CN100407344C - Foil type coil of power transformer and its manufacturing method - Google Patents
Foil type coil of power transformer and its manufacturing method Download PDFInfo
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- CN100407344C CN100407344C CN2005101307855A CN200510130785A CN100407344C CN 100407344 C CN100407344 C CN 100407344C CN 2005101307855 A CN2005101307855 A CN 2005101307855A CN 200510130785 A CN200510130785 A CN 200510130785A CN 100407344 C CN100407344 C CN 100407344C
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Abstract
The present invention relates to a foil coil of an electric power transformer. The outer side of a first layer of copper or aluminium foil [30] is provided with a first layer of insulation material [40], the outer side of the first layer of insulation material [40] is provided with a second layer of copper or aluminium foil [30], the outer side of the second layer of copper or aluminium foil [30] is provided with a second layer of insulation material [40], the operation is implemented by parity of reasoning, and a coil brim is composed of inclined edges at the upper and the lower end of each layer of copper or aluminium foil [30] and the insulation material [40]. The making method of the foil coil is that firstly, once one layer of foil material [30] is wound, one layer or a plurality of layers of insulation material [40] are wound, after the coil is wound, the coil is cast by epoxy resin, and the upper and the lower sides of the coil are respectively cut so as to form the coil brim [50]; secondly, a bar-shaped copper or aluminium foil belt which is gradually narrowed in width is stuck with an insulation belt with the same shape as the bar-shaped copper or aluminium foil belt to be wound so as to form the coil brim 50 of which the upper and the lower end faces are inclined from inside to outside; thirdly, a plurality of kinds of foil of different thicknesses are orderly wound, following the increase of coil diameter, copper foil or aluminium foil is from thin to thick and from wide to narrow for stepwise transition and thus the coil brim 50 of which the upper and the lower end faces are inclined from inside to outside is formed.
Description
Technical field
The present invention relates to foil coil of power transformer and preparation method thereof.
Background technology
At present, no matter be oil-filled transformer, dry-type transformer, SF6 class gas-insulated transformer, vapour-cooled transformer or other transformer, its coil is if adopt foil coil, then each circle height of foil coil, thickness are all consistent, each coil section is rectangle, this makes that the Electric Field Distribution of transformer is not ideal enough, and foil coil is difficult to direct use on the higher power transformer of rated voltage.
Famous ABB AB adopts RIP technology (Resin Impregnated Paper) to make the sleeve pipe of transformer, i.e. coiling one deck insulating material around the cable, coiling one deck aluminium foil (or Copper Foil) again, after finishing, the lamination coiling under vacuum environment, carries out resin-cast, behind the cast cured explosive its upper and lower side is sheared, sleeve pipe fuse peripheral hardware after shearing is put insulator, adopts solid packing to fill between insulator and the sleeve pipe fuse.At present, using the grade of rated voltage that the RIP sleeve pipe of this technology reaches is 550kV, and successfully obtains commercial Application in large quantities.But, do not see as yet the RIP technology be applied on one's body the device of transformer.
Summary of the invention
For overcoming the deficiency of existing transformer aspect above-mentioned, further improve the electric pressure of transformer, the present invention proposes a kind of transformer coil and preparation method thereof, the present invention can bring up to 550kV with the transformer grade of rated voltage.
Low voltage winding in transformers of the present invention is conventional coil (cake formula, laminar or a paper tinsel formula), and the low-voltage coil outside is a high-tension coil.High-tension coil is a foil coil.Ground floor Copper Foil (or aluminium foil) outside of high-tension coil is the ground floor insulating material, the ground floor insulating material outside is second layer Copper Foil (or aluminium foil), second layer Copper Foil (or aluminium foil) outside is a second layer insulating material, by that analogy, the hypotenuse of the upper and lower side of each layer Copper Foil (or aluminium foil) and insulating material constitutes coil edge.For improving the grade of rated voltage of transformer, improve Electric Field Distribution, the present invention has improved the foil coil cross sectional shape.Be about to Copper Foil (or aluminium foil) and on foil winding equipment, turn to coil, in manufacturing process, with layer insulation simultaneously around going into.Layer insulation can be stationery, aromatic series polyamine lipid film (or mylar), epoxy, phenolic aldehyde, nylon, plastics, rubber-like etc.The coil manufacturing process can have following two kinds of methods: the one, and after finishing, coiling under vacuum environment, carries out poured with epoxy resin, and solidify the back coil two ends are cut, make being shaped as of its cross section trapezoidal or approximate trapezoid and other shape.The benefit of doing like this is to have increased the high-tension coil head end to the distance between the earth potential, no matter be middle part outlet structure (the lead-out wire position that is high-tension coil is on the center line of coil short transverse) or end outlet structure (being upper end or the lower end of the lead-out wire position of high-tension coil), all can improve the dielectric voltage withstand grade in the coil short transverse.The 2nd, (or in winding process) cuts at Width Copper Foil (or aluminium foil) turns to coil on foil winding equipment before.The height of the every circle of coil can be different, and totally presenting with diameter increases and highly more and more littler trend.At this moment, coil can carry out poured with epoxy resin after coiling is finished, also can not pour into a mould.Therefore, on the material selection of foil coil, can adopt three kinds of selections, first: the thickness of whole copper foil (or aluminium foil) is all the same, so just cause its each circle (or each section of coil) sectional area different owing to Copper Foil (or aluminium foil) width is different, the current density of each circle (or each section of coil) is also different.This structural manufacturing process is simple, but must choose suitable current density according to outermost coil section is long-pending when design, thereby causes the waste of coil method.Second:, can make its each circle sectional area reach unanimity like this, thereby each circle current density also reaches unanimity with the Thickness Design of whole copper foil (or aluminium foil) the thin thickening of serving as reasons.Though this structural manufacturing process is complicated, because each circle current density is even substantially, the waste that can not produce coil method.The 3rd: by the coiling of the Copper Foil (or aluminium foil) of different-thickness order, along with the diameter of coil increases, Copper Foil (or aluminium foil) is by thin thickening, narrowed down by wide with coil, also sectional transition, and this structure is between the former two.When carrying out the coil design of transformer, can suitably match as the case may be.
Foil coil of the present invention can be brought up to 550kV with the grade of rated voltage of transformer.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is a specific embodiment of the invention schematic diagram, among the figure: 10 low-voltage coils, 20 high-tension coils, 30 Copper Foils (or aluminium foil), 40 insulating material, 50 trapezoid cross section coil edges, 60 iron cores.
Embodiment
One of specific embodiment of the invention as shown in drawings.
60 outsides unshakable in one's determination are low-voltage coil 10, low-voltage coil 10 is conventional coil (cake formula, laminar or a paper tinsel formula), low-voltage coil 10 outsides are high-tension coils 20, high-tension coil 20 is a foil coil, ground floor Copper Foil (or aluminium foil) 30 outsides of high-tension coil 20 are ground floor insulating material 40, ground floor insulating material 40 outsides are second layer Copper Foils (or aluminium foil) 30, and second layer Copper Foil (or aluminium foil) 30 outsides are second layer insulating material 40, by that analogy.The hypotenuse of the upper and lower side of each layer Copper Foil (or aluminium foil) 30 and insulating material 40 constitutes coil edge 50.
Can use poured with epoxy resin between Copper Foil (or aluminium foil) 30 and the insulating material 40, also can be without poured with epoxy resin.Coil edge 50 can be a straight line, also can be near linear or arbitrary curve, and the coil edge that the present invention is hypotenuse can increase the high-tension coil head end to the distance between the earth potential, to improve the insulation level of transformer.
The concrete technique for coiling of the present invention is: first kind is with wide rectangular paper tinsel band and wide rectangular insulation band coiling together.In winding process, every coiling one deck Copper Foil (or aluminium foil) 30 is with regard to one or more layers insulating material 40 of coiling, after coil winding is finished, to pour into a mould with epoxy resin, the cast back cuts respectively high-tension coil 20 upper and lower sides, the hypotenuse that formation is outward-dipping from the lining, promptly coil edge 50.
Second kind is to be sheared on Width, and the not wide bar shaped paper tinsel band (Copper Foil or aluminium foil) 30 that width narrows down gradually sticks the insulation band 40 of a similar shape, and coiling together directly turns to coil on foil winding equipment.Coil size on short transverse is different, and presents the highly more and more narrow trend with the diameter increase, the coil edge 50 that the formation upper and lower end face tilts from inside to outside.In order to make current density difference between each circle lead little, can adopt the not band coiling of equal thickness, promptly its thickness sticks bar insulation band 40 coiling together by the thin bar shaped paper tinsel band 30 of thickening gradually.The coil of institute's coiled though every layer height outwards reduces gradually from the lining, owing to the thickness increase gradually from inside to outside of Copper Foil or aluminium foil, thereby makes every layer of current density even substantially.
The third is the rectangular insulation band together behind the coiling number layer that a rectangular paper tinsel band that narrows down gradually at the width that has been sheared on the Width is sticked a similar shape, then another piece of coiling is sheared on Width again, the rectangular paper tinsel band that width narrows down gradually and the rectangular insulation band of similar shape (this piece paper tinsel band and more last thickness thickening of insulation band), by that analogy, Copper Foil (or aluminium foil) is by thin thickening, narrowed down by wide, the segmentation transition forms the coil edge 50 that the coil upper and lower end face tilts from inside to outside.
In addition, for low-voltage coil electric pressure also condition with higher, also can adopt this paper tinsel formula structure.
Can leave the slit as the cooling duct in the piecewise between Copper Foil in the above-mentioned execution mode (or aluminium foil) 30 and the insulating material 40, the concrete structure and the size of cooling duct are any, and be different and different according to the type of cooling that transformer adopted.
Above-mentioned execution mode is all applicable for single-phase transformer and three-phase transformer.
Above-mentioned execution mode is all applicable for on-load tap-changing transformer and No-load changer transformer.
Above-mentioned execution mode is all applicable for two-winding transformer and three-winding transformer.
Above-mentioned execution mode is all applicable for the transformer of the various types of cooling.
The present invention has utilized the accurate trapezoid cross section structure of coil or the Insulation Problems that the RIP technology has solved transformer, has improved the electric pressure of transformer, can bring up to rated voltage 550kV.
Claims (2)
1. foil type coil of power transformer is characterized in that: the upper and lower end parts of foil coil constitutes coil edge (50) with near linear or arbitrary curve, and the cross section of foil coil is a non-rectangular shape; The coil height that Copper Foil or aluminium foil (30) width forms progressively diminishes from coil end to head end, adopts Copper Foil or the aluminium foil that thickens step by step from coil end to the coil head end, perhaps the coil Outboard Sections adopt Copper Foil or aluminium foil multilayer and around mode; The gap is left as the cooling duct in the piecewise between Copper Foil or aluminium foil and the interlayer dielectic.
2. the manufacture method of the described foil type coil of power transformer of claim 1, it is characterized in that first kind is insulating material (40) coiling together that the not wide Copper Foil that progressively narrows down of the width that adopts to have sheared or aluminium foil (30) stick a similar shape on Width, on foil winding equipment, directly turn to coil, form the coil edge (50) that the upper and lower end face tilts from inside to outside; Second kind is to stick the similar insulating material of a strip together behind the coiling number layer with one at Copper Foil that Width has been sheared or aluminium foil, then another piece of coiling is sheared at Width again, width is than the narrow Copper Foil of lastblock or the insulating material of aluminium foil and similar shape, by that analogy, Copper Foil or aluminium foil are by thin thickening, narrowed down by wide, the segmentation transition forms the coil edge (50) that the upper and lower end face tilts from inside to outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101307855A CN100407344C (en) | 2005-12-30 | 2005-12-30 | Foil type coil of power transformer and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101307855A CN100407344C (en) | 2005-12-30 | 2005-12-30 | Foil type coil of power transformer and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1794380A CN1794380A (en) | 2006-06-28 |
| CN100407344C true CN100407344C (en) | 2008-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005101307855A Expired - Fee Related CN100407344C (en) | 2005-12-30 | 2005-12-30 | Foil type coil of power transformer and its manufacturing method |
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| Country | Link |
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| CN (1) | CN100407344C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269266A (en) * | 2014-07-09 | 2015-01-07 | 伊戈尔电气股份有限公司 | Oil-immersed type transformer non-end-insulation low-voltage foil-winding coil manufacturing technology |
| CN105742050A (en) * | 2016-04-27 | 2016-07-06 | 江苏雷特电机股份有限公司 | Foil tape winding device |
| JP2020035855A (en) * | 2018-08-29 | 2020-03-05 | 株式会社村田製作所 | Laminated coil component and manufacturing method of laminated coil component |
| KR102130677B1 (en) | 2019-01-09 | 2020-07-06 | 삼성전기주식회사 | Coil component |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2169191Y (en) * | 1993-09-28 | 1994-06-15 | 毛根善 | Energy-saving foil transformer |
| JP2002093638A (en) * | 2000-09-20 | 2002-03-29 | Kansai Electric Power Co Inc:The | Stationary induction elecrical device |
| CN2731661Y (en) * | 2004-09-23 | 2005-10-05 | 中电电气集团有限公司 | Foil type winding of liquid soaking transformer |
-
2005
- 2005-12-30 CN CN2005101307855A patent/CN100407344C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2169191Y (en) * | 1993-09-28 | 1994-06-15 | 毛根善 | Energy-saving foil transformer |
| JP2002093638A (en) * | 2000-09-20 | 2002-03-29 | Kansai Electric Power Co Inc:The | Stationary induction elecrical device |
| CN2731661Y (en) * | 2004-09-23 | 2005-10-05 | 中电电气集团有限公司 | Foil type winding of liquid soaking transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1794380A (en) | 2006-06-28 |
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