CN1042867C - Transformer coil and its manufacturing method - Google Patents
Transformer coil and its manufacturing method Download PDFInfo
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- CN1042867C CN1042867C CN96104239A CN96104239A CN1042867C CN 1042867 C CN1042867 C CN 1042867C CN 96104239 A CN96104239 A CN 96104239A CN 96104239 A CN96104239 A CN 96104239A CN 1042867 C CN1042867 C CN 1042867C
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Abstract
To provide a dry-type transformer winding which is excellent in workability and improved in productivity by a method wherein an element wire peripheral insulating layer formed on the outer periphery of a conductor insulating coating layer is set so as to be thicker in the direction of winding lamination than in the widthwise direction of a winding wire. The outer surface of a conductor 1 is covered with a thin insulating coating layer 2 for the formation of an element wire, and an element wire peripheral insulating layer 3 is formed on it. The peripheral insulating layer 3 is formed of prepreg insulating material. At this point, provided that the thicknesses of the peripheral insulating layer 3 are represented by &alpha 1 and &alpha 2 , and the crosswise thicknesses of the layer 3 are represented by &beta 1 , and &beta 2 , the insulating layer 3 is formed so as to satisfy a formula, (&alpha 1 &ap &alpha 2 )>(&beta 1 &ap &beta 2 ). By this setup, an interlayer insulating paper which is usually interposed between every two winding laminations can be dispensed with, and a resin impregnating operation can be also dispensed with.
Description
The present invention relates to dry-type transformer and its manufacture method, particularly the improvement technology of the coiled wire-wound coil of dry-type transformer.
Figure 17 is the sectional drawing of the coiled wire-wound coil of prior art, as shown in the figure; the coil of dry-type transformer is in order to improve insulating properties and moisture-proof, dust fastness; further will conductor 1 sequential volume of insulating barrier 2 formations be arranged around constituting band wound coil in surface coverage by layer insulation paper 6; both made between the coil of wire mutually and isolated, and protected coil surface again, open on the clear 60-121620 communique in the reality of the open communique of utility model of Japan and showed the coil that is wound into.
Opening disclosed on clear 59-143020 number in the reality of the open communique of the utility model of Japan is the megohmite insulant of coated porous property on conductor.
In prior art shown in Figure 17, in the process of making the dry-type transformer coiled wire-wound coil,, so there is the low problem of productivity ratio because the operation of insulating paper 6 and the operation that is accompanied by impregnating resin need for a long time between insert layer.
Have again, open on the clear 59-143020 communique in the invention disclosed in above-mentioned reality, because insulating barrier is porous, therefore if resin impregnation is insufficient, the possibility that then has generation bubble (Pinhole) that dielectric strength is descended.
Purpose of the present invention is exactly to be provided in the coiled wire-wound coil making of dry-type transformer, can make the operation excellence, the effective and high-quality dry-type transformer coiling technology that productivity ratio improves.
To achieve these goals, in the present invention, energy is crossed the periphery insulating barrier that is equivalent to layer insulation paper in the arranged outside of the insulating coating of the conductor that forms with electric conducting material (following claims conductor), abrogate layer insulation paper, in addition, because this periphery insulating barrier forms with the pre-soaked resin insulating material, thereby after the conductor coiling of having insulated, heat-treat, just can make to reach coil surface between single cord and fix.Promptly, the present invention is wound into coil that tubular forms forms multilayer on the radial direction of this tubular transformer coil with conductor, has the 1st insulating barrier that on the axial surface of the above-mentioned tubular of conductor, forms, with the 2nd insulating barrier that forms on the surface of the stack direction of the above-mentioned coil of above-mentioned conductor, the thickness of above-mentioned the 2nd insulating barrier is also thicker than the thickness of above-mentioned the 1st insulating barrier.Have again, the method of making transformer coil has the step of the insulating coating that forms the insulation coating conductor on the periphery of above-mentioned conductor, with the coil and the periphery insulating barrier that have formed above-mentioned insulating coating are piled up the step that is wound into tubular, and make the thickness of the insulating barrier that forms on than axial surface at the thickness of insulating layer that forms on the surface of the stack direction of the above-mentioned coil of above-mentioned conductor thick in the above-mentioned tubular of above-mentioned conductor.
Dry-type transformer coiled wire-wound coil of the present invention can omit the operation of operation of insulating paper between insert layer and impregnating resin, when boosting productivity, can reduce the energy consumption that is used to produce and the use amount of material.But the pre-soaked resin insulating material for example is to resemble the epoxy resin self hot sticky resin material, owing to its after-hardening melt once in heating, thereby after coiling, does not need to inject the mechanical strength that resin just can form insulating barrier and maintenance coiled wire-wound coil.In the present invention, use is formed with the single cord of the 1st insulating barrier and the 2nd insulating barrier in the surface of conductors with cast section or rectangular cross section, because the 2nd insulating barrier comprises the pre-soaked resin insulating material, so the pre-soaked resin insulating material is through heat treatment just fixedly between the single cord and coil surface, thereby can obtain insulating properties, moisture-proof, dry-type transformer coil that dust fastness is good.Figure 16 is an oblique view of showing the outward appearance of the dry-type transformer that is made into single cord of the present invention.
Fig. 1 is a bundle conductor sectional drawing of showing the embodiment 1 of relevant dry-type transformer coil of the present invention.
Fig. 2 is a sectional drawing of showing the coiled wire-wound coil of the single cord that has used embodiment shown in Figure 11.
Fig. 3 is a single cord sectional drawing of showing the embodiment 2 of dry-type transformer coil of the present invention.
Fig. 4 is a single cord sectional drawing of showing the embodiment 3 of dry-type transformer coil of the present invention.
Fig. 5 is a single cord sectional drawing of showing the embodiment 4 of dry-type transformer coil of the present invention.
Fig. 6 is a single cord sectional drawing of showing the embodiment 5 of dry-type transformer coil of the present invention.
Fig. 7 has been to use the sectional drawing of coil of single cord of the embodiment 6 of dry-type transformer coil of the present invention.
Fig. 8 is the interlayer potential image of the coil structure in the technology that formerly has.
Fig. 9 is the interlayer potential image that does not use the formation of interlayer paper.
Figure 10 is that the interlayer at coil has the ideograph under the situation of space.
Figure 11 is the figure of embodiment of manufacturing installation that shows the conductor single cord of embodiment 6 shown in Figure 7.
Figure 12 is the figure of embodiment of Winder that show to make the coil structure of embodiment 3 shown in Figure 5.
Figure 13 is the figure of embodiment of Winder that show to make the coil structure of embodiment 5 shown in Figure 6.
Figure 14 shows the Winder of making coil shown in Figure 7.
Figure 15 is the figure that shows an example of the coil that is formed by single cord of the present invention.
Figure 16 is the oblique view of showing with the outside drawing of the thread dry-type transformer of sub-thread of the present invention.
Figure 17 is the sectional drawing of the coiled wire-wound coil of prior art.
Below, with Fig. 1, Fig. 2 embodiments of the invention 1 are described.
Fig. 1 is the bundle conductor sectional drawing of the embodiment 1 of relevant dry-type transformer coil of the present invention, and Fig. 2 is the figure of section that shows the coiled wire-wound coil of the single cord that has used embodiment 1.The periphery of conductor 1 coats the formation single cord with thin insulating coating 2 becomes the structure that forms single cord periphery insulating barrier 3 in its periphery.The material of this periphery insulating barrier 3 preferably uses pre-soaked resin insulating material or imporosity insulating material.In Fig. 2, under the situation of the relation that illustrates potential difference maintenance Δ V1＞Δ V2 ≈ Δ V3 partly, if establish the thickness of the lamination direction of periphery insulating barrier 3 in Fig. 1 is α 1, α 2, if the thickness of the coiling direction of coil is β 1, β 2, then resemble the periphery insulating barrier 3 the relation of formation (α 1 ≈ α 2)＞(β 1=β 2).But, α is also arranged in other embodiments
1＞α
2≈ β
1≈ β
2Or α
2＞α
1≈ β
1=2 situation.
In transformer, usually, the potential difference between the adjacent conductor of stack direction is higher than the potential difference between the adjacent conductor of the coiling direction of coil.Thereby, in order to use insulating material expeditiously, reduce the volume of transformer as much as possible, need make the thickness of insulating barrier thicker than coil coiling direction at stack direction.
Fig. 3 is the sectional drawing of single cord of showing the embodiment 3 of dry-type transformer coil of the present invention, and it is the example of circular single cord that embodiment 2 is to use section.Identical with embodiment 1, form the suitable thickness of thickness of the layer insulation paper 6 (Figure 17) that has and have earlier by periphery insulating barrier 3 with the winding stack direction, just can replace layer insulation paper 6 to keep desired insulation property, become possibility thereby abrogate layer insulation paper 6.The material of periphery insulating barrier 3 is the imporosity insulation film preferably.
Embodiment 3 and embodiment 4
Fig. 4 is the single cord sectional drawing of the embodiment 3 of dry-type transformer coil of the present invention, and Fig. 5 similarly is the single cord face figure that shows embodiment 4.With Fig. 1 and Fig. 3 similarly in order on the stack direction of periphery insulating barrier 3 and fabric width direction, to form difference in size, fixed insulation girth member 7 on the two sides of the stack direction of the conductor 1 that is coated with insulating coating 2.Material as insulation girth member 7, PA (polyamide), PEN (PEN), PI (polyimides), PEI (polyimide), PPS (poly-p-phenylene sulfide), PET (dimethyl ester), pre-soaked resin insulating material etc. are fit to, preferably the low megohmite insulant of permittivity.Shown in the embodiment 4 of Fig. 5, even, also can satisfy the layer insulation performance only at a fixed insulation girth member 7 of stack direction.
Embodiment 5
Also direct fixed insulation girth member 7 on conductor 1 forms single cord insulating coating 2 in its outside as shown in Figure 6.At this moment,,, then behind coiling conductor 1, only heat-treat, just can fix mutual single cord and coil surface if use the pre-soaked resin insulating material as insulating coating material 7.The resin of pre-soaked resin material 7 is immersed in sclerosis in the coating layer 2.
As the material of insulating coating 2, if use the insulation film of the densification of the imporosity as PEN or PET, then owing to being that permeability makes dielectric strength become very high.But, under the sort of situation, can not use the pre-soaked resin material as insulating coating material 7.Under the sort of situation, in advance under semi-harden state the coated heat hardening resin in the surface of the film of PEN or PET as the material of insulating coating, then, twine on insulating coating material 7 and lead 1 with the film of insulating coating 2.
Embodiment 6
Fig. 7 is to use the sectional drawing of coil of single cord of the embodiment 6 of dry-type transformer of the present invention coiling.In order to increase the insulation thickness of coil lamination direction, use the single cord insulating coating 8 that has projection to be coated on the conductor 1 in advance with projection 8a.When winding operation, whenever around one deck the time,, fill between adjacent the projection 8a and projection 8a, thereby guarantee insulating properties by the lacquer 9 of short time constrictive type.This embodiment also can expect the effect not using interlayer paper, do not use resin injection type.Insulating coating 8 is imporosity insulating material.
Fig. 8 is the moderate interlayer potential image of coiling structure that skill dress is arranged earlier at Figure 17, and Fig. 9 is without the interlayer potential image in the structure of interlayer paper.Be to show that the analysis of all carrying out electric field strength and affirmation have or not the result's that electric field concentrates figure, still, single cord insulating coating 2 and layer insulation paper 6 use the polyamide adhesive-bonded fabric, in the coiling that has earlier structure shown in Figure 8, if conductor coating layer 2 is 0.05mm * 2, layer insulation low 6 is 0.13 * 3, in addition, under the situation of not using layer insulation paper, conductor coating layer 2 is made as 0.05mm * 5 calculating.Fig. 8 is that the potential difference of establishing interlayer is 100%, and per 7.7% describes the equipotential curve, in Fig. 9 is per 10% to describe the equipotential curve.If compare as can be known with Fig. 8, the place that Fig. 9 does not have electric field to concentrate does not especially have big problem even do not use interlayer to hang down yet.
Determine concrete coating film thickness corresponding to the material of insulant below.In general, the insulation thickness between the conductor of coil is by the characteristic decision of the dielectric voltage withstand of material etc.And the space of establishing coil interlayer on the other hand is 0 to be difficult.Therefore, be easy to generate the partial discharge phenomenon that causes by the space.If generation partial discharge then insulating material has because of the danger of corona discharge quality decline until insulation breakdown.Therefore, be the insulation thickness of lamination direction for coil interlayer, just must make and not produce the such thickness of partial discharge.
Make in reality under the situation of transformer coil, between the insulating barrier of adjacent as shown in Figure 2 conductor, can not be provided with gap (space).In the finished product coil of reality, the variation of the thickness of bent lead and the density of method for winding etc., it is very common having the space between adjacent insulating barrier.
Electric discharge phenomena in this space do not take place because of potential difference is little between with the coil in one deck, and take place between the coil of interlayer.The interlayer potential difference is increased gradually, the space share voltage if surpass the discharge voltage in this space, then begin partial discharge.This is as the composite dielectrics in solid dielectric and space, can obtain from the relation of the discharge voltage of sharing voltage and this space in space.
Figure 10 is that the interlayer portion at coil has the ideograph under the situation in space.In Figure 10, when between electrode, having applied voltage V0, above-mentioned space share voltage Va and dielectric voltage Vs that shares uses (1) formula and (2) formula to represent respectively.
Wherein, Vo: inter-electrode voltage da: the space is long
Va: the space share voltage ds: dielectric thickness
Vs: dielectric voltage of sharing
ε
a: the permittivity in space
ε
ν: dielectric permittivity
If coil interlayer produces high potential, then because compare the permittivity in space with the permittivity of the clad material of interlayer little, and then, thereby, then at first destroy the insulation of gap if voltage between layers progressively rises because the insulation breakdown voltage of air is compared lowly with dielectric disintegration voltage.Thereby partial discharge begins the voltage that voltage is shared as the space, is tried to achieve by (1) formula.If the electric permittivity epsilon of establishing air
a=1, then inter-electrode voltage Vo can represent with (3) formula.
At this, the corona of establishing interlayer begins voltage V
0Be rated voltage V
0' 1.5 times, the length d a in space is changed, will be in atmospheric discharge voltage Va substitution (3) formula of that (Paschen ＇ sCurve) curve of handkerchief of this da if obtain electric permittivity epsilon
sThe thickness of insulant, then big in the long da in certain space place insulation thickness amount of becoming, this value is made as and voltage between layers V
0' relative electric permittivity epsilon
sCorresponding layer thickness.Layer thickness hereinafter referred to as various insulating material.
In the interlayer rated voltage is under the situation of 700V, if the pre-soaked resin base is an insulating material, and t=0.19mm then, if PET is an insulating material, t=0.13mm then, if PEN is an insulating material, t=0.12mm then.In voltage between layers is under the situation of 300V, if the pre-soaked resin base is an insulating material, and t=0.06mm then, if PET is an insulating material, t=0.04mm then, if PEN is an insulating material, t=0.04mm then.On the other hand, the thickness that is configured in the insulating barrier between neighbouring coil is tried to achieve by the insulation breakdown voltage of various materials.In fact owing to only produce minimum current potential between last lower coil, so insulation thickness is considered manufacture method and cost, it is very suitable selecting 0.01～0.05mm.
Figure 11 shows coiled wire-wound coil shown in Figure 7 figure with the embodiment of the manufacturing installation of single cord.Figure 11 is exactly a general manufacture method of utilizing enamelled wire, coats insulation (enamel) coating by the multiple operation of returning of coating → baking → coating on conductor.Finish department is collected unnecessary coating after conductor 1 is by the coatings liquid tank to make coating be suitable thickness.The lacquer that particularly viscosity is high uses metal pattern 13 to collect.As shown in Figure 7,, on metal pattern 13, form the recess suitable, just can realize by stretch forming with projection 8a in order on the insulating bag clad can of conductor 1, to form projection 8a.
Below, the method that conductor 1 single cord narrate of letter winds the line before illustrating with Figure 12, Figure 13, Figure 14.Figure 12 is the figure of the Winder of exploded view 4 and single cord shown in Figure 5.Before coiling conductor 1 on the bobbin 17, the insulation girth member 7 that mixes tubular is bonded together with conductor 1 up and down from the stack direction of conductor 1 and together reels.Under the situation of the sub-thread single line of Fig. 6, as shown in figure 13, after the insulation girth member 7 of cylinder shape combined with conductor 1 up and down from stack direction, by single cord insulating coating 2 conductor 1 and insulation girth member 7 are being twined and to wrap the formation thing of these conductors 1 of on bobbin 17, reeling.Figure 14 is the figure that shows the Winder of coiled wire-wound coil shown in Figure 7.When coiling, behind every coiling one deck, with pump 19 dope 9 on the whole periphery of coil.Lacquer 9 is filled by ditch portion between projection 8a and projection 8a, forms firm interlayer insulating film.Be coated on the device 18 of the lacquer of interlayer, just can harden in the short time by ultraviolet irradiation, infrared radiation and heat treated etc.If particularly use and do not produce the paint material that fault is hardened at short notice when winding operation, the projection 8a that then is not provided with as shown in Figure 7 also can make the insulating coating consistency of thickness guarantee interlayer insulating film.And then, form single cord insulating coating 2 if use from hot melt lacquer, only be used in then that heat-treat after the coiling just can fixed coil.
One embodiment of the section of the coiled wire-wound coil that forms by conductor single cord and winding operation more than Fig. 2 has showed, but after the ground floor coiling finished, the U-shaped coiling overhang that revolution is turned back with regard to the former state U-shaped was to produce the voltage between layers the best part.Because the dielectric strength of this part is poor, therefore, if as shown in Figure 15, folding 20 wrapped shapes of interlayer insulating film projection is set on the coil end face, the beeline that then can add the edge of 1 of long conductor and discharge, thus the dielectric strength corresponding can be increased with high potential.This conductor single line also can be coated with method by the lacquer that uses the such die for special purpose of metal pattern 13 in Figure 11 and form.Interlayer insulating film 2 is made by the atresia insulating material.
Figure 16 is used in the transformer outward appearance oblique view that the coil in the various embodiments described above forms.The coil of present embodiment does not need the resin injection molding operation of resin etc. after coiling finishes, owing to be by fixing from thermal welding between coil, form the coil striped on the coil circumferencial direction.
Pass through the invention process, in the manufacturing process of dry-type transformer coil, can give up the layer insulation paper that in each lamination of in the past coil, inserts, in addition, by single cord periphery insulating barrier is not become the pre-soaked resin material, just can only heat-treat and make between single cord and coil surface is fixed, can abrogate the resin impregnation operation, can seek to improve operation, reduce fee of material, energy cost, can obtain making the remarkable result of dry-type transformer coiled wire-wound coil etc. with low cost.
Claims (8)
1. transformer coil, it is to be wound into the coil transformer coil that stacked multilayer forms on this radial direction that tubular constitutes by conductor, it is characterized in that:
Have the above-mentioned tubular that is formed on above-mentioned conductor axial lip-deep the 1st insulating barrier, be formed at lip-deep the 2nd insulating barrier of stacked direction of the above-mentioned coil of above-mentioned conductor, the thickness of above-mentioned the 2nd insulating barrier forms thicker than the thickness of above-mentioned the 1st insulating barrier.
2. the described transformer coil of claim 1 is characterized in that:
Above-mentioned the 1st insulating barrier and above-mentioned the 2nd insulating barrier comprise that all insulating bag is covered with the insulating coating of stating conductor and is formed at the periphery insulating barrier of this insulating coating periphery.
3. the described transformer coil of claim 1 is characterized in that:
Above-mentioned the 1st insulating barrier still is that above-mentioned the 2nd insulating barrier comprises that all insulating bag is covered with the insulating coating of stating conductor, and above-mentioned the 2nd insulating barrier comprises the periphery insulating barrier of the periphery that is formed at this insulating coating.
4. claim 2 or 3 described transformer coils is characterized in that:
Above-mentioned periphery insulating barrier forms with pre-soaked resin base (Prepreg) insulating material, be used in aforementioned dielectric coating layer two sided coatings the imporosity PEN (polyethylennaphthalate) or the dimethyl ester (polyethylenterephthalate) of resin form.
5. the described transformer coil of claim 1 is characterized in that:
Above-mentioned the 2nd insulating barrier has in its surface the jut to above-mentioned stacked direction projection.
6. the described transformer coil of claim 1 is characterized in that:
Above-mentioned the 1st insulating barrier is formed with folding in its surface.
7. method of making transformer, it is to make the method for transformer coil be wound into coil stacked multilayer on the radial direction of above-mentioned tubular that tubular constitutes by conductor,
It is characterized in that:
Have and insulating bag is covered with the insulating coating of stating conductor is formed on step on the periphery of above-mentioned conductor, be wound into the step of tubular with the coil that has overlapped to form above-mentioned insulating coating and periphery insulating barrier, the thickness of insulating layer that forms on the thickness of the insulating barrier that forms on the surface of the stacked direction of the above-mentioned coil of above-mentioned conductor is arranged to than the surface at the axis direction of the above-mentioned tubular of above-mentioned conductor is thick.
8. the method for the described manufacturing transformer coil of claim 7 is characterized in that:
Periphery formation insulating bag at above-mentioned conductor is covered with the insulating coating of stating conductor on one side, and one side overlapping above-mentioned periphery insulating barrier between above-mentioned insulating coating and above-mentioned conductive surface is wound into tubular simultaneously.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7060817A JPH08264349A (en) | 1995-03-20 | 1995-03-20 | Dry-type transformer winding |
| JP060817/95 | 1995-03-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1138205A CN1138205A (en) | 1996-12-18 |
| CN1042867C true CN1042867C (en) | 1999-04-07 |
Family
ID=13153292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96104239A Expired - Fee Related CN1042867C (en) | 1995-03-20 | 1996-03-19 | Transformer coil and its manufacturing method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH08264349A (en) |
| CN (1) | CN1042867C (en) |
| TW (2) | TW346237U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102782773A (en) * | 2010-10-01 | 2012-11-14 | 古河电气工业株式会社 | Insulated wire |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010267768A (en) * | 2009-05-14 | 2010-11-25 | Denso Corp | Reactor |
| JP2012033386A (en) * | 2010-07-30 | 2012-02-16 | Nec Tokin Corp | Electric wire, winding wire and electric component |
| CN103354173A (en) * | 2013-07-30 | 2013-10-16 | 江苏亨特集团华特电气有限公司 | Winding method of multi-layer cylindrical coil of transformer |
| CN103500647B (en) * | 2013-10-28 | 2015-10-21 | 武汉大学 | A kind of manufacture method of coil |
| CN103594156B (en) * | 2013-11-18 | 2016-03-23 | 保定天威线材制造有限公司 | A kind of production method of transformer PET polyester film insulated combied conductor |
| CN106377019A (en) * | 2015-07-31 | 2017-02-08 | Ykk株式会社 | Film forming device, zipper teeth chain belt manufacture method, and zipper teeth chain belt |
| CN106449078A (en) * | 2016-08-31 | 2017-02-22 | 芜湖金牛电气股份有限公司 | Winding method of transformer coil |
| US10340074B2 (en) | 2016-12-02 | 2019-07-02 | Cyntec Co., Ltd. | Transformer |
| JP7184063B2 (en) * | 2020-03-30 | 2022-12-06 | 株式会社村田製作所 | Coil component and its manufacturing method |
| JP2021174800A (en) * | 2020-04-20 | 2021-11-01 | Tdk株式会社 | Coil component |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57138114A (en) * | 1981-02-20 | 1982-08-26 | Hitachi Ltd | Winding for transformer |
| CN2071824U (en) * | 1990-06-08 | 1991-02-20 | 沈阳变压器厂 | Insulation structure of high-voltage winding layer for voltage mutual-inductor |
| CN1025524C (en) * | 1989-08-18 | 1994-07-20 | 株式会社日立制作所 | Electric insulated coil, rotary electric machine, and method of manufacturing for coil |
-
1995
- 1995-03-20 JP JP7060817A patent/JPH08264349A/en active Pending
-
1996
- 1996-03-18 TW TW086203741U patent/TW346237U/en unknown
- 1996-03-18 TW TW85103211A patent/TW318246B/zh active
- 1996-03-19 CN CN96104239A patent/CN1042867C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57138114A (en) * | 1981-02-20 | 1982-08-26 | Hitachi Ltd | Winding for transformer |
| CN1025524C (en) * | 1989-08-18 | 1994-07-20 | 株式会社日立制作所 | Electric insulated coil, rotary electric machine, and method of manufacturing for coil |
| CN2071824U (en) * | 1990-06-08 | 1991-02-20 | 沈阳变压器厂 | Insulation structure of high-voltage winding layer for voltage mutual-inductor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102782773A (en) * | 2010-10-01 | 2012-11-14 | 古河电气工业株式会社 | Insulated wire |
| CN102782773B (en) * | 2010-10-01 | 2015-12-02 | 古河电气工业株式会社 | Insulated electric conductor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08264349A (en) | 1996-10-11 |
| TW346237U (en) | 1998-11-21 |
| TW318246B (en) | 1997-10-21 |
| CN1138205A (en) | 1996-12-18 |
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