CN115621039A - Manufacturing method of short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer - Google Patents
Manufacturing method of short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer Download PDFInfo
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- CN115621039A CN115621039A CN202211556212.9A CN202211556212A CN115621039A CN 115621039 A CN115621039 A CN 115621039A CN 202211556212 A CN202211556212 A CN 202211556212A CN 115621039 A CN115621039 A CN 115621039A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000004804 winding Methods 0.000 claims abstract description 83
- 239000003822 epoxy resin Substances 0.000 claims abstract description 34
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 34
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims description 21
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 19
- 239000003365 glass fiber Substances 0.000 claims description 17
- 239000011087 paperboard Substances 0.000 claims description 10
- 239000000123 paper Substances 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 5
- 239000011152 fibreglass Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000017105 transposition Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 239000011111 cardboard Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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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
- H01F41/098—Mandrels; Formers
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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
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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
-
- 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
- H01F41/077—Deforming the cross section or shape of the winding material while 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
- H01F41/12—Insulating of windings
- H01F41/122—Insulating between turns or between winding layers
-
- 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
- H01F41/127—Encapsulating or impregnating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Insulating Of Coils (AREA)
Abstract
The invention discloses a method for manufacturing an anti-short-circuit three-dimensional triangular wound core oil-immersed transformer, which comprises the following steps: 1) Manufacturing an inner insulating cylinder; 2) Manufacturing an inner low-voltage winding; 3) Manufacturing a main empty channel; 4) Manufacturing an outer-layer high-voltage winding; 5) After the coil is wound, gel-like epoxy resin is coated on the upper end and the lower end of the outer-layer high-voltage winding and the inner-layer low-voltage winding; 6) After finishing the shaping of the transformer winding, moving the transformer winding into a drying room to heat the transformer winding to a specified temperature until the gel-like epoxy resin is cured. The invention has simple process, low preparation cost and high manufacturing efficiency.
Description
Technical Field
The invention relates to the technical field of distribution transformers, in particular to a manufacturing method of an anti-short-circuit three-dimensional triangular wound core oil-immersed transformer.
Background
The three-dimensional triangular wound core does not need to be cut and punched, so that transverse and longitudinal seams of the traditional transformer are eliminated, and the magnetic resistance is reduced; the cross section of the iron core column is circular (or polygonal), the filling coefficient of the iron core is the largest, and the three-phase magnetic circuit of the iron core is equal and the shortest, so that the iron core structure of the ideal transformer is realized. Therefore, the power transformer made of the material has excellent performance which is incomparable with the traditional transformer. The transformer is an efficient, energy-saving and ultra-silent environment-friendly transformer and has a very wide application prospect.
At present, a common three-dimensional triangular wound core transformer in the market is of a cylindrical winding structure, the transformer is of the cylindrical winding structure, the force during sudden short circuit is that the inner-layer low-voltage winding presents inward radial force and the axial force is towards the middle of the winding, and the outer-layer high-voltage winding presents outward radial force and the axial force is towards two ends of the winding; the manufacturing method of the transformer in the prior art has high manufacturing cost and low efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a manufacturing method of an anti-short-circuit three-dimensional triangular wound core oil-immersed transformer, which is simple in process, low in preparation cost and high in manufacturing efficiency.
The purpose of the invention is realized as follows: a manufacturing method of an anti-short-circuit three-dimensional triangular wound core oil-immersed transformer comprises the following steps:
1) Manufacturing an inner insulating cylinder: wrapping a high-density insulating paper board on a winding die, uniformly coating gel epoxy resin outside the high-density insulating paper board, wrapping a weftless glass fiber mesh fabric, and flattening to obtain an in-band insulating cylinder;
2) Manufacturing an inner-layer low-voltage winding: winding an inner-layer low-voltage winding on the periphery of the inner insulating cylinder in the step 1), wrapping a layer of glue-dispensing insulating paper on the periphery of the coil after winding a first layer of coil, coating a gel-like epoxy resin layer at the position of the electromagnetic wire transposition if a plurality of wires are wound, and repeating the step until the inner-layer low-voltage winding reaches a set layer of turns;
3) Manufacturing a main empty channel: winding a main channel at the periphery of the inner-layer low-voltage winding in the step 2), wherein a layer of main channel weftless glass fiber mesh cloth is coated outside the main channel and gel-like epoxy resin is uniformly coated on the main channel weftless glass fiber mesh cloth;
4) Manufacturing an outer-layer high-voltage winding: winding an outer-layer high-voltage winding on the periphery of the main air channel in the step 3), winding a first-layer coil, then coating a layer of glue dispensing paper with a specified number, repeating the step until the outer-layer winding reaches the number of turns of a design layer, coating a layer of weftless glass fiber mesh cloth on the outermost layer, and uniformly coating the gel epoxy resin on the outermost layer;
5) After the coil is wound, gel-like epoxy resin is coated on the upper end and the lower end of the outer-layer high-voltage winding and the inner-layer low-voltage winding;
6) After finishing the shaping of the transformer winding, moving the transformer winding into a drying room to heat the transformer winding to a specified temperature until the gel-like epoxy resin is cured.
As a further limitation of the present invention, the thickness of the high-density insulation paperboard in step 1) is 1mm, and the thickness of the weftless fiberglass mesh fabric is 0.5mm.
As a further limitation of the present invention, the thickness of the main channel laid glass fiber mesh fabric in step 3) is 0.5mm.
As a further limitation of the present invention, the main channel in step 3) is made of a high-density cardboard stay curtain.
As a further limitation of the present invention, the thickness of the laid glass fiber mesh fabric in step 4) is 0.5mm.
The gel-like epoxy resin is prepared by mixing pure epoxy resin, a curing agent and an accelerator according to a weight ratio of 1.
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: the transformer manufactured by the method has higher safety coefficient, and the product has good mechanical strength and short circuit resistance; the method has the advantages of simple process, low preparation cost and high manufacturing efficiency.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic diagram of a transformer structure manufactured by the method of the present invention.
Fig. 3 is a cross-sectional view of one set of coils in the transformer structure of fig. 2.
The winding machine comprises a winding die 1, an inner insulating cylinder 2, a non-weft glass fiber grid cloth 3, an inner layer low-voltage wire group 4, a glue dispensing insulating paper 5, a main air channel 6, a main air channel non-weft glass fiber grid cloth 7, an outer layer high-voltage winding 8, a high-voltage outer layer non-weft glass fiber grid cloth 9, a high-voltage low-voltage winding 10 and a three-dimensional triangular wound core 11, wherein the upper end and the lower end of the high-voltage low-voltage winding are insulated.
Detailed Description
The manufacturing method of the short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer shown in fig. 1 comprises the following steps:
1) Manufacturing an inner insulating cylinder: wrapping a high-density insulating paperboard with the thickness of 1mm on a winding die, uniformly coating gel epoxy resin outside the high-density insulating paperboard, wrapping a weftless glass fiber mesh fabric with the thickness of 0.5mm, and flattening to obtain an in-band insulating cylinder;
2) Manufacturing an inner-layer low-voltage winding: winding an inner-layer low-voltage winding on the periphery of the inner insulating cylinder in the step 1), wrapping a layer of glue-dispensing insulating paper on the periphery of the coil after winding a first layer of coil, coating a gel-like epoxy resin layer at the position of the electromagnetic wire transposition if a plurality of wires are wound, and repeating the step until the inner-layer low-voltage winding reaches a set layer of turns;
3) Manufacturing a main empty channel: winding a main channel at the periphery of the inner-layer low-voltage winding in the step 2), wherein a layer of main channel weftless glass fiber mesh cloth with the thickness of 0.5mm and gel-like epoxy resin are uniformly coated outside the main channel; the main empty passage is made of high-density paperboard stay curtains;
4) Manufacturing an outer-layer high-voltage winding: winding an outer-layer high-voltage winding on the periphery of the main air channel in the step 3), winding a first layer, then coating a layer of glue dispensing paper with a specified number, repeating the step until the outer-layer winding reaches the number of turns of a design layer, coating a layer of weftless glass fiber mesh cloth with the thickness of 0.5mm on the outermost layer, and uniformly coating the gel epoxy resin;
5) After the coil is wound, coating gel epoxy resin on the upper and lower ends of the outer-layer high-voltage winding and the inner-layer low-voltage winding; fully immerging into the gap of the high-low voltage winding to form the epoxy resin end sealing effect;
6) After finishing the shaping of the transformer winding, moving the transformer winding into a drying room to heat the transformer winding to a specified temperature until the gel-like epoxy resin is cured; when the transformer is subjected to external short-circuit large-current electromagnetic force, the internal and external short-circuit forces can be mutually counteracted, so that the overall short-circuit resistance of the internal and external windings is greatly improved.
The method for producing the gel-like epoxy resin used above: mixing pure epoxy resin, a curing agent and an accelerator according to the weight ratio of 1:0.2, heating to 70-80 ℃, stirring, fully mixing uniformly, performing vacuum degassing to ensure that no bubble exists in the gel-like epoxy resin, ensuring that the temperature is not lower than 60 ℃ when the gel-like epoxy resin is used, and performing a curing and warming process after the coil is coated and shaped: the oven temperature is 130 ℃ plus or minus 5, and the time is not less than 4 hours, so that the highest strength is achieved.
As shown in fig. 2-3, the short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer manufactured by the method of the present invention comprises a coil and a three-dimensional triangular wound core 11 matched with the coil, wherein the coil sequentially comprises an inner insulating cylinder 2, an inner low-voltage winding 4, a main air channel 6 and an outer high-voltage winding 8 from inside to outside; this wire winding mould 1 of iron core 11 of implementing wraps up the thick high density insulating board of one deck 1mm, and the outer even coating of this insulating board has the epoxy of gel state, wraps up the fine net 3 of weftless glass that one deck 0.5mm is thick again and flattens, obtains taking a high strength compound interior insulation cylinder 2.
The inner low-voltage coil 4 is wound on the outer side of the inner insulating cylinder 2, after the first layer of coil is wound, a layer of glue dispensing insulating paper 5 is coated on the periphery of the coil, if a plurality of wires are wound, a gel-like epoxy resin layer is coated outside the transposition of the electromagnetic wires, and the steps are repeated until the inner low-voltage coil reaches the set number of turns, so that the electromagnetic wires are prevented from shifting under the action of large current.
The outermost surface of the outer high-voltage winding 8 is coated with a high-voltage outer weftless glass fiber grid cloth 9 with the thickness of 0.5mm and epoxy resin in a gel state.
Be equipped with main air passage 6 between inlayer low voltage winding 4 and outer high voltage winding 8, main air passage 6 adopts high density cardboard stay curtain, and high density cardboard stay curtain periphery wraps the main air passage weftless glass fiber net check cloth 7 that a week is 0.5mm thick again and the even coating has the epoxy of gel state.
After the winding of the high-low voltage coil is finished, the upper end and the lower end of the high-low voltage winding are insulated 10 and coated with gel-like epoxy resin, and the gel-like epoxy resin is fully immersed in gaps of the high-low voltage winding to form an epoxy resin end sealing effect.
The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts based on the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (6)
1. A manufacturing method of an anti-short-circuit three-dimensional triangular wound core oil-immersed transformer is characterized by comprising the following steps:
1) Manufacturing an inner insulating cylinder: wrapping a high-density insulating paper board on a winding die, uniformly coating gel epoxy resin outside the high-density insulating paper board, wrapping a weftless glass fiber gridding cloth and flattening to obtain an in-band insulating cylinder;
2) Manufacturing an inner-layer low-voltage winding: winding an inner-layer low-voltage winding on the periphery of the inner insulating cylinder in the step 1), wrapping a layer of glue-dispensing insulating paper on the periphery of the coil after winding a first layer of coil, coating a gel-like epoxy resin layer at the position of the electromagnetic wire transposition if a plurality of wires are wound, and repeating the step until the inner-layer low-voltage winding reaches a set layer of turns;
3) Manufacturing a main empty channel: winding a main empty passage at the periphery of the inner-layer low-voltage winding in the step 2), wherein a layer of main empty passage non-weft glass fiber mesh cloth is coated outside the main empty passage and is uniformly coated with gel-like epoxy resin;
4) Manufacturing an outer-layer high-voltage winding: winding an outer-layer high-voltage winding on the periphery of the main air channel in the step 3), winding a first-layer coil, then coating a layer of glue dispensing paper with a specified number, repeating the step until the outer-layer winding reaches the number of turns of a design layer, coating a layer of weftless glass fiber mesh cloth on the outermost layer, and uniformly coating the gel epoxy resin on the outermost layer;
5) After the coil is wound, coating gel epoxy resin on the upper and lower ends of the outer-layer high-voltage winding and the inner-layer low-voltage winding;
6) After finishing the shaping of the transformer winding, moving the transformer winding into a drying room to heat the transformer winding to a specified temperature until the gel-like epoxy resin is cured.
2. The manufacturing method of the short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer according to claim 1, wherein the thickness of the high-density insulating paperboard in the step 1) is 1mm, and the thickness of the weftless fiberglass mesh fabric is 0.5mm.
3. The manufacturing method of the short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer according to claim 1, wherein the thickness of the main empty channel weftless fiberglass mesh cloth in step 3) is 0.5mm.
4. The manufacturing method of the short-circuit-resistant stereoscopic triangular wound core oil-immersed transformer according to claim 1, wherein the main air channel in step 3) is made of high-density paperboard supporting strips.
5. The manufacturing method of the short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer according to claim 1, wherein the thickness of the weftless fiberglass mesh cloth in the step 4) is 0.5mm.
6. The manufacturing method of the short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer according to claim 1, wherein the gel-like epoxy resin is prepared by mixing pure epoxy resin, a curing agent and an accelerator according to a weight ratio of 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211556212.9A CN115621039A (en) | 2022-12-06 | 2022-12-06 | Manufacturing method of short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211556212.9A CN115621039A (en) | 2022-12-06 | 2022-12-06 | Manufacturing method of short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer |
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| CN115621039A true CN115621039A (en) | 2023-01-17 |
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| CN202211556212.9A Pending CN115621039A (en) | 2022-12-06 | 2022-12-06 | Manufacturing method of short-circuit-resistant three-dimensional triangular wound core oil-immersed transformer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692408A (en) * | 2009-09-21 | 2010-04-07 | 保定天威集团有限公司 | Method for hybrid major insulation of oil immersed transformer |
| CN104616867A (en) * | 2015-02-12 | 2015-05-13 | 扬州华鼎电器有限公司 | Energy-saving totally-sealed type high-overload oil-immersed distribution transformer |
| CN105047383A (en) * | 2015-08-20 | 2015-11-11 | 王永法 | Anti-short circuit oil-immersed transformer body and fabrication method thereof |
| CN105097234A (en) * | 2015-08-13 | 2015-11-25 | 王永法 | Anti-short-circuit amorphous-alloy oil-immersed transformer and preparation method thereof |
| CN105304291A (en) * | 2014-07-18 | 2016-02-03 | 扬州华鼎电器有限公司 | Foil winding dry type transformer and production method thereof |
-
2022
- 2022-12-06 CN CN202211556212.9A patent/CN115621039A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692408A (en) * | 2009-09-21 | 2010-04-07 | 保定天威集团有限公司 | Method for hybrid major insulation of oil immersed transformer |
| CN105304291A (en) * | 2014-07-18 | 2016-02-03 | 扬州华鼎电器有限公司 | Foil winding dry type transformer and production method thereof |
| CN104616867A (en) * | 2015-02-12 | 2015-05-13 | 扬州华鼎电器有限公司 | Energy-saving totally-sealed type high-overload oil-immersed distribution transformer |
| CN105097234A (en) * | 2015-08-13 | 2015-11-25 | 王永法 | Anti-short-circuit amorphous-alloy oil-immersed transformer and preparation method thereof |
| CN105047383A (en) * | 2015-08-20 | 2015-11-11 | 王永法 | Anti-short circuit oil-immersed transformer body and fabrication method thereof |
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