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 PDFInfo
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- 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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Classifications
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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
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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
- H01F27/28—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
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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
- H01F27/34—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
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- 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
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- 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
Description
Claims (31)
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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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