JPH01125913A - Transformator - Google Patents
TransformatorInfo
- Publication number
- JPH01125913A JPH01125913A JP62285825A JP28582587A JPH01125913A JP H01125913 A JPH01125913 A JP H01125913A JP 62285825 A JP62285825 A JP 62285825A JP 28582587 A JP28582587 A JP 28582587A JP H01125913 A JPH01125913 A JP H01125913A
- Authority
- JP
- Japan
- Prior art keywords
- voltage coil
- insulating material
- synthetic resin
- high voltage
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000835 fiber Substances 0.000 claims abstract description 21
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 21
- 239000000057 synthetic resin Substances 0.000 claims abstract description 21
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 239000000919 ceramic Substances 0.000 claims abstract description 15
- 239000011810 insulating material Substances 0.000 abstract description 19
- 239000010410 layer Substances 0.000 abstract description 14
- 238000005470 impregnation Methods 0.000 abstract description 10
- 239000011229 interlayer Substances 0.000 abstract description 9
- 229920005989 resin Polymers 0.000 abstract description 7
- 239000011347 resin Substances 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000001723 curing Methods 0.000 description 7
- 239000012774 insulation material Substances 0.000 description 5
- 239000010445 mica Substances 0.000 description 5
- 229910052618 mica group Inorganic materials 0.000 description 5
- 239000004745 nonwoven fabric Substances 0.000 description 4
- 239000002966 varnish Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 239000012209 synthetic fiber Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 210000003092 coiled body Anatomy 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 210000004709 eyebrow Anatomy 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Insulating Of Coils (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は変成器、特にその耐熱衝撃性、コロナ特性の
改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a transformer, particularly to improvements in its thermal shock resistance and corona characteristics.
［従来の技術］
第４図に従来の変成器として、乾式計器用変圧変流器の
断面図を示す、高圧コイル（１）の各層間には層間絶縁
材料（２）が設けられ、低圧コイル（４）の各層間には
層間絶縁材料（５）が設けられている。[Prior Art] Fig. 4 shows a cross-sectional view of a dry voltage transformer as a conventional transformer. An interlayer insulating material (2) is provided between each layer of a high voltage coil (1), An interlayer insulating material (5) is provided between each layer (4).
また、高圧コイル（１）と低圧コイル（４）の間には、
絶縁材料（３）が設けられている。さらに、注型可能な
外被用硬化性合成樹脂（６）によって、これらを一体構
造としている。Moreover, between the high voltage coil (1) and the low voltage coil (4),
An insulating material (3) is provided. Furthermore, these are made into an integral structure using a castable curable synthetic resin for the outer covering (6).
絶縁材料（３）、層間絶縁材料（２）としては、クラフ
ト紙、ポリエステルその他の合成樹脂フィルム、同不織
布などが用いられる。また、このような材料と集成マイ
カシートを貼り合わせたもの（集成マイカ複合シート）
や、このような材料に予めエポキシｖｄ１８など電気絶
縁性にすぐれた合成樹脂を含浸したものも使用される。As the insulating material (3) and the interlayer insulating material (2), kraft paper, polyester or other synthetic resin film, nonwoven fabric thereof, etc. are used. In addition, products made by laminating such materials with laminated mica sheets (laminated mica composite sheets)
Alternatively, such materials may be impregnated in advance with a synthetic resin having excellent electrical insulation properties such as epoxy VD18.
高圧コイル（１）の空隙部には、コロナ特性を向上させ
るため、比較的粘性の低い高絶縁性硬化性合成樹脂、例
えばエポキシ樹脂が減圧含浸、便化させられる。外被用
硬化性合成樹１１（６）は、一般に無気質の充填剤、た
とえば石英粉末のようなものを大量に含む、この充填剤
添加により外被用硬化性合成ｖｄ詣（６）の便化反応熱
を減退させ、硬化収縮率、熱収縮率を低下させる。In order to improve the corona characteristics, the void of the high voltage coil (1) is impregnated with a relatively low viscosity, highly insulative hardening synthetic resin, such as an epoxy resin, under reduced pressure. The curable synthetic wood for the outer covering 11 (6) generally contains a large amount of an airless filler, such as quartz powder, and the addition of this filler makes it easier to use the hardenable synthetic wood for the outer covering (6). It reduces the heat of chemical reaction and reduces the curing shrinkage rate and heat shrinkage rate.
［発明が解決しようとする問題点］
上記のような従来の変成器においては、外被用便化性合
成樹１１（６）の硬化時に生じる硬化収縮によって硬化
収縮応力が生じる。また、高圧コイル（１）、低圧コイ
ル（４）とこれら両コイル間に介在する外被用硬化性合
成樹脂（６）あるいは合成樹脂繊維、合成樹脂フィルム
との熱膨張係数の違いにより熱応力が生じる。このため
、コイルと外被用便化性合成樹ｊＩＢ（６）との界面の
剥離によって円周方向に亀裂が生じる。また、円周応力
によって、半径方向に亀裂が生じる。この亀裂によって
、コロナが発生したり、短絡現象を生じたりする問題点
があった。[Problems to be Solved by the Invention] In the conventional transformer as described above, curing shrinkage stress occurs due to curing shrinkage that occurs during curing of the facilitative synthetic wood 11 (6) for the outer covering. In addition, thermal stress may occur due to the difference in thermal expansion coefficient between the high-voltage coil (1), the low-voltage coil (4), and the curable synthetic resin for outer covering (6), synthetic resin fiber, or synthetic resin film interposed between these two coils. arise. For this reason, cracks occur in the circumferential direction due to peeling at the interface between the coil and the synthetic resin jIB (6) for outer covering. Additionally, circumferential stress causes cracks to occur in the radial direction. This crack causes problems such as corona generation and short circuit phenomena.
また、眉間絶縁材料として使用される天然繊維紙（たと
えばクラフト紙）、合成樹脂フィルム（例えばポリエス
テルフィルム）、合成繊維不織布（例えばポリエステル
不織布）、集成マイカ複合シートに、予め高絶縁性硬化
性合成樹脂（６）を含浸硬化させる場合に、次の理由に
より十分含浸されないおそれがある。天然繊維紙では繊
維の密度が高く、十分な含浸が得られない０合成繊維フ
ィルムでは、フィルムを貫通する方向には全く含浸が期
待できない、集成マイカ複合シートでは、鱗片状マイカ
が重なり合っているため貫通方向への含浸が期待できず
、また重なり合った部分は空隙となる０以上のような樹
脂含浸が十分に行われない層間絶縁材料を使用した場合
、未含浸部は減圧含浸によって減圧空間となり、コロナ
開始電圧が低くなる。In addition, highly insulating curable synthetic resin can be added to natural fiber paper (e.g., kraft paper), synthetic resin film (e.g., polyester film), synthetic fiber nonwoven fabric (e.g., polyester nonwoven fabric), and laminated mica composite sheet used as insulation materials between the eyebrows. When impregnating and curing (6), there is a risk that the impregnation may not be sufficient for the following reasons. With natural fiber paper, the fiber density is high and sufficient impregnation cannot be obtained. With synthetic fiber film, no impregnation can be expected in the direction that penetrates the film. With laminated mica composite sheets, the scaly mica overlaps. When using an interlayer insulation material in which impregnation in the penetrating direction cannot be expected, and where the overlapping portions are not sufficiently impregnated with resin such as 0 or more, the unimpregnated portions become vacuum spaces due to vacuum impregnation. Corona starting voltage becomes lower.
一方、合成繊維不織布は樹脂含浸が容易であるが、それ
自体の絶縁破壊電圧が低いという問題点がある。On the other hand, although synthetic fiber nonwoven fabrics can be easily impregnated with resin, they have a problem in that their dielectric breakdown voltage is low.
さらには、眉間絶縁材料が有機物の場合、マグネットワ
イヤーとの熱膨張係数の差から温度サイクルにより接触
部はずれを生じやすくコロナ発生の原因となる。Furthermore, if the glabellar insulating material is an organic material, due to the difference in thermal expansion coefficient with the magnet wire, the contact portion is likely to become dislocated due to temperature cycles, causing corona generation.
この発明は上記の問題点を解決して、コロナ特性のすぐ
れた変成器を提供することを目的とする。The object of the present invention is to solve the above problems and provide a transformer with excellent corona characteristics.
［問題点を解決するため゛の手段］
この発明樟係る変成器においては、高圧コイルの各層間
、低圧コイルの各層間、高圧コイルと低圧コイルの間の
少なくともいずれか１つに、セラミックファイバーシー
トと合成樹脂フィルムからなる複合シートを介在させて
いる。[Means for Solving the Problems] In the transformer according to the present invention, a ceramic fiber sheet is provided between each layer of the high-voltage coil, between each layer of the low-voltage coil, and at least between the high-voltage coil and the low-voltage coil. A composite sheet consisting of a synthetic resin film and a synthetic resin film is interposed.
［作用］
この発明に係る変成器において用いられている複合シー
トは、熱膨張係数が低く、合成樹脂の含浸性にすぐれて
いる。[Function] The composite sheet used in the transformer according to the present invention has a low coefficient of thermal expansion and is excellent in impregnation with synthetic resin.
［実施例］
この発明の一実施例を第１図に示す、高圧コイル（１）
の各層間には眉間絶縁材料（１２）が設けられ、低圧コ
イル（４）の各層間には眉間絶縁材料（１５）が設けら
れている。また、高圧コイル（１）と低圧コイル（４）
の間には、絶縁材料（１３）が設けられている。さらに
、注型可能な外被用便化性合成樹１！（６）によって、
これらを一体構造としている。絶縁材料（１３）、眉間
絶縁材料（１２） （１５）として、セラミックファイ
バーシートと合成樹脂フィルムの複合シートを用いてい
る。[Example] An example of the present invention is shown in FIG. 1, a high voltage coil (1)
A glabellar insulating material (12) is provided between each layer of the low voltage coil (4), and a glabellar insulating material (15) is provided between each layer of the low voltage coil (4). Also, high voltage coil (1) and low voltage coil (4)
An insulating material (13) is provided between them. In addition, 1 castable synthetic tree for the outer covering! By (6),
These are integrated into one structure. A composite sheet of a ceramic fiber sheet and a synthetic resin film is used as the insulating material (13) and the glabellar insulating material (12) (15).
この複合シートの構造を第２図に断面図として示す、合
成樹脂フィルム（例えば、ポリエステル、ポリイミド、
ポリエーテルスルフォン、ポリフェニレンサルファイド
樹脂フィルム）の片面に、電気絶縁性にすぐれた溶剤型
ワニス、あるいは無溶剤型ワニスをセラミックファイバ
ーシートの重量に対し、５〜５０％となるよう塗付する
。その上に、セラミックファイバーシート（２２）を重
ねて、そのままかあるいは少しの圧力をかけて粘り合わ
せ、溶剤の蒸散またはワニスの硬化反応を進ませるよう
ワニスに適した温度の下に加熱した後、巻取る。The structure of this composite sheet is shown in FIG. 2 as a cross-sectional view.
A solvent-based varnish or a solvent-free varnish with excellent electrical insulation properties is applied to one side of the polyether sulfone or polyphenylene sulfide resin film in an amount of 5 to 50% of the weight of the ceramic fiber sheet. On top of that, a ceramic fiber sheet (22) is stacked, either as is or by applying a little pressure to make them stick together, and then heated to a temperature suitable for the varnish to promote evaporation of the solvent or the curing reaction of the varnish. Wind it up.
セラミックファイバーシート（２２）としては、例えば
アルミナファイバー、クォーツファイバーなどいわゆる
抄紙法によってシート状としたものを用いるとよい。As the ceramic fiber sheet (22), it is preferable to use, for example, alumina fiber, quartz fiber, or the like which is formed into a sheet by a so-called paper-making method.
このような方法で得られた複合シートを低圧コイル（４
）の眉間絶縁材料（１５）とし、マグネットワイヤーを
巻回して低圧コイルを得る０次に、この低圧コイルの外
周に複合シートを巻回して、絶縁層（１３）を形成する
。さらに、この外周に、複合シートを眉間絶縁材料（１
２）として、マグネットワイヤ゛−を巻回し、コイル巻
体を得る。このコイル巻体を完成品金型に組み込み、無
機質の微粒充填剤を減圧下において注入する。無機質の
微粒充填剤としては、例えば石英粉などを含有する比較
的低粘度の外被用硬化性合成１１１！（例えば、エポキ
シ樹１１配金組成物）を用いる。注入後、熱硬化処理、
脱型処理を施すことにより、乾式変圧変流器が得られる
。The composite sheet obtained by this method was wrapped in a low-voltage coil (4
) is used as the glabellar insulating material (15), and a magnet wire is wound around it to obtain a low-voltage coil.Next, a composite sheet is wound around the outer periphery of this low-voltage coil to form an insulating layer (13). Furthermore, a composite sheet is placed around this outer periphery with glabellar insulating material (1
2) The magnet wire is wound to obtain a coiled body. This coiled body is assembled into a mold for the finished product, and a fine inorganic filler is injected under reduced pressure. Examples of inorganic fine fillers include curable synthetic 111 for outer coverings with relatively low viscosity and containing, for example, quartz powder. (e.g., epoxy tree 11 metallizing composition). After injection, heat curing treatment,
A dry transformer can be obtained by demolding.
この実施例における絶縁層（１３）は、セラミックファ
イバーが大部分を占める複合シート層であるため、その
熱膨張係数は２５Ｘ １０−１０−１ｌ℃以下である。The insulating layer (13) in this example is a composite sheet layer consisting mostly of ceramic fibers, so its coefficient of thermal expansion is less than 25X 10-10-1 l°C.
また、この複合シートは、合成ａｔ詣フィルム（２１）
とセラミックファイバーシート（２２）が十分に接触し
た状態で巻回されているため、高圧コイル（１）と低圧
コイル（４）の間に発生する熱応力は低い。In addition, this composite sheet is a synthetic AT film (21)
Since the coil and ceramic fiber sheet (22) are wound in sufficient contact with each other, the thermal stress generated between the high voltage coil (1) and the low voltage coil (4) is low.
また、含浸された外被用硬化性合成樹ｊ１（６）の便化
時に発生する硬化収縮応力も低い、このため、高圧コイ
ル（１）、低圧コイル（４）と外被用便化性合成樹脂（
６）の＃１離が防止でき、その成長による円周方向への
亀裂を防止できる。In addition, the curing shrinkage stress that occurs when the impregnated curable synthetic resin for the outer jacket j1 (6) is reduced is also low. resin(
6) #1 separation can be prevented, and cracks in the circumferential direction due to its growth can be prevented.
この実施例における層間絶縁材料（１２）と高圧コイル
（１）の断面を第３図に示す、第５図に比較のため、従
来の眉間絶縁材料（２）と高圧コイル（１）の断面を示
す、第３図において、層間絶縁材料（１２）のセラミッ
クファイバーシート（２２）の表面は、抄紙法によるシ
ートであるため粗い、この粗い面は、セラミックファイ
バーの弾性率が高いので、層間に入れられマグネットワ
イヤーが巻回されても、その張力により表面がつぶれる
ことなく粗い状態で接触する。また、セラミックファイ
バーシート（１３）の断面は粗であるため、あらゆる方
向からの樹脂含浸が可能である。したがって、マグネッ
トワイヤーの周辺、セラミックファイバーシート（２２
）の内部および合成樹脂フィルム（２１）との界面には
空間が生じない、このためコロナ開始電圧は高く、また
コロナを生じてもセラミックファイバーシートはコロナ
劣化に高度な信頼性を示す。Figure 3 shows the cross section of the interlayer insulation material (12) and high voltage coil (1) in this example, and Figure 5 shows the cross section of the conventional glabella insulation material (2) and high voltage coil (1) for comparison. In Fig. 3, the surface of the ceramic fiber sheet (22) of the interlayer insulation material (12) is rough because it is a sheet made by a papermaking method. Even if the magnet wire is wound around the wire, the tension will cause the surface to contact in a rough state without being crushed. Furthermore, since the ceramic fiber sheet (13) has a rough cross section, resin impregnation is possible from all directions. Therefore, around the magnet wire, the ceramic fiber sheet (22
) and at the interface with the synthetic resin film (21). Therefore, the corona starting voltage is high, and even if corona occurs, the ceramic fiber sheet shows high reliability against corona deterioration.
なお、上記実施例では乾式計器用変圧変流器について説
明したが、電力用変圧変流器、油入り変圧変流器にも適
用することができる。In the above embodiment, a dry type meter current transformer has been described, but the present invention can also be applied to a power transformer and an oil-filled transformer.
［発明の効果］
この発明に係る変成器においては、高圧コイルの各層間
、低圧コイルの各層間、高圧コイルと低圧コイルの間の
少なくともいずれか１つに、セラミックファイバーシー
トと合成樹脂フィルムからなる複合シートを介在させて
いる。[Effects of the Invention] In the transformer according to the present invention, at least one of the layers between the high-voltage coils, between the low-voltage coils, and between the high-voltage coil and the low-voltage coil is made of a ceramic fiber sheet and a synthetic resin film. A composite sheet is interposed.
したがって、樹脂含浸性にすぐれ、亀裂・剥離を防止で
さ、コロナ特性を向上させることができる。また、高圧
コイルの予備含浸を除くことができ、製造工程の短縮化
が可能となる。Therefore, it has excellent resin impregnation properties, prevents cracking and peeling, and improves corona properties. Furthermore, preliminary impregnation of the high-voltage coil can be eliminated, making it possible to shorten the manufacturing process.
すなわち、安価でかつ高性能の変成器を提供することが
できる。That is, an inexpensive and high-performance transformer can be provided.
第１図はこの発明の一実施例による変成器の断面図、第
２図は複合シートの断面図、第３図は複合シート付近の
断面図、第４図は従来の変成器の断面図、第５図は従来
の絶縁材料を示す断面図である。
（１）は高圧コイル、（４）は低圧コイル、（１２）、
（１３）、 （１５）は複合シートである。
なお、各図中同一符号は同−又は相当部分を示す。FIG. 1 is a sectional view of a transformer according to an embodiment of the present invention, FIG. 2 is a sectional view of a composite sheet, FIG. 3 is a sectional view of the vicinity of the composite sheet, and FIG. 4 is a sectional view of a conventional transformer. FIG. 5 is a sectional view showing a conventional insulating material. (1) is a high voltage coil, (4) is a low voltage coil, (12),
(13) and (15) are composite sheets. Note that the same reference numerals in each figure indicate the same or corresponding parts.
Claims (1)
ルの各層間、低圧コイルの各層間、高圧コイルと低圧コ
イルの間の少なくともいずれか１つに介在させられたセ
ラミックファイバーシートと合成樹脂フィルムからなる
複合シート、を備えたことを特徴とする変成器。(1) A high-voltage coil, a low-voltage coil magnetically connected to the high-voltage coil, a ceramic interposed between each layer of the high-voltage coil, between each layer of the low-voltage coil, or at least one between the high-voltage coil and the low-voltage coil. A transformer characterized by comprising a composite sheet made of a fiber sheet and a synthetic resin film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62285825A JPH01125913A (en) | 1987-11-11 | 1987-11-11 | Transformator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62285825A JPH01125913A (en) | 1987-11-11 | 1987-11-11 | Transformator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01125913A true JPH01125913A (en) | 1989-05-18 |
Family
ID=17696568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62285825A Pending JPH01125913A (en) | 1987-11-11 | 1987-11-11 | Transformator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01125913A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008047826A (en) * | 2006-08-21 | 2008-02-28 | San-Ei Electronic Industries Co Ltd | Heat radiating structure for vertical coil device |
| JP2008060026A (en) * | 2006-09-04 | 2008-03-13 | Nippon Steel Corp | In-furnace installed induction heating device |
| JP2014204002A (en) * | 2013-04-05 | 2014-10-27 | 富士電機株式会社 | Resin mold coil, manufacturing method therefor and mold transformer |
| JP2015532002A (en) * | 2012-08-14 | 2015-11-05 | シーメンス エナジー インコーポレイテッド | Use of alumina paper for tension relaxation and electrical insulation in high temperature coil windings. |
| EP4099350A1 (en) * | 2021-05-31 | 2022-12-07 | ABB Schweiz AG | A dry high voltage instrument transformer |
-
1987
- 1987-11-11 JP JP62285825A patent/JPH01125913A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008047826A (en) * | 2006-08-21 | 2008-02-28 | San-Ei Electronic Industries Co Ltd | Heat radiating structure for vertical coil device |
| JP2008060026A (en) * | 2006-09-04 | 2008-03-13 | Nippon Steel Corp | In-furnace installed induction heating device |
| JP2015532002A (en) * | 2012-08-14 | 2015-11-05 | シーメンス エナジー インコーポレイテッド | Use of alumina paper for tension relaxation and electrical insulation in high temperature coil windings. |
| JP2014204002A (en) * | 2013-04-05 | 2014-10-27 | 富士電機株式会社 | Resin mold coil, manufacturing method therefor and mold transformer |
| EP4099350A1 (en) * | 2021-05-31 | 2022-12-07 | ABB Schweiz AG | A dry high voltage instrument transformer |
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