auxiliary part 93162, and the middle auxiliary part 93162 is firstly set on the high temperature resistant film on the winding tool 90.
  • the middle auxiliary part 93162 is sleeved on the outer peripheral surface of the mold 91.
  • the middle auxiliary part 93162 is sleeved on the middle part of the mold 91 first, and then the position of the fourth slot 93131 on the winding plate 9313 can be followed. Make adjustments so that the middle auxiliary part 93162 is engaged in the fourth locking groove 93131 .
  • the winding part 9312 is arranged along the circumferential direction of the winding tool 90 so that the inner wall of the middle auxiliary part 93162 is flush with the inner wall of the winding part 9312 .
  • the wire winding part 9312 is bonded on the high temperature resistant film along the circumferential direction of the winding tool 90 by an adhesive, and a number of wire winding slots 9314 are provided on the wire winding part 9312 for subsequent wire winding.
  • winding part 9312 is a plurality of comb-shaped winding plates 9313
  • several winding plates 9313 are arranged at intervals and evenly distributed in the circumferential direction on the winding tool 90, and each winding plate 9313 is along the Axial setting of winding tooling 90 .
  • a number of winding slots 9314 are set on the winding plate 9313, so that the winding plate 9313 is comb-shaped, and the winding slots 9314 are used for subsequent winding of wires, and the inner wall of the winding plate 9313 is bonded to the high temperature resistant film by an adhesive
  • the inner wall of the winding board 9313 is provided with a fourth locking groove 93131, and the middle auxiliary part 93162 is engaged in the fourth locking groove 93131.
  • the winding plate 9313 engages with the middle auxiliary part 93162 through the fourth clamping slot 93131, and the middle auxiliary part 93162 and the winding plate 9313 are also bonded by an adhesive.
  • the auxiliary part 9316 includes an end auxiliary part 93161.
  • the winding part 9312 is arranged along the circumference of the winding tool 90, and then the end auxiliary part 93161 is fixed on the winding part 9312. Outside the end, the end auxiliary part 93161 is coaxial with the winding tooling 90 .
  • the end auxiliary part 93161 is bonded and fixed on the outside of the end of the winding part 9312 through an adhesive, which can not only keep the stable setting of the winding part 9312, but also prevent the winding of the wire from occurring. Influence.
  • the above-mentioned adhesives are two-component high-temperature-resistant epoxy adhesives. Of course, other adhesives can also be used, but it is necessary to ensure that the adhesive can make the middle auxiliary part 93162, the end auxiliary part 93161 and the winding part 9312 bonded.
  • the connection is reliable and high temperature resistant, so as to adapt to the high-voltage insulation layer 9330.
  • the outer circumference of the winding part 9312 and the auxiliary part 9316 is covered by high-temperature injection.
  • the auxiliary piece 9316 includes two end auxiliary pieces 93161 .
  • the two end auxiliary parts 93161 are bonded on the outer sides of the two ends of the winding part 9312 respectively, and the end auxiliary parts 93161 are coaxial with the winding tool 90 .
  • the auxiliary part 9316 includes a central auxiliary part 93162 and two end auxiliary parts 93161. 9313 is fixed on the outer surface of the winding tooling 90 and the middle auxiliary part 93162 is engaged in the fourth slot 93131, and then the two end auxiliary parts 93161 are respectively bonded to the outer sides of the two ends of the winding part 9312, Such that the end aid 93161 fits into the groove 9317.
  • the middle auxiliary part, the end auxiliary part and the winding part may also be bonded and fixed first, and then sleeved and fixed on the winding tool.
  • Step 2200 Wind a wire on the winding part 9312 to form a high voltage coil 9320 with a tap switch.
  • Fig. 31 shows the winding manner of the wire, and the wire includes a first wire and a second wire.
  • the wire winding method of this embodiment is the same as that of the embodiment shown in FIG. 9 , and will not be repeated here.
  • Step 2300 Referring to FIG. 32, put the winding part 9312 wound with the high-voltage coil 9320 as the body to be injected together with the winding tooling 90 into the injection machine, and inject high-temperature vulcanized silicone rubber into the periphery of the body to be injected to form a high-voltage insulating layer 9330. A high voltage winding 930 is obtained.
  • Step 2400 Demoulding the high voltage winding 930 from the winding tool 90 .
  • the winding tool 90 is separated from the high-voltage winding 930 to remove the mold, and the demoulding method adopts a common method in the industry, and will not be repeated here.
  • step 2400 after step 2400, it also includes:
  • Step 2500 Trim the remaining burrs of the high temperature resistant film on the inner surface of the high voltage winding 930 to prevent the burrs from generating partial discharge.
  • step 2500 if there is no burr of the high temperature resistant film remaining on the inner surface of the high voltage winding, then step 2500 does not need to be implemented.
  • the remaining high temperature resistant film may be removed by tearing to keep the inner wall of the high voltage winding clean and smooth.
  • the preparation method of the high-voltage winding 930 of the present application has simple steps, and the required winding tooling 90 has a simple structure and is easy to manufacture, and the high-voltage winding 930 prepared by this method does not need a rigid insulating inner lining, so that the high-voltage winding 930
  • the heat conduction effect is better, there is no interface between the high-voltage insulating layer 9330 and the rigid insulating inner lining, so there is no discharge on the surface of the rigid insulating inner lining, saving materials and reducing costs.

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Abstract

本申请涉及一种高压绕组(130)，包括绕线体(1310)、高压线圈(1320)和高压绝缘层(1330)，导线绕制在所述绕线体(1310)上形成所述高压线圈(1320)，所述高压绝缘层(1330)包裹所述高压线圈(1320)和所述绕线体(1310)。本申请还涉及一种制备高压绕组的方法。

Description

高压绕组及制备高压绕组的方法
相关申请的交叉引用
本申请要求于2021年12月29日申请的，申请号为2021116478032、名称为“一种高压绕组及干式变压器”的中国专利申请，于2021年12月29日申请的，申请号为2021116441856、名称为“一种高压绕组的绕线体及高压绕组”的中国专利申请，于2021年12月29日申请的，申请号为2021116478051、名称为“一种高压绕组制备方法及高压绕组”的中国专利申请，以及于2021年12月29日申请的，申请号为2021116442577、名称为“一种高压绕组的制备方法”的中国专利申请的优先权，在此将它们全文引入作为参考。
技术领域
本申请涉及电力变压器技术领域，特别是涉及一种高压绕组以及制备该高压绕组的方法。
背景技术
目前变压器可分为：油浸式变压器、干式变压器、气体变压器。干式变压器具有无油、防火、寿命长、节能低噪、维护简单、安全可靠等优点。当前市场上干式变压器大多数为树脂浇注高压绕组的干式变压器和敞开干式变压器。虽然干式变压器在近10年来有了很大的发展，但在运行中仍存在绝缘开裂、导热差、运行环境严苛等问题。
在制备高压绕组的传统方法中，一般采用在工装上绕制导线形成高压线圈，而后浇注形成高压绕组，导致高压线圈散热能力差、抗短路冲击能力也差。
发明内容
针对现有技术的不足，本申请的目的在于提供一种高压绕组以及制备该高压绕组的方法，该高压绕组的线圈可回收，能耗低，节能环保；绝缘层稳固，机械性能好，使用寿命长。
根据本申请的一个方面，提供了一种高压绕组，包括：绕线体、高压线圈和高压绝缘层，导线绕制在所述绕线体上形成所述高压线圈，所述高压绝缘层包裹所述高压线圈和所述绕线体。
在一个实施例中，所述绕线体采用纤维增强复合材料制成。
在一个实施例中，所述高压绝缘层为注射成型硅橡胶。
在一个实施例中，所述绕线体包括绕线部，所述高压线圈包括若干段线圈，若干段所述线圈绕制在所述绕线部上且沿所述高压绕组的轴向间隔设置。
在一个实施例中，所述导线包括第一导线和第二导线，所述第一导线从所述绕线部的第一端沿所述高压绕组的轴向绕制至所述绕线部的中部，所述第二导线从所述绕线部的所述中部沿所述高压绕组的轴向绕制至所述绕线部的第二端。
在一个实施例中，所述第一导线位于所述绕线部的所述第一端的内匝导线端形成暴露于所述高压绝缘层外的第一外接，所述第二导线位于所述绕线部的所述第二端的外匝导线端形成暴露于所述高压绝缘层外的第二外接。
在一个实施例中，所述绕线部包括若干绕线板，所述绕线板上设有若干梳齿，若干所述绕线板沿所述高压绕组的周向设置，所述绕线板上的相邻两个所述梳齿间至少设置一段所述线圈。
在一个实施例中，将所述梳齿沿所述高压绕组的轴向的高度定义为齿高，所述绕线板中部的所述梳齿的齿高和所述绕线板两端的所述梳齿的齿高均大于所述绕线板其他部分的所述梳齿的齿高，使所述绕线板在所述高压绕组的轴向上自一端朝向另一端，依次形成第一高梳齿区、第一低梳齿区、第二高梳齿区、第二低梳齿区、第三高梳齿区。
在一个实施例中，每段所述线圈沿所述高压绕组的轴向层式往复绕制。
在一个实施例中，所述线圈沿所述高压绕组的轴向设有至少一个层间绝缘层。
在一个实施例中，所述层间绝缘层为边缘呈波浪形的绝缘长条。
在一个实施例中，所述高压线圈在其各径向截面上的宽度一致。
在一个实施例中，所述注射成型硅橡胶通过整体真空注射包覆所述高压线圈和所述绕线体，所述注射成型硅橡胶填充所述高压线圈和所述绕线体之间的缝隙以及所述绕线体的两端。
在一个实施例中，所述绕线体还包括：支撑筒，所述绕线部设置在所述支撑筒外周面上，所述支撑筒为空心柱体。
根据本申请的另一方面，提供了一种制备高压绕组的方法，所述高压绕组是前述任一实施例中所述的高压绕组，所述方法包括如下步骤：
步骤1000：所述导线沿所述绕线体的外周面进行周向绕制形成所述高压线圈，所述导线绕制过程中形成分接头；
步骤1100：将所述分接头置于工装连接件的保护腔且与所述工装连接件连接固定；
步骤1200：将绕制有所述高压线圈的所述绕线体作为待注射体放入注射机的模具中，在所述待注射体外周注射注射成型硅橡胶，使得所述注射成型硅橡胶包覆所述高压线圈和所述绕线体；
步骤1300：移除所述工装连接件，得到所述分接头暴露于所述注射成型硅橡胶外的所述高压绕组。
在一个实施例中，所述绕线体包括支撑筒和位于所述支撑筒外周面上的绕线部，在所述步骤1000中，将所述导线绕制在所述绕线部上形成所述高压线圈。
在一个实施例中，在所述步骤1100中，所述保护腔为台阶孔，将所述分接头焊接在所述台阶孔中。
在一个实施例中，所述台阶孔的内壁设有螺纹，在所述步骤1200前，在所述台阶孔内连接螺栓。
在一个实施例中，在所述步骤1000前，采用玻璃纤维浸渍环氧树脂制成所述支撑筒和所述绕线部。
在一个实施例中，在所述步骤1000前，将若干所述绕线板周向均布粘接固定在所述支撑筒的外周面上。
在一个实施例中，在所述步骤1000前，在所述绕线板上开设若干绕线槽，使所述绕线板形成若干梳齿。
在一个实施例中，在所述步骤1200中，所述注射成型硅橡胶通过整体真空注射包覆所述高压线圈和所述绕线体并填充所述高压线圈和所述绕线体之间的缝隙以及所述绕线体的两端。
根据本申请的另一方面，提供了一种制备高压绕组的方法，所述高压绕组是前述任一实施例中所述的高压绕组，所述绕线体包括辅助件和绕线部，所述绕线部与所述辅助件固定连接，所述高压绝缘层包裹所述高压线圈、所述绕线部和所述辅助件，其特征在于，所述方法包括如下步骤：
步骤2000：在绕制工装的外周面贴耐高温膜；
步骤2100：将所述绕线体固定在所述耐高温膜上，且使所述辅助件稳定卡固所述绕线部；
步骤2200：在所述绕线部上绕制所述导线形成具有分接开关的所述高压线圈；
步骤2300：将绕制有所述高压线圈的所述绕线体作为待注射体连同所述绕制工装放入注射机，在所述待注射体外周整体注射注射成型硅橡胶形成所述高压绝缘层，得到所述高压绕组；
步骤2400：将所述高压绕组从所述绕制工装上脱模。
在一个实施例中，所述绕制工装包括模具和连接杆，所述连接杆沿所述模具的轴向穿设所述模具，在所述步骤2000中，将所述耐高温膜用耐高温胶带固定在所述模具的外周面。
在一个实施例中，所述辅助件包括中部辅助件，在所述步骤2100中，先将所述中部辅助件套设于所述耐高温膜上，再将所述绕线部沿所述绕制工装的周向设置并使得所述中部辅助件的内壁与所述绕线部的内壁平齐。
在一个实施例中，所述绕线部的内壁设置有凹槽，在所述步骤2100中，将所述中部辅助件卡合在所述凹槽中，使所述中部辅助件与所述绕线部固定连接。
在一个实施例中，所述辅助件包括端部辅助件，在所述步骤2100中，先将所述绕线部沿所述绕制工装的周向设置，再将所述端部辅助件固定在所述绕线部的端部外侧。
在一个实施例中，所述绕线部的端部外侧设置有卡槽，在所述步骤2100中，将所述端部辅助件嵌入所述卡槽中。
在一个实施例中，所述绕线部包括若干梳齿状的绕线板，在所述步骤2100中，将若干所述绕线板间隔 设置并周向均布在所述绕制工装的外周面。
在一个实施例中，在所述步骤2400之后还包括：
步骤2500：修剪所述高压绕组内表面残留的所述耐高温膜的毛边。
在一个实施例中，在所述步骤2100中，将所述绕线部或所述辅助件粘接在所述耐高温膜上。
附图说明
通过附图中所示的本发明的优选实施例的更具体说明，本发明的上述及其它目的、特征和优势将变得更加清晰。在全部附图中相同的附图标记指示相同的部分，且并未刻意按实际尺寸等比例缩放绘制附图，重点在于示出本发明的主旨。
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述，本发明的其它特征、目的和优点将会变得更明显：
图1是本申请一实施例的干式变压器的主视图；
图2是本申请一实施例的干式变压器的俯视图；
图3是本申请一实施例的装配后的铁芯的主视图；
图4是图2中G处的放大图；
图5是本申请一实施例的铁芯夹件的主视图；
图6是本申请一实施例的铁芯夹件的侧视图；
图7是本申请一实施例的绕线体的立体示意图；
图8是本申请一实施例的支撑筒的剖面图；
图9是本申请一实施例的高压线圈绕制在绕线体上的立体示意图；
图10是本申请一实施例的高压绕组的立体示意图；
图11是本申请一实施例的工装连接件的立体示意图；
图12是本申请一实施例的高压线圈的线路简图；
图13是本申请一实施例的高压绕组的局部截面图；
图14是本申请一实施例的高压绕组的局部截面图；
图15是本申请一实施例的高压绕组的局部截面图；
图16是本申请一实施例的高压绕组的局部截面图；
图17是本申请一实施例的绕线体的立体示意图；
图18是图17中H处的放大图；
图19是本申请一实施例的支撑筒的立体示意图；
图20是图19中J处的放大图；
图21是本申请一实施例的绕线部的立体示意图；
图22是本申请一实施例的辅助件的立体示意图；
图23是本申请一实施例的高压绕组的立体示意图；
图24是本申请一实施例的高压线圈绕制在绕线部上的立体示意图；
图25是本申请一实施例的绕线部与辅助件连接的立体示意图；
图26是图25中绕线部与端部辅助件固定部位的放大示意图；
图27是图25中绕线部与中部辅助件固定部位的放大示意图；
图28是本申请一实施例的高压绕组的立体示意图；
图29是本申请一实施例的绕制工装的立体示意图；
图30是本申请一实施例的辅助件和绕线板装配在绕制工装上的立体示意图；
图31是本申请一实施例的高压线圈绕制于绕线工装上的立体示意图；
图32是本申请一实施例的注射工艺的示意图。
具体实施方式
根据要求，这里将披露本申请的具体实施例。然而，应当理解的是，这里所披露的实施例仅仅是本申请的典型例子而已，其可体现为各种形式。因此，这里披露的具体细节不被认为是限制性的，而仅仅是作为权利要求的基础以及作为用于教导本领域技术人员以实际中任何恰当的方式不同地应用本申请的代表性的基础，包括采用这里所披露的各种特征并结合这里可能没有明确披露的特征。
本申请中所述的“连接”，除非另有明确的规定或限定，应作广义理解，可以是直接相连，也可以是通过中间媒介相连。在本申请的描述中，需要理解的是，“上”、“下”、“端部”、“一端”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
如图1-图3所示，在根据本申请的一个实施例中，干式变压器10为三相变压器，包括A相、B相和C相。即，干式变压器10包括三个单相变压器100。根据铁芯110的结构不同，三个变压器100可以排列形成直线结构或者三角结构，且三个变压器100呈对称结构。此外，该干式变压器10也可以为隔离变压器、变频变压器、试验变压器等。
继续参阅图1-图3，在根据本申请的一个实施例中，三个变压器100排列形成直线结构，干式变压器10包括铁芯110、三个低压绕组120和三个高压绕组130。铁芯110、低压绕组120、高压绕组130从内到外依次设置。具体地，铁芯110包括三个柱状铁芯体111、位于三个柱状铁芯体111上端的上铁轭112和位于三个柱状铁芯体111下端的下铁轭113。每个柱状铁芯体111的外周套设有一个低压绕组120，每个低压绕组120的外周套设有一个高压绕组130。即，每个柱状铁芯体111上，从内向外依次套设有一个低压绕组120和一个高压绕组130。铁芯110、低压绕组120、高压绕组130同轴设置，即三者具有相同的轴向。柱状铁芯体111通过在叠加的多层硅钢片外用扎带进行绑扎固定而形成。可选地，柱状铁芯体111的径向截面呈大致的椭圆形或者圆形或者其他形状。柱状铁芯体111的径向截面可以根据实际需要选择合适的形状，只要柱状铁芯体111能被容纳在低压绕组120的空心腔中即可，本申请对此不作限制。类似的，上铁轭112和下铁轭113也是由叠加的多层硅钢片形成。三个柱状铁芯体111通过上铁轭112和下铁轭113固定连接，以形成铁芯110。
结合图1、图2、图5和图6，铁芯110的外侧设置有铁芯夹件140，铁芯夹件140用于夹持铁芯110。铁芯夹件140由三个夹件相互连接形成，三个夹件均为板件，将位于中间位置的夹件定义为第一夹件142，其余的两个夹件定义为第二夹件143。两个第二夹件143在第一夹件142与两个第二夹件143连接的两侧同向延伸，使铁芯夹件140呈类似于槽钢的结构，即，铁芯夹件140呈“匚”字型结构。在其他实施例中，铁芯夹件也可以为封闭的空心管件，结构更稳定。
在根据本申请的一个实施例中，铁芯夹件140设置为四个，其中两个铁芯夹件140对称地设置在铁芯110上端的两侧，并且通过第一紧固件固定连接，以夹紧铁芯110的上端(即上铁轭112)。另外两个铁芯夹件140对称地设置在铁芯110下端的两侧，并且通过第二紧固件固定连接，以夹紧铁芯110的下端(即下铁轭113)。优选地，第一紧固件、第二紧固件均采用相互配合使用的若干螺杆及螺栓，以分别通过两个铁芯夹件140夹紧铁芯110的两端。铁芯夹件140的两端均开设有第一通孔141。具体地，第一夹件142的两端各设置有一个第一通孔141。将两个铁芯夹件140对应放置在铁芯110上端的两侧，并在两个铁芯夹件140同一端的两个第一通孔141内同时穿设螺杆(图未示)后用螺栓拧紧固定，两个铁芯夹件140的两端均如此固定，使两个铁芯夹件140夹紧铁芯110的上端。铁芯110下端的两个铁芯夹件140也采用同样方式固定并夹紧铁芯110的下端，具体不再赘述。可选地，为进一步可靠夹紧铁芯110，铁芯夹件140的中间部位也可以采用相互配合使用的若干螺杆和螺栓以夹紧铁芯110的中部。第二夹件143上还设有第二通孔(图中未示出)，用于与低压绕组120连接。
在本实施例中，上端的两个铁芯夹件140位于设置在铁芯110外周的高压绕组130的上方。高压绕组130的顶部设有若干绝缘垫块1001用于支撑上端的两个铁芯夹件140，以及使低压绕组120和高压绕组130分别与上铁轭112保持安全的电气距离。同样地，下端的两个铁芯夹件140位于设置在铁芯110外周的高压绕组130的下方。下端的两个铁芯夹件140的顶部也设有若干绝缘垫块1001用于支撑低压绕组120和高 压绕组130，以及使低压绕组120和高压绕组130分别与下铁轭113之间保持安全的电气距离。可选地，绝缘垫块1001由绝缘材料制成，例如由团状模塑料(DMC：Dough Molding Compound)、片状模塑料(SMC：Sheet Molding Compound)等低收缩不饱和聚酯玻璃纤维增强模塑料制成，或者例如由环氧树脂浇注成型。铁芯夹件140由纤维增强复合材料制成。具体地，铁芯夹件140可由玻璃纤维浸渍环氧树脂模压成型，或者由芳纶纤维浸渍环氧树脂模压成型。可选地，铁芯夹件140也可以采用其他复合材料制成。可选地，第一夹件142和第二夹件143一体成型。
纤维增强复合材料指由增强纤维材料，如玻璃纤维、芳纶纤维等，与基体材料经过缠绕、模压或拉挤等成型工艺而形成的复合材料。纤维增强复合材料制成的铁芯夹件140成本低、重量轻、机械性能好，且纤维增强复合材料生产过程排碳量低，更绿色、更环保。
结合图2和图4所示，低压绕组120包括铜箔121、低压绝缘层122和支撑条123，铜箔121和低压绝缘层122交替设置。铜箔121通过整张铜箔纸卷绕成型，低压绝缘层122与铜箔121重叠设置后共同卷绕。低压绕组120中设有至少一条散热气道，该散热气道位于相邻的铜箔121和低压绝缘层122之间。支撑条123位于该散热气道内，用于支撑隔离相邻的铜箔121和低压绝缘层122。每层散热气道内设置至少两个支撑条123。可选地，可以设置两个、三个、四个或者更多个支撑条123。优选地，同一层的多个支撑条123沿铜箔121外周面的周向以等间距间隔设置。散热气道旨在有利于释放在干式变压器10的运行过程中低压绕组120产生的热量，避免干式变压器10因热量堆积导致过热失效。可选地，散热气道可以设置一层，也可以设置两层或更多层，在此不作限制。
低压绝缘层122采用聚酰亚胺浸渍纸，具体可以为SHS-P二苯醚预浸材料，选用聚酰亚胺薄膜与聚砜纤维非织布柔软复合材料浸渍二苯醚树脂后烘烤而成，当然低压绝缘层也可以采用DMD绝缘纸或硅橡胶薄膜，或者其他绝缘材料，根据干式变压器不同的温升等级选取即可。
可选地，支撑条123由玻璃纤维浸渍环氧树脂制成，或者由芳纶纤维浸渍环氧树脂制成。可选地，支撑条123为截面呈工字型的长条，机械强度更稳定。可选地，支撑条也可以为截面呈方形或者其他形状的长条，只要能够起到支撑隔离的作用即可。
低压绕组120的内圈层还设有内引线铜排，低压绕组120的外圈层还设有外引线铜排，内引线铜排和外引线铜排的自由端上设置连接孔，该连接孔与铁芯夹件140上的第二通孔对应匹配后紧固连接。
如图7-图12所示，高压绕组130包括绕线体1310、高压线圈1320和高压绝缘层1330，导线绕制在绕线体1310上形成高压线圈1320。绕线体1310包括支撑筒1311和绕线部1312。支撑筒1311为空心柱体，可以是空心圆柱体，也可以是空心椭圆柱体，或者是其他空心柱状体。绕线部1312设置在支撑筒1311的外周面上，导线绕制在绕线部1312中形成高压线圈1320。高压线圈1320包括若干段线圈，若干段线圈沿支撑筒1311的轴向间隔布置。绕线体1310的轴向与高压绕组130的轴向为同一方向。
绕线部1312包括若干绕线板1313，若干绕线板1313在支撑筒1311的周向上以等间距布置在支撑筒1311的外周面上。每个绕线板1313沿支撑筒1311轴向延伸，绕线板1313沿支撑筒1311的轴向延伸长度小于支撑筒1311沿其轴向的延伸长度。绕线板1313的数量至少为两个。可选地，绕线板1313的数量可以为两个、三个、四个或者更多，在此不作限制。优选地，干式变压器(例如，10kV/1000kVA干式变压器)的绕线板1313的数量设置为十二个，以保证导线的绕制牢靠，且尽量节约材料。在其他实施例中，绕线板沿支撑筒的轴向延伸长度也可以等于支撑筒沿其轴向的延伸长度。
绕线板1313为矩形板件，绕线板1313较长的侧边沿支撑筒1311的轴向设置，即绕线板1313的长度方向沿支撑筒1311的轴向设置，绕线板1313上还设有若干绕线槽1314，若干绕线槽1314沿支撑筒1311的径向延伸且沿支撑筒1311的轴向间隔分布，使绕线板1313呈梳齿状，也即绕线板1313上形成有若干梳齿。将绕线板1313上的梳齿沿支撑筒1311轴向的高度定义为齿高，优选地，绕线板1313两端的梳齿的齿高及绕线板1313中部的梳齿的齿高均大于其他部分的梳齿的齿高。这是由于高压线圈1320的端部场强不均，将绕线板1313两端的齿高设置的更大可均匀电场，而绕线板1313中部需要引出分接线的分接头，将绕线板1313中部的齿高设置的更大，则对应的相邻两个绕线槽1314之间的距离也更大，可以为从绕线板1313中部引出的分接头留出放置空间。将齿高稍大的梳齿区域定义为高梳齿区，将齿高稍小的梳齿区域定 义为低梳齿区。通过上述设置，使得绕线板1313在沿支撑筒1311的轴向上自一端朝向另一端，依次形成第一高梳齿区、第一低梳齿区、第二高梳齿区、第二低梳齿区、第三高梳齿区。进一步地，第一高梳齿区、第二高梳齿区和第三高梳齿区的齿高具体不限制，例如可以彼此相同，也可以各不同。可选地，第一高梳齿区、第三高梳齿区可以关于第二高梳齿区对称设置，第一低梳齿区、第二低梳齿区也可以关于第二高梳齿区对称设置，使高压线圈1320在高压绕组130的轴向上对称设置，此时高压绕组130的重心位于高压绕组130的中心位置，便于高压绕组130的吊装、运输。可选地，第一高梳齿区、第一低梳齿区、第二高梳齿区、第二低梳齿区、第三高梳齿区可以不对称设置，在此不作限制。可选地，各区域的梳齿的齿高也可以采用等高或者其他的设置方式，在此不作限制。
绕线板1313上的相邻两个梳齿间至少设置一段线圈，使得每个绕线槽1314中均缠绕有导线，合理分布设置高压线圈1320，且各段线圈实现间隔设置。
绕线板1313在支撑筒1311的周向上以等间距布置在支撑筒1311的外周面上，每一个绕线板1313的两端平齐设置，并且每一个绕线板1313上的绕线槽1314在支撑筒1311的周向上一一对应匹配，每段线圈由导线沿支撑筒1311周向绕制在所有绕线板1313上对应的一圈绕线槽1314中，受力均衡，机械强度好。
在其他实施例中，为了避让分接头的设置位置，若干绕线板也可以非等间距地设置在支撑筒的外周面，即相邻两个绕线板之间的距离彼此不相等，比如某相邻两个绕线板之间的距离大于其他任意相邻两个绕线板之间的距离。此时各个分接头可以从间距较大的相邻两个绕线板之间引出，如此绕线板中部的梳齿的齿高无需设置更大，也能够留出各个分接头的设置位置。
在其他实施例中，绕线板也可以是环绕支撑筒周向设置的环形盘件。若干绕线板沿支撑筒的轴向间隔设置，导线绕制在相邻的两个绕线板形成的凹槽中。
可选地，支撑筒1311为玻璃纤维浸渍环氧树脂缠绕固化成型或者拉挤成型的空心管，也可以是玻璃纤维或者芳纶纤维浸渍环氧树脂拉挤缠绕成型的空心管，还可以是芳纶纤维浸渍环氧树脂缠绕固化成型或者拉挤成型的空心管，或者采用其他复合材料制成，在此不作限制。
在根据本申请的一个实施例中，支撑筒1311与绕线板1313为各自独立成型的两个部件，二者粘接固定。绕线板1313也由玻璃纤维浸渍环氧树脂制成，通过多层玻璃纤维布浸渍环氧树脂后叠加成一定厚度，并模压固化形成矩形玻璃钢板件，在玻璃钢板件上开设绕线槽1314，具体可车削形成绕线槽1314，从而形成绕线板1313，绕线板1313通过粘接剂固定连接在支撑筒1311的外周面上，由此，最大限度地节省制造原料并节约成本。可选地，粘接剂为双组分耐高温的环氧胶，当然也可以是其他粘接胶，但是需保证该粘接胶能够使支撑筒1311与绕线板1313粘接牢靠，且耐高温，以适应在绕线体1310外高温注射高压绝缘层1330。
在本实施例中，绕线板1313经过模压、固化成型。在其他实施例中，绕线板也可以经过整体浇注、固化直接成型梳齿状的绕线板，简化工艺，且绕线板的材质与前述一致，不再赘述。
在根据本申请的另一个实施例中，支撑筒1311与绕线板1313一体成型。通过玻璃纤维或者芳纶纤维浸渍环氧树脂拉挤或缠绕成一个厚度较大的空心管，然后对该空心管进行车削，从而形成支撑筒1311和绕线板1313，此方式材料用量相对较高，但是能够保证支撑筒1311与绕线板1313之间的强度，防止由于粘接不牢靠或者在后续注射高压绝缘层1330的过程中损坏支撑筒1311与绕线板1313之间的连接。
在根据本申请的又一个实施例中，结合图7和图8所示，绕线体1310还包括两个翻边1315，两个翻边1315分别设置在支撑筒1311的两个端部，且沿支撑筒1311的径向向外延伸形成环状盘面。两端的翻边1315相对设置，当绕线板1313置于绕线体1310的外周面时，绕线板1313两个端部的外端面抵接两个翻边1315彼此相对的盘面，防止在注射高压绝缘层1330的过程中由于较大的注射压力将绕线板1313损坏。当然，绕线板1313两个端部的外端面也可以不抵接两个翻边1315彼此相对的盘面，即绕线板1313两个端部的外端面与翻边1315朝向绕线板1313的盘面之间留有空隙，在此不作限制。翻边1315由玻璃纤维浸渍环氧树脂制成，与支撑筒1311一体成型，即通过玻璃纤维或者芳纶纤维浸渍环氧树脂拉挤或缠绕成型，然后加工打磨成带有一定厚度的圆盘件。
绕线体1310采用上述的纤维增强复合材料制成，具有轻质高强的特性，使绕线体1310具有较好的机 械强度，能够有效支撑导线的绕制，不易损坏，避免高温硫化硅橡胶在绕线体1310外注射时产生的注射冲击力将导线冲散移位；且纤维增强复合材料耐热性能好，避免干式变压器10运行过程中因高压线圈1320产生过高的热量而使绕线体1310发生变形。
结合图7、图9和图10，以A相变压器100为例进行说明。在根据本申请的一个实施例中，导线周向绕制在绕线体1310的外周面上形成高压线圈1320。具体地，导线绕制在绕线部1312的绕线槽1314中，使高压线圈1320在支撑筒1311的轴向上间隔分布，并且导线在绕制完成后首尾端形成两个外接端子，分别为第一外接端子D和第二外接端子X，第一外接端子D用于连接电缆，第二外接端子X用于连接其他外接线，比如在三相变压器中，用于与各相变压器之间的相互连接。导线在绕线体1310沿其轴向的中部共引出六个分接头，分别为分接头2、分接头3、分接头4、分接头5、分接头6和分接头7，六个分接头形成分接开关，为便于描述，将分接头2、分接头4和分接头6定义为第一分接开关，将分接头3、分接头5和分接头7定义为第二分接开关。
在根据本申请的一个实施例中，结合图7、图9和图12所示，导线包括第一导线和第二导线，第一导线和第二导线均为连续导线，且第一导线外和第二导线外均包覆有绝缘层。可选地，该绝缘层可以为聚酰亚胺膜或者玻纤膜，或者可以为聚酯漆等绝缘材料，或者也可以多种绝缘材料组合使用，在此不作限制。第一导线从绕线部1312的一端沿支撑筒1311的轴向绕制至绕线部1312的中部，并引出三个分接头。参见图9，为方便表述，将绕线部1312的上端定义为第一端，绕线部1312的下端定义为第二端，第一导线从绕线部1312的第一端向绕线部1312的第二端开始绕制，第一导线在所有绕线板1313上第一个绕线槽1314形成的绕线槽圈中缠绕所设计的匝数线圈，形成第一段线圈1321，第一段线圈1321为饼式线圈。每个绕线槽1314中仅设置一饼线圈，即，每一段线圈均仅有一饼线圈。第一导线位于绕线部1312的第一端的内匝导线端形成暴露于高压绝缘层1330外的第一外接端子D，也就是在第一段线圈1321的内匝导线端(即第一导线的首端)引出第一外接端子D，第一段线圈1321的外匝导线端延伸至所有绕线板1313上第二个绕线槽1314形成的绕线槽圈内继续绕制形成第二段线圈1322，依次类推，直至第一导线绕至绕线体1310的中部，并通过其中三段线圈的外匝导线端分别引出三个分接头，即如图12所示的分接头6、分接头4和分接头2，至此第一导线完成绕制。
第二导线从绕线部1312的中部沿支撑筒1311的轴向绕制至绕线部1312的第二端，并引出另外三个分接头。具体地，第二导线在与分接头2相邻的下一个绕线槽1314形成的绕线槽圈中开始绕制，形成第三段线圈1323，第二导线以与第一导线同样的绕制方式向绕线部1312的第二端继续绕制，从第三段线圈1323开始的三段线圈中分别引出另外三个分接头，即分接头3、分接头5和分接头7，直至第二导线绕至绕线部1312的第二端的每个绕线板1313上最后一个绕线槽1314形成的绕线槽圈中，并形成终端段线圈1324。第二导线位于绕线部1312的第二端的外匝导线端形成暴露于高压绝缘层1330外的第二外接端子X，也就是在终端段线圈1324的外匝导线端(即第二导线的末端)引出第二外接端子X，至此第二导线完成绕制。
导线绕制时，在所有绕线板1313的绕线槽1314形成的绕线槽圈中进行绕制，使得导线绕制形成的每段线圈均与支撑筒1311的轴向垂直，绕制方便且导线布置整齐，绕线板1313及支撑筒1311受力均匀，机械强度好。
如此，形成了饼式高压线圈1320，该线圈结构具有较好的机械强度，对于短路电流产生的电动力的承受能力强，相比于层式线圈而言，其饼数较多，散热能力也较好。并且，在支撑筒1311的轴向上，结合图10和图12所示，分接头6、分接头4和分接头2依次分布形成第一分接开关，分接头3、分接头5和分接头7依次分布形成第二分接开关，且第一分接开关与第二分接开关平行设置，六个分接头形成高压线圈1320的分接装置，用于干式变压器10根据不同运行工况调节电压。
导线绕制在绕线体1310上形成高压线圈1320，由此高压线圈1320呈环状，将高压线圈1320的环宽定义为高压线圈1320的宽度，则高压线圈1320在其各径向截面上的宽度均一致，即高压线圈1320的外侧面与支撑筒1311的外周面等间距，使高压线圈1320整体受力平衡。考虑到实际操作情况，各线圈在其径向截面上的宽度也可以不完全相同，只要大致相同即可。
本实施例中，第二导线从与分接头2相邻的下一个绕线槽1314形成的绕线槽圈中开始绕制至绕线部 1312的第二端的最后一个绕线槽1314形成的绕线槽圈中。在其他实施例中，第二导线也可以从绕线部的第二端的最后一个绕线槽形成的绕线槽圈中开始向上绕制至与分接头2相邻的下一个绕线槽形成的绕线槽圈中，只不过先形成第二外接端子X，再依次形成分接头7、分接头5和分接头3。当然，高压线圈1320的绕制方式也不限于以上的方式，也可以采用其他方式形成饼式线圈或者层式线圈，只要能够最终形成高压绕组130即可。
本实施例中，分接开关包括六个分接头，此时干式变压器10有五个档位可调节电压，在其他实施例中，分接开关也可以包括四个分接头，即第一分接开关和第二分接开关分别包括两个分接头，此时干式变压器包括三个档位可调节电压，只要符合干式变压器的实际使用需求即可，在此不作限制。
如图9-图11所示，高压绝缘层1330包裹高压线圈1320和绕线体1310后形成高压绕组130。高压绝缘层1330为注射成型硅橡胶，比如高温硫化硅橡胶或注射用液态硅橡胶等。注射成型硅橡胶采用注射工艺成型，成型速度快，生产效率高，无裂纹、气隙，产品局放小；并且由于是硅橡胶弹性体，在装配后，高压绕组130与各个部件连接的部位都可以实现弹性减振，极大地降低了干式变压器10运行中的噪音。以高压绝缘层1330采用高温硫化硅橡胶为例，先将导线绕制在绕线体1310上形成高压线圈1320，将绕线体1310和高压线圈1320作为待注射体，将待注射体放入注射机的模具中，通过添加硅橡胶原料，在待注射体的外周整体注射高温硫化硅橡胶，得到高压绕组130。高压绝缘层1330采用高温硫化硅橡胶，整体提高了高压绕组130的绝缘性能和机械性能。
根据本申请的实施例的高温硫化硅橡胶采用高温硫化硅橡胶材料体系，具体包括生胶、补强剂、阻燃剂、耐热剂和其他辅助材料。
通过整体真空注射高温硫化硅橡胶包覆高压线圈1320和绕线体1310后，高温硫化硅橡胶填充高压线圈1320和绕线体1310之间的缝隙并包裹绕线体1310的两端，且高温硫化硅橡胶不包覆支撑筒1311的内壁，使高压绕组130整体呈空心柱状。可选地，高压绕组130可以是空心圆柱体，也可以是空心椭圆柱体，或者是其他空心柱状体。
在整体注射高温硫化硅橡胶之前，通过设置工装连接件101，连接六个分接头，避免六个分接头在注射过程中也被硅橡胶包覆而无法用于接线。如图11所示，工装连接件101为铝合金板件，工装连接件101的板面上设有保护腔，分接头连接固定于该保护腔内。在本申请中，该保护腔为六个相同的台阶孔1011，且台阶孔1011的内壁还设有螺纹。六个分接头分别连接至六个台阶孔1011，可以通过焊接方式连接，也可以通过其他方式固定连接，在此不作限制。并且，工装连接件101上的六个台阶孔1011平行设置成两列，每列设置三个台阶孔1011使第一分接开关与第二分接开关也平行设置。同时，在整体注射之前，六个分接头分别连接至六个台阶孔1011之后，六个台阶孔1011内均连接螺栓，如此，螺栓可直接填充台阶孔1011剩余空间，防止硅橡胶填充六个台阶孔1011，从而避免六个分接头被硅橡胶包覆后无法用于接线。
工装连接件101的两个相对的侧面还设有两个对称的连接槽1012，注射模具中对应设有两个连接块，工装连接件101置于注射模具中时，通过工装连接件上的两个连接槽1012分别与注射模具上的两个连接块卡设连接，使工装连接件101在注射模具中固定，防止在注射硅橡胶的过程中由于较大的注射压力使工装连接件101的位置发生偏移。
在其他实施例中，还可以是工装连接件的两个相对的侧面设有两个对称的连接块，注射模具中对应设有两个连接槽，工装连接件置于注射模具中时，通过工装连接件上的两个连接块分别与注射模具上的两个连接槽卡设连接，使工装连接件在注射模具中固定，防止在注射硅橡胶的过程中由于较大的注射压力使工装连接件的位置发生偏移。当通过整体注射形成高压绝缘层1330后，工装连接件101的侧面被包覆少量硅橡胶，由于包覆在工装连接件101上的硅橡胶比较少量，可直接通过工具拆除工装连接件101，露出第一分接开关和第二分接开关，最终形成如图10所示的高压绕组130。
在本实施例中，工装连接件101设置为一个，在其他实施例中，工装连接件也可以设置为两个，此时的工装连接件尺寸设置更小，每个工装连接件上开设三个台阶孔，六个分接头分别与该六个台阶孔连接即可，在此不作限制。
在本实施例中，如图13所示，图13示出了包覆有高压绝缘层1330的高压绕组130沿其轴向剖切的局 部截面图。导线采用前述实施例中所述绕制方法，绕制在梳齿状的绕线板1313中，形成饼式高压线圈1320，在沿高压绕组130的轴向上，饼式高压线圈1320与绕线板1313的梳齿间隔设置，即相邻两个梳齿之间设有一饼线圈。
在另一实施例中，如图14所示，图14示出了包覆有高压绝缘层2330的高压绕组230沿其轴向剖切的局部截面图。导线通过双绕组连续式绕法绕制在梳齿状的绕线板2313上，形成高压线圈2320。采用两根相同的连续导线相邻设置后同时从所有绕线板2313上端对应的一圈绕线槽2314中开始绕制，形成第一段线圈2321，第一段线圈2321包括沿支撑筒2311轴向紧邻排列的两饼线圈，具体绕制的方法与前述实施例中的高压线圈1320一致，依次类推向下绕制，继续形成第二段线圈2322等其他线圈，直至形成沿高压绕组230的轴向间隔设置的高压线圈2320，每段线圈均包括紧邻排列的两饼线圈，每段线圈沿绕线板2313轴向的长度等于两根并列导线沿支撑筒2311轴向的宽度之和，也即绕线板2313上的相邻两个梳齿间设置两饼线圈。在本申请中，相同的两根导线指该两根导线的尺寸、材质均一致。相比单根导线的连续式绕组结构(即前述高压线圈1320的结构)，在同样尺寸规格的高压绕组中，能够减少绕线槽2314的个数，由此减少了每段线圈的间隔段之间的导线过渡段，从而减少了导线的用量，达到降低成本的目的。在其他实施例中，绕线板上的相邻两个梳齿间也可以设置三饼线圈或者更多饼线圈。
在又一实施例中，如图15所示，图15示出了包覆有高压绝缘层3330的高压绕组330沿其轴向剖切的局部截面图。绕线板3313上的绕线槽3314沿支撑筒3311轴向的宽度大于上述绕线板2313上绕线槽2314沿支撑筒2311轴向的宽度。导线先通过层式绕法形成第一段线圈3321，具体地，采用一根连续导线，在所有绕线板3313上端对应的一圈第一个绕线槽3314中，沿支撑筒3311的轴向在第一个绕线槽3314内的上端向下进行连续绕制，直至导线绕至第一个绕线槽3314的下端，形成第一层线圈，第一层线圈的导线在支撑筒3311的外周面呈紧密排布的螺旋状，当导线完成第一层线圈的绕制后，反向沿支撑筒3311的轴向由第一个绕线槽3314的下端向上继续绕制第二层线圈，依次类推往复绕制，直至第一段线圈3321达到高压线圈3320在支撑筒3311径向上的预设宽度，最终第一段线圈3321在支撑筒3311的外周面呈紧密排布的螺旋状。然后，导线通过绕线板3313的梳齿过渡到第二个绕线槽3314中，继续按层式绕法绕制形成第二段线圈3322，依次类推继续绕制，直至完成所有绕线槽3314内导线的绕制，从而最终形成高压线圈3320。
由于绕线槽3314沿支撑筒3311轴向的宽度较大，每段线圈沿绕线板3313轴向呈螺旋状排列，且每段线圈沿绕线板3313轴向的长度大于两根并列导线的宽度之和，从而形成多段圆筒式的高压线圈3320，相比采用双绕组连续式绕法绕制的饼式结构(即前述实施例中的高压线圈2320的结构)，在同样规格的高压绕组中，高压线圈3320更紧凑，绕线槽3314的个数更少，从而导线的用量也更少，进一步达到降低成本的目的。
在本实施例中，通过设置绕线板3313，使第一段线圈3321与第二段线圈3322之间间隔了梳齿。在其他实施例中，也可以不设置绕线板，第一段线圈与第二段线圈之间设置有空隙，最终通过填充高压绝缘层使高压线圈固定，同样可以达到高压线圈段间绝缘的目的。
在另一实施例中，如图16所示，图16示出了包覆有高压绝缘层4330的高压绕组430沿其轴向剖切的局部截面图。高压线圈4320的形成方式与前述实施例中的高压线圈3320的形成方式一致，不再赘述。但是高压线圈4320的每段线圈沿支撑筒4311轴向的长度大于高压线圈3320的每段线圈沿支撑筒3311轴向的长度，相同电压等级的干式变压器10，分段圆筒式的高压线圈4320的段数更少。由于高压线圈4320的每段线圈沿支撑筒4311轴向的长度更大，每段线圈之间的电压差就更大，由此每段线圈的层与层之间需要添加绝缘层来降低电压差，此时，每段线圈沿高压绕组430的轴向上设置层间绝缘层4301，防止层间电场强度高于绝缘导线包覆绝缘薄膜的耐受临界值。并且，每段线圈中的层式结构具有很好的抗雷电冲击能力，经济优势也更加明显。具体地，在通过层式绕法绕制导线至一定厚度时，在相应位置上放置层间绝缘层4301后再继续绕制导线，即可将层间绝缘层4301设置在每段线圈中。
层间绝缘层4301可以是网格布，也可以是周向间隔排布的绝缘撑条，或者其他硬质绝缘材料。且该绝缘撑条为边缘呈波浪形的绝缘长条，可防止在注射高温硫化硅橡胶以形成高压绝缘层时由于极高的注射压力使绝缘支撑条损坏。以及绝缘支撑条采用硬质绝缘材料制成，可抵抗硅橡胶高温注射时的冲击力。同时， 层间绝缘层4301可以设置为一层，也可以设置为两层或者三层，根据不同设计情况而定，在此不作限制。在根据本申请的一个实施例中，结合图17-图18所示，绕线体5310与前述实施例中的绕线体1310结构相似，不同之处在于，支撑筒5311与绕线部5312卡设连接。具体地，绕线体5310还包括辅助件5316，辅助件5316位于支撑筒5311的外周面的中部位置上，且沿支撑筒5311的径向向外延伸，使辅助件5316环绕支撑筒5311一周而呈环状盘面。绕线板5313或辅助件5316上设置卡槽，绕线板5313与辅助件5316通过卡槽卡设连接。在本实施例中，每个绕线板5313上均设有第一卡槽53131，且第一卡槽53131与辅助件5316的位置对应匹配设置，使辅助件5316卡设在各第一卡槽53131内。
绕线板5313较长的侧边沿支撑筒5311的轴向设置，若干绕线槽5314沿支撑筒5311的径向设置且沿支撑筒5311的轴向间隔分布，使绕线板5313形成若干梳齿。第一卡槽53131位于绕线板5313上，且与绕线槽5314相背设置，即第一卡槽53131沿支撑筒5311的径向设置，且第一卡槽53131位于绕线板5313靠近支撑筒5311的侧面，使凸出支撑筒5311外周面的辅助件5316能够卡设在第一卡槽53131内。辅助件5316可以保持绕线板5313的稳固设置，避免了导线绕制过程中以及高压绝缘层注射过程中绕线板5313的移动错位。
第一卡槽53131位于绕线板5313的中间位置，且在支撑筒5311的径向上，第一卡槽53131从绕线板5313靠近支撑筒5311的侧边延伸至绕线板5313中间位置的一个梳齿上，或者在支撑筒5311的径向上，第一卡槽53131与绕线板5313中间位置的一个梳齿平齐设置但不延伸至梳齿上。一方面，避免第一卡槽53131与绕线槽5314平齐设置影响绕线板5313的机械强度，甚至造成绕线板5313受力断裂；另一方面，由于绕线板5313中间位置的梳齿的齿高较大，能够进一步降低第一卡槽53131对绕线板5313的机械强度的影响。同时，第一卡槽53131在支撑筒5311径向上的槽深与辅助件5316凸出支撑筒5311的宽度相匹配，使得辅助件5316与绕线板5313装配好后，辅助件5316的外侧面与第一卡槽53131的内侧面紧贴，机械强度好，紧固可靠。若第一卡槽53131的槽深小于辅助件5316凸出支撑筒5311的宽度，则绕线板5313与支撑筒5311之间留有空隙，导线绕制过程中以及高压绝缘层注射过程中存在绕线板5313以辅助件5316为中心发生弯折的风险；若第一卡槽53131的槽深大于辅助件5316凸出支撑筒5311的宽度，第一卡槽53131与辅助件5316之间留有空隙，则辅助件5316起不到紧固作用。
辅助件5316由玻璃纤维浸渍环氧树脂制成，先通过模压形成带有一定厚度的圆环件，然后通过粘接剂将辅助件5316固定连接在支撑筒5311的外周面上，以最大限度地节省用料并且节约成本。当然，辅助件也可以与支撑筒一体成型，即先制成一个厚度较大的空心管，然后车削从而同时形成绕线板5313和辅助件5316。
在本实施例中，设置有一个辅助件5316和一组第一卡槽53131。在其他实施例中，也可以设置有多个辅助件，例如两个或者三个，相应地，也可以沿支撑筒的轴向间隔对应设置多组第一卡槽，例如两组或者三组。在这样的实施例中，各组辅助件和第一卡槽沿支撑筒的轴向间隔分布，有效均布绕线板的承受强度，使绕线板结构更稳定。例如在一实施例中，在支撑筒外周面的中部和两端位置各设置一个辅助件，每个绕线板上均对应设有三个第一卡槽。
在根据本申请的一个实施例中，结合图19-图20所示，与前述实施例中的支撑筒5311的差异在于，支撑筒6311外周面的辅助件6316上开设若干第二卡槽63161，且若干第二卡槽63161在辅助件6316的周向上等间距地布置，即每一个第二卡槽63161与一个绕线板匹配对应。在这样的实施例中，绕线板上无需开设卡槽，绕线板直接卡设在第二卡槽63161内。一方面，可以保持绕线板的稳固设置，避免了导线绕制过程中以及高压绝缘层注射过程中绕线板的移动错位；另一方面，避免了因在绕线板上开设卡槽而影响绕线板的机械强度。辅助件6316与前述实施例中的辅助件5316的材质、成型方式一致，在此不再赘述。
在其他实施例中，如图21-图22所示，绕线体也可以不设置支撑筒，也即该绕线体省去了刚性绝缘内衬筒的结构，使得高压绕组的导热效果更好，消除了高压绝缘层与刚性绝缘内衬筒之间的界面，从而抑制了刚性绝缘内衬筒表面放电，且节约了材料，降低了成本。
具体地，绕线体包括绕线部7310和若干辅助件7312，绕线部7310包括若干梳齿状的绕线板7311。若干辅助件7312呈环状且沿辅助件7312的轴向间隔设置。绕线板7311沿辅助件7312的轴向固定在若干辅 助件7312的外周，每一个绕线板7311同时连接所有辅助件7312。若干绕线板7311沿辅助件7312的周向等间距布置。辅助件7312的轴向即为绕线部7310的轴向，也即高压绕组的轴向。辅助件7312的形状可以根据高压绕组的整体形状设计，例如设计为圆环状、椭圆环状等。若干绕线板7311沿辅助件7312的周向设置，导线绕制在绕线部7310上形成高压线圈，且高压线圈包括若干段线圈，若干段线圈沿高压绕组的轴向间隔布置，高压绝缘层包裹高压线圈、若干辅助件7312和绕线板7311。辅助件7312可以保持绕线板7311的稳固设置，避免了导线绕制过程中以及高压绝缘层注射过程中绕线板7311的移动错位。
在一实施例中，辅助件7312的外表面设有若干第三卡槽73121，若干第三卡槽73121沿辅助件7312的周向等间距地设置。若干辅助件7312的第三卡槽73121在辅助件7312的轴向上彼此对齐，以形成若干第三卡槽列，第三卡槽列的数量与绕线板7311的数量相对应。每个绕线板7311卡设在对应的一个第三卡槽列中，使绕线板7311在周向上等间距地布置在若干辅助件7312的外周。进一步地，所有绕线板7311的两端平齐设置，并且所有辅助件7312上的第三卡槽73121在辅助件7312的轴向上彼此对齐，使每个绕线板7311能够沿辅助件7312的轴向设置，进而使导线在绕线板7311上的梳齿内绕制形成高压线圈，即高压线圈的若干段线圈在绕线部7310的轴向上间隔分布，受力均衡，机械强度好。
将第三卡槽73121沿辅助件7312的周向方向的宽度定义为第三卡槽73121的槽宽，第三卡槽73121的槽宽与绕线板7311的厚度相匹配，使得绕线板7311与辅助件7312装配牢靠，避免了第三卡槽73121的槽宽小于绕线板7311的厚度时，绕线板7311难以对齐固定在辅助件7312上，或是第三卡槽73121的槽宽大于绕线板7311的厚度时，绕线板7311从辅助件7312外脱落。绕线板7311通过粘接剂固定连接在第三卡槽73121中，粘接剂为双组分耐高温的环氧胶，当然也可以是其他粘接胶，但是需要保证该粘接剂能够使绕线板7311与辅助件7312粘接牢靠，且粘接剂需耐高温，以适应高压绝缘层采用高温注射的方式包覆绕线板7311与辅助件7312。
在其他实施例中，也可以在绕线板靠近辅助件的侧面设置卡槽，辅助件卡设在绕线板的卡槽内，使绕线板与辅助件固定连接。当然，优选前述实施例中在辅助件7312上设置第三卡槽73121，避免绕线板上由于开设卡槽而引起绕线板机械强度削弱。
继续参阅图21，绕线板7311为梳齿板7311，梳齿板7311与前述实施例中的绕线板1313的结构类似，不同之处在于，梳齿板7311的两端均设有流通槽73111，便于高压绝缘层注射成型过程中，注射的硅橡胶原料能够从绕线部7310的端部流入绕线部7310的内侧，进而使高压绝缘层充分填充绕线部7310与高压线圈之间的间隙以及绕线部7310的两端。
绕线板7311与辅助件7312均由玻璃纤维浸渍环氧树脂制成，通过多层玻璃纤维布浸渍环氧树脂后叠加成一定厚度，并模压固化形成玻璃钢件。在本实施例中，绕线板7311与辅助件7312分体成型后粘接固定。在其他实施例中，绕线板与辅助件也可以一体成型。
在另一实施例中，参见图23-图24，高压绕组830包括绕线部8312、高压线圈8320和高压绝缘层8330。绕线部8312在高压绕组830的内侧呈周向设置，导线绕制在绕线部8312的外侧形成高压线圈8320。高压绝缘层8330包裹高压线圈8320和绕线部8312。相比于前述实施例中的高压绕组130而言，高压绕组830仅设置绕线部8312作为绕线体，不设置刚性绝缘内衬筒，即不设置支撑筒。省去了刚性绝缘内衬筒的结构，一方面，使得高压绕组830的导热效果更好，消除了高压绝缘层8330与刚性绝缘内衬筒之间的界面，从而抑制了刚性绝缘内衬筒表面放电；另一方面，还节约了材料，降低了成本。
绕线部8312包括若干梳齿状的绕线板8313，若干绕线板8313间隔设置且在高压绕组830的内侧的周向上等间距地布置，每个绕线板8313沿高压绕组830的轴向设置。高压线圈8320包括若干段线圈，绕线板8313上的相邻两个梳齿间至少设置一段线圈。绕线板8313的数量至少为两个。可选地，绕线板8313的数量可以为两个、三个、四个或者更多，在此不作限制。
绕线板8313上还设有若干绕线槽8314，由此绕线板8313呈梳齿状，也即绕线板8313上形成有若干梳齿。绕线板8313的具体结构、材质、成型方式等与前述绕线板1313一致，在此不再赘述。
在另一实施例中，如图25-图28所示，高压绕组930与前述高压绕组830基本相同，不同之处在于绕线体9310包括绕线部9312和辅助件9316，绕线部9312与辅助件9316固定连接。在本实施例中，绕线部 9312是若干绕线板9313。辅助件9316呈环状且与高压绕组930同轴，套设并固定在若干绕线板9313上。设置辅助件9316可以保持绕线板9313的稳固设置，避免了导线绕制过程中以及高压绝缘层注射过程中绕线板9313的移动错位。
具体地，辅助件9316包括至少一个端部辅助件93161，端部辅助件93161设置于绕线板9313的端部外侧，既能保持绕线板9313的稳固设置，又不会对导线的绕制产生影响。参阅图26，在绕线板9313的端部外侧设置凹槽9317，端部辅助件93161嵌入凹槽9317中，保证了端部辅助件93161与绕线板9313的有效连接。凹槽9317位于绕线板9313的梳齿侧，即位于绕线板9313远离高压绕组930轴心的一侧，使得端部辅助件93161对绕线板9313所起的固定作用更佳，避免了导线绕制过程中以及高压绝缘层9330注射过程中绕线板9313的移动错位。凹槽9317的槽深大于或者等于端部辅助件93161的厚度，便于注射时硅橡胶原料包覆绕线板9313的端部及端部辅助件93161，且不易受外部的力影响导致绕线板9313与端部辅助件93161的连接失效。端部辅助件9316通过粘接剂固定连接在凹槽9317中，粘接剂为双组分耐高温的环氧胶，当然也可以是其他粘接胶，但是需要保证该粘接剂能够使端部辅助件9316与绕线板9313粘接牢靠，且耐高温，以适应高压绝缘层9330采用高温注射的方式包覆在绕线板9313与端部辅助件93161的外周。在其他实施例中，端部辅助件也可以与凹槽尺寸完全匹配，使得端部辅助件卡固在凹槽中而无需粘接剂固定。
在本实施例中，绕线板9313的两个端部外侧均设置有端部辅助件93161，使得绕线板9313的两端均被辅助件9316固定，可以有效保持绕线板9313的稳固设置。在其他实施例中，也可以仅在绕线板的其中一个端部外侧设置端部辅助件。
结合图25和图27，辅助件9316还包括中部辅助件93162，将绕线板9313围成空腔时，用于形成空腔的内壁的一侧表面定义为绕线板9313的内壁，中部辅助件93162设置于绕线板9313的内壁，不会影响绕线板9313梳齿侧导线的绕制。参考图27，绕线板9313的内壁设置第四卡槽93131，中部辅助件93162卡固在第四卡槽93131中，保证了中部辅助件93162与绕线板9313的有效连接。第四卡槽93131的槽深与中部辅助件93162的环宽相匹配，使得中部辅助件93162与绕线板9313装配好后，中部辅助件93162的内壁与绕线板9313的内壁平齐，避免了第四卡槽93131的槽深小于中部辅助件93162的环宽时，导线绕制过程中以及高压绝缘层9330注射过程中绕线板9313以中部辅助件93162为中心发生弯折，或是第四卡槽93131的槽深大于中部辅助件93162的环宽时，中部辅助件93162起不到紧固作用。
在本实施例中，辅助件9316包括两个端部辅助件93161和一个中部辅助件93162，使得绕线板9313在导线绕制过程中以及高压绝缘层9330注射过程中均可保持位置的稳固，不发生移动错位，避免两段线圈离得太近，绝缘距离不够，产生放电。在其他实施例中，可以仅设置端部辅助件，或者可以仅设置中部辅助件，或者也可以沿高压绕组的轴向间隔设置多个辅助件，能够对绕线板起到加固作用即可。
辅助件9316也由玻璃纤维浸渍环氧树脂制成，通过多层玻璃纤维布浸渍环氧树脂后叠加成一定厚度，并模压固化形成环状的玻璃钢板件。辅助件9316可以为圆环状，也可以是椭圆环状，或者其他环状。端部辅助件93161的厚度需小于绕线板9313两端的齿高，中部辅助件93162对其厚度不作要求时，其环宽需要小于绕线板9313非梳齿部位的宽度，即绕线板9313的整体宽度减去其绕线槽9314的宽度，或者对中部辅助件93162的环宽不作要求时，其厚度需要小于绕线板9313中部的梳齿的齿高。如此设置避免了辅助件9316占据绕线槽9314，影响导线在绕线板9313上的绕制。
可选地，辅助件9316与绕线板9313分体成型后粘接固定，或者辅助件9316与绕线板9313一体成型。
导线周向绕制在绕线板9313的外周面上形成高压线圈9320(参考图31)。再经高温硫化硅橡胶通过整体真空注射包覆绕线部9312、高压线圈9320和辅助件9316形成高压绕组930。
根据本申请的实施例的干式变压器的有益效果至少包括：区别于现有技术的情况，本申请的干式变压器的高压绕组包括绕线体、高压线圈和注射成型硅橡胶的高压绝缘层，相比现有技术中的环氧树脂高压绝缘层，具备如下优势：1)具备较好的防火性能、抗低温性能、耐老化性能及抗短路试验能力，可有效延长干式变压器的使用寿命；2)铜线圈易从硅橡胶上剥离，材料可回收率大于99％，更为绿色环保；3)硅橡胶弹性体一方面可减弱机械振动带来的局放诱因，对设备放电具有抑制效果，且硅橡胶在放电作用下产物为非 导电的二氧化硅，可有效抑制绝缘继续劣化，另一方面由于装配后各个部件可以通过硅橡胶弹性体实现减振连接，可以极大地减振降噪；4)能够降低变压器的运行损耗，更节能；5)硅橡胶具有憎水性和憎水迁移性，且耐电蚀、阻燃效果好，同时是H级绝缘材料，绝缘性能好，所以耐恶劣环境的能力好，能够安装在户内和户外。同时，本申请的硅橡胶是通过整体高温硫化注射成型，此工艺方法使高压绝缘层更稳固，机械性能更高，且与高压线圈、绕线体的粘接性能更好，能有效延长高压绝缘层的使用寿命。本申请的注射用硅橡胶填料分散均匀，不会因填料团聚而使干式变压器产生局部放电，使干式变压器的整体性能更优。
结合图1以及图7-图16，根据本申请的实施例还提供了一种制备高压绕组130的方法，该方法至少包括如下步骤：
步骤1000：导线沿绕线体1310的外周面进行周向绕制形成高压线圈1320，导线绕制过程中形成分接头。
绕线体1310的具体结构、材质、成型方法等均如前所述，不再赘述。
将绕线体1310套设在绕线设备上，将导线绕制在绕线体1310上，使得高压线圈1320沿支撑筒1311的轴向间隔布置，从而形成饼式高压线圈1320。导线绕制方式及高压线圈1320的结构与前述一致，不再赘述。且导线在绕制过程中，分别引出分接头2、分接头3、分接头4、分接头5、分接头6和分接头7，从而形成分接开关。
在其他实施例中，导线也可以绕制成如图14-图16所示的双绕组连续式高压线圈2320、多段圆筒式高压线圈3320和分段圆筒式高压线圈4320，也可以仅引出四个分接头，具体如前所述，不再赘述。
步骤1100：将分接头置于工装连接件101的保护腔且与工装连接件101连接固定。
通过如图11所示的工装连接件101，将六个分接头分别连接固定于工装连接件101的保护腔。可选地，该保护腔为六个台阶孔1011，可以通过焊接方式连接，也可以通过其他方式固定连接，在此不作限制。
步骤1200：将绕制有高压线圈1320的绕线体1310作为待注射体放入注射机的模具中，在待注射体外周注射高温硫化硅橡胶，使得高温硫化硅橡胶包覆高压线圈1320和绕线体1310。
在步骤1200之前，在工装连接件101的六个台阶孔1011内均连接螺栓，如此，螺栓可直接填充台阶孔1011剩余空间，防止硅橡胶填充六个台阶孔1011，从而可以避免六个分接头被硅橡胶包覆后无法用于接线。
将绕线体1310和连接有工装连接件101的高压线圈1320作为待注射体，然后在待注射体的外周涂覆偶联剂后，将待注射体放入注射机的模具中，添加硅橡胶原料，在待注射体的外周整体注射高温硫化硅橡胶，待冷却后得到高压绕组130，高温硫化硅橡胶的高压绝缘层1330整体提高了高压绕组130的绝缘性能和机械性能。
高温硫化硅橡胶通过整体真空注射包覆高压线圈1320和绕线体1310后，高温硫化硅橡胶填充高压线圈1320和绕线体1310之间的缝隙以及绕线体1310的两端，且高温硫化硅橡胶不包覆支撑筒1311的内壁，使高压绕组130整体呈空心柱状，可以是空心圆柱体，也可以是空心椭圆柱体，或者是其他空心柱状体。在其他实施例中，也可以采用注射用液态硅橡胶等其他的注射成型硅橡胶包覆高压线圈1320和绕线体1310。
步骤1300：移除工装连接件101，得到分接头暴露于高温硫化硅橡胶外的高压绕组130。
当通过真空注射形成高压绝缘层1330后，工装连接件101的侧面被包覆少量硅橡胶，由于包覆在工装连接件101上的硅橡胶比较少量，可直接通过工具拆除工装连接件101，露出分接头，最终形成如图10所示的高压绕组130。
参考图25至图32，本申请的实施例还提供了一种用于制备高压绕组930的方法，该方法至少包括如下步骤：
步骤2000：在绕制工装90的外周面贴耐高温膜(图中未示出)。
如图29所示，绕制工装90包括模具91和连接杆92，连接杆92沿模具91的轴向穿设模具91，连接杆92用于将绕制工装90与缠绕机连接，进行导线绕制。模具91为中空壳体，可以是空心圆柱体，也可以是空心椭圆柱体，或者是其他空心柱状体，模具91的外周面与高压绕组930的内周面相匹配即可。中空的模具91质量较轻，可保证绕制工装90在缠绕机的承载范围内。另外，为了保证注射时绕制工装90可承受 住注射压力，可采用铁等硬金属材质制作模具91，也可在模具91内部焊接加强筋以提高模具91的机械强度。
耐高温膜用耐高温的聚酰亚胺胶带或者其他耐高温胶带固定在模具91的外周面，可使得注射高温硫化硅橡胶后的高压绕组930易于脱模。为了使导线与高温硫化硅橡胶更好地进行粘接，会在导线上涂覆偶联剂，而现有技术中为方便注射后的脱模，一般会在模具外涂覆脱模剂，而偶联剂与脱模剂在高温下会发生化学反应，影响高压绕组930的性能，为避免这种情况发生，又易于脱模，本申请将脱模剂替换成耐高温膜。
本领域技术人员应该知晓，耐高温膜为一种至少可以耐105℃高温的膜，由于注射机注射时，一般温度为105℃及以上，且耐高温膜需保证在最高注射温度下不被破坏即可。比如可以为FEP薄膜，FEP薄膜是一种耐高温隔离膜，具有耐-200℃～200℃高低温、低摩擦性、不粘性和润滑性、耐化学腐蚀性、热稳定性和电绝缘性，在最高注射温度下也不会被破坏。另外，也可使用聚酰亚胺薄膜等耐高温膜，只要在最高注射温度时不会被破坏即可。显而易见的是，耐更高温度的膜也可以适用。
由于高压绕组930不包括刚性绝缘内衬筒，故其内周面的形状与模具91外周面的形状相匹配，通过改变绕制工装90的模具91的大小与形状，可以生产出不同内径与内周面形状的高压绕组930。
步骤2100：将绕线部9312固定在耐高温膜上，并加装辅助件9316使得辅助件9316稳定卡固绕线部9312。
在根据本申请的一个实施例中，辅助件9316包括中部辅助件93162，先将中部辅助件93162套设于绕制工装90上的耐高温膜外。参见图30，中部辅助件93162套设于模具91的外周面，具体地，先将中部辅助件93162套设于模具91的中部，后续可根据绕线板9313上的第四卡槽93131的位置进行调整以使得中部辅助件93162卡合在第四卡槽93131中。
然后再将绕线部9312沿绕制工装90的周向设置并使得中部辅助件93162的内壁与绕线部9312的内壁平齐。通过粘接剂将绕线部9312沿绕制工装90的周向粘接在耐高温膜上，在绕线部9312上设置若干绕线槽9314，用于后续绕制导线。
结合图27和图30，当绕线部9312为若干梳齿状的绕线板9313时，将若干绕线板9313间隔设置并周向均布在绕制工装90上，每个绕线板9313均沿绕制工装90的轴向设置。绕线板9313上设置若干绕线槽9314，使得绕线板9313呈梳齿状，绕线槽9314用于后续绕制导线，绕线板9313的内壁通过粘接剂粘接在耐高温膜上，绕线板9313的内壁设置第四卡槽93131，中部辅助件93162卡合在第四卡槽93131中。绕线板9313通过第四卡槽93131与中部辅助件93162卡合，中部辅助件93162与绕线板9313也通过粘接剂粘接。
在根据本申请的一个实施例中，辅助件9316包括端部辅助件93161，先将绕线部9312沿绕制工装90的周向设置，再将端部辅助件93161固定在绕线部9312的端部外侧，端部辅助件93161与绕制工装90同轴。
结合图26和图30，通过粘接剂将端部辅助件93161粘接固定在绕线部9312的端部外侧，既能保持绕线部9312的稳固设置，又不会对导线的绕制产生影响。
上述粘接剂均为双组分耐高温的环氧胶，当然也可以是其他粘接胶，但是需要保证该粘接剂能够使中部辅助件93162、端部辅助件93161与绕线部9312粘接牢靠，且耐高温，以适应高压绝缘层9330采用高温注射的方式包覆在绕线部9312与辅助件9316的外周。
进一步地，辅助件9316包括两个端部辅助件93161。将两个端部辅助件93161分别粘接在绕线部9312的两个端部外侧，端部辅助件93161与绕制工装90同轴。
在根据本申请的一个实施例中，辅助件9316同时包括一个中部辅助件93162、两个端部辅助件93161，先将中部辅助件93162套设于模具91的外周面，再将若干绕线板9313固定在绕制工装90外表面并使得中部辅助件93162卡合在第四卡槽93131中，然后再将两个端部辅助件93161分别粘接在绕线部9312的两个端部外侧，使得端部辅助件93161嵌入凹槽9317中。在其他实施例中，也可以先将中部辅助件、端部辅助件与绕线部粘接固定之后再套设固定于绕制工装上。
步骤2200：在绕线部9312上绕制导线形成具有分接开关的高压线圈9320。
图31示出了导线的绕制方式，导线包括第一导线和第二导线。本实施例的导线的绕制方式与图9所示的实施例相同，不再赘述。
步骤2300：参见图32，将绕制有高压线圈9320的绕线部9312作为待注射体连同绕制工装90放入注射机，在待注射体外周整体注射高温硫化硅橡胶形成高压绝缘层9330，得到高压绕组930。
步骤2400：将高压绕组930从绕制工装90上脱模。
将绕制工装90与高压绕组930分离即可脱模，脱模方式采用行业内常用方式，不再赘述。
在根据本申请的一个实施例中，在步骤2400之后还包括：
步骤2500：修剪高压绕组930内表面残留的耐高温膜的毛边，防止毛边产生局部放电。
在其他实施例中，若高压绕组内表面未残留耐高温膜的毛边，则无需实施步骤2500。或者在步骤2500中也可以采取撕拉去除残余的耐高温膜的方式使得高压绕组内壁保持清洁光滑。
本申请的高压绕组930的制备方法步骤简单，所需的绕制工装90结构简单，易于制得，且通过该方法制备所得的高压绕组930省去了刚性绝缘内衬筒，使得高压绕组930的导热效果更好，不存在高压绝缘层9330与刚性绝缘内衬筒之间的界面，从而也不存在刚性绝缘内衬筒表面放电的情况，且节约了材料，降低了成本。
本申请的技术内容及技术特点已揭示如上，然而可以理解，在本申请的创作思想下，本领域的技术人员可以对上述结构和材料作各种变化和改进，包括这里单独披露或要求保护的技术特征的组合，明显地包括这些特征的其它组合。这些变形和/或组合均落入本申请所涉及的技术领域内，并落入本申请权利要求的保护范围。

Claims (31)

  1. 一种高压绕组，其特征在于，所述高压绕组包括绕线体、高压线圈和高压绝缘层，导线绕制在所述绕线体上形成所述高压线圈，所述高压绝缘层包裹所述高压线圈和所述绕线体。
  2. 如权利要求1所述的高压绕组，其特征在于，所述绕线体采用纤维增强复合材料制成。
  3. 如权利要求1所述的高压绕组，其特征在于，所述高压绝缘层为注射成型硅橡胶。
  4. 如权利要求1所述的高压绕组，其特征在于，所述绕线体包括绕线部，所述高压线圈包括若干段线圈，若干段所述线圈绕制在所述绕线部上且沿所述高压绕组的轴向间隔设置。
  5. 如权利要求4所述的高压绕组，其特征在于，所述导线包括第一导线和第二导线，所述第一导线从所述绕线部的第一端沿所述高压绕组的轴向绕制至所述绕线部的中部，所述第二导线从所述绕线部的所述中部沿所述高压绕组的轴向绕制至所述绕线部的第二端。
  6. 如权利要求5所述的高压绕组，其特征在于，所述第一导线位于所述绕线部的所述第一端的内匝导线端形成暴露于所述高压绝缘层外的第一外接，所述第二导线位于所述绕线部的所述第二端的外匝导线端形成暴露于所述高压绝缘层外的第二外接。
  7. 如权利要求4所述的高压绕组，其特征在于，所述绕线部包括若干绕线板，所述绕线板上设有若干梳齿，若干所述绕线板沿所述高压绕组的周向设置，所述绕线板上的相邻两个所述梳齿间至少设置一段所述线圈。
  8. 如权利要求7所述的高压绕组，其特征在于，将所述梳齿沿所述高压绕组的轴向的高度定义为齿高，所述绕线板中部的所述梳齿的齿高和所述绕线板两端的所述梳齿的齿高均大于所述绕线板其他部分的所述梳齿的齿高，使所述绕线板在所述高压绕组的轴向上自一端朝向另一端，依次形成第一高梳齿区、第一低梳齿区、第二高梳齿区、第二低梳齿区、第三高梳齿区。
  9. 如权利要求4所述的高压绕组，其特征在于，每段所述线圈沿所述高压绕组的轴向层式往复绕制。
  10. 如权利要求9所述的高压绕组，其特征在于，所述线圈沿所述高压绕组的轴向设有至少一个层间绝缘层。
  11. 如权利要求10所述的高压绕组，其特征在于，所述层间绝缘层为边缘呈波浪形的绝缘长条。
  12. 如权利要求1所述的高压绕组，其特征在于，所述高压线圈在其各径向截面上的宽度一致。
  13. 如权利要求3所述的高压绕组，其特征在于，所述注射成型硅橡胶通过整体真空注射包覆所述高压线圈和所述绕线体，所述注射成型硅橡胶填充所述高压线圈和所述绕线体之间的缝隙以及所述绕线体的两端。
  14. 如权利要求4所述的高压绕组，其特征在于，所述绕线体还包括支撑筒，所述绕线部设置在所述支撑筒外周面上，所述支撑筒为空心柱体。
  15. 一种制备高压绕组的方法，所述高压绕组是根据权利要求1至13中任一项所述的高压绕组，其特征在于，所述方法包括如下步骤：
    步骤1000：所述导线沿所述绕线体的外周面进行周向绕制形成所述高压线圈，所述导线绕制过程中形成分接头；
    步骤1100：将所述分接头置于工装连接件的保护腔且与所述工装连接件连接固定；
    步骤1200：将绕制有所述高压线圈的所述绕线体作为待注射体放入注射机的模具中，在所述待注射体外周注射注射成型硅橡胶，使得所述注射成型硅橡胶包覆所述高压线圈和所述绕线体；
    步骤1300：移除所述工装连接件，得到所述分接头暴露于所述注射成型硅橡胶外的所述高压绕组。
  16. 如权利要求15所述的方法，其特征在于，所述绕线体包括支撑筒和位于所述支撑筒外周面上的绕线部，在所述步骤1000中，将所述导线绕制在所述绕线部上形成所述高压线圈。
  17. 如权利要求15所述的方法，其特征在于，在所述步骤1100中，所述保护腔为台阶孔，将所述分接头焊接在所述台阶孔中。
  18. 如权利要求17所述的方法，其特征在于，所述台阶孔的内壁设有螺纹，在所述步骤1200前，在所述台阶孔内连接螺栓。
  19. 如权利要求16所述的方法，其特征在于，在所述步骤1000前，采用玻璃纤维浸渍环氧树脂制成所述支撑筒和所述绕线部。
  20. 如权利要求16所述的方法，其特征在于，所述绕线部包括若干绕线板，在所述步骤1000前，将若干所述绕线板周向均布粘接固定在所述支撑筒的外周面上。
  21. 如权利要求20所述的方法，其特征在于，在所述步骤1000前，在所述绕线板上开设若干绕线槽，使所述绕线板形成若干梳齿。
  22. 如权利要求15所述的方法，其特征在于，在所述步骤1200中，所述注射成型硅橡胶通过整体真空注射包覆所述高压线圈和所述绕线体并填充所述高压线圈和所述绕线体之间的缝隙以及所述绕线体的两端。
  23. 一种制备高压绕组的方法，所述高压绕组是根据权利要求1至13中任一项所述的高压绕组，所述绕线体包括辅助件和绕线部，所述绕线部与所述辅助件固定连接，所述高压绝缘层包裹所述高压线圈、所述绕线部和所述辅助件，其特征在于，所述方法包括如下步骤：
    步骤2000：在绕制工装的外周面贴耐高温膜；
    步骤2100：将所述绕线体固定在所述耐高温膜上，且使所述辅助件稳定卡固所述绕线部；
    步骤2200：在所述绕线部上绕制所述导线形成具有分接开关的所述高压线圈；
    步骤2300：将绕制有所述高压线圈的所述绕线体作为待注射体连同所述绕制工装放入注射机，在所述待注射体外周整体注射注射成型硅橡胶形成所述高压绝缘层，得到所述高压绕组；
    步骤2400：将所述高压绕组从所述绕制工装上脱模。
  24. 如权利要求23所述的方法，其特征在于，所述绕制工装包括模具和连接杆，所述连接杆沿所述模具的轴向穿设所述模具，在所述步骤2000中，将所述耐高温膜用耐高温胶带固定在所述模具的外周面。
  25. 如权利要求23所述的方法，其特征在于，所述辅助件包括中部辅助件，在所述步骤2100中，先将所述中部辅助件套设于所述耐高温膜上，再将所述绕线部沿所述绕制工装的周向设置并使得所述中部辅助件的内壁与所述绕线部的内壁平齐。
  26. 如权利要求25所述的方法，其特征在于，所述绕线部的内壁设置有凹槽，在所述步骤2100中，将所述中部辅助件卡合在所述凹槽中，使所述中部辅助件与所述绕线部固定连接。
  27. 如权利要求23所述的方法，其特征在于，所述辅助件包括端部辅助件，在所述步骤2100中，先将所述绕线部沿所述绕制工装的周向设置，再将所述端部辅助件固定在所述绕线部的端部外侧。
  28. 如权利要求27所述的方法，其特征在于，所述绕线部的端部外侧设置有卡槽，在所述步骤2100中，将所述端部辅助件嵌入所述卡槽中。
  29. 如权利要求23所述的方法，其特征在于，所述绕线部包括若干梳齿状的绕线板，在所述步骤2100中，将若干所述绕线板间隔设置并周向均布在所述绕制工装的外周面。
  30. 如权利要求23所述的高压绕组的制备方法，其特征在于，在所述步骤2400之后还包括：步骤2500：修剪所述高压绕组内表面残留的所述耐高温膜的毛边。
  31. 如权利要求23所述的高压绕组的制备方法，其特征在于，在所述步骤2100中，将所述绕线部或所述辅助件粘接在所述耐高温膜上。
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