JP2001196241A - Insulation coil for oil-filled electric appliance - Google Patents
Insulation coil for oil-filled electric applianceInfo
- Publication number
- JP2001196241A JP2001196241A JP2000007337A JP2000007337A JP2001196241A JP 2001196241 A JP2001196241 A JP 2001196241A JP 2000007337 A JP2000007337 A JP 2000007337A JP 2000007337 A JP2000007337 A JP 2000007337A JP 2001196241 A JP2001196241 A JP 2001196241A
- Authority
- JP
- Japan
- Prior art keywords
- insulating
- oil
- layer
- coil
- layers
- 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
Landscapes
- Insulating Of Coils (AREA)
- Transformer Cooling (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、油入変圧器等の
油入電気機器の絶縁構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulation structure for an oil-filled electric device such as an oil-filled transformer.
【０００２】[0002]
【従来の技術】油入変圧器等の絶縁コイルに用いられる
巻線は、クラフト紙等で被覆、あるいはエナメル被覆を
施して素線絶縁したものが鉄心に巻装され、絶縁油とと
もに密封タンク内に収納されて使用される。図４は従来
の巻線構造を示す断面図である。図において、１は巻
線、２は素線絶縁層、３は素線絶縁された巻線１が配列
されて巻回された絶縁導体層、４は各絶縁導体層３間の
層間絶縁層で、約１２５μｍの厚さのクラフト紙４ａを
２層積層して構成する。このような巻線構造は、各絶縁
導体層３の外周にクラフト紙４ａを１層ずつ２層に巻装
し、さらにその外周に巻線１を巻回することにより製造
する。層間絶縁層４は、何らかの原因により破れなどが
発生したときの信頼性確保のため、２層以上の積層構造
にする必要があり、従来から、耐油性の良好なクラフト
紙４ａ等の絶縁紙を積層して用いていた。2. Description of the Related Art The winding used for an insulating coil of an oil-immersed transformer or the like is covered with kraft paper or the like and coated with enamel and insulated with wires. It is stored and used. FIG. 4 is a sectional view showing a conventional winding structure. In the figure, 1 is a winding, 2 is a wire insulation layer, 3 is an insulated conductor layer in which the wire 1 insulated by wire is arranged and wound, and 4 is an interlayer insulation layer between the insulated conductor layers 3. , Two layers of kraft paper 4a having a thickness of about 125 μm. Such a winding structure is manufactured by winding two layers of kraft paper 4a on the outer periphery of each insulated conductor layer 3 one by one, and further winding the winding 1 on the outer periphery. The interlayer insulating layer 4 needs to have a laminated structure of two or more layers in order to secure reliability when a break or the like occurs due to any cause. Conventionally, insulating paper such as kraft paper 4a having good oil resistance is used. They were used in layers.
【０００３】[0003]
【発明が解決しようとする課題】従来の絶縁コイルの巻
線は以上のように構成されており、層間絶縁層４にクラ
フト紙４ａを積層して用いていた。クラフト紙４ａは機
械的強度が比較的弱いものであり、各層のクラフト紙４
ａを巻装する際、周方向にかかる引張力による紙破れ等
を防止するために、１層あたり約１２５μｍという比較
的厚い紙が用いられる。このように厚いクラフト紙４ａ
を積層することは、層間絶縁層４の電気絶縁特性面から
すると過剰なものであったが、上述したように、信頼性
確保のために積層する必要があること、および、巻装時
に引っ張り強度を確保する必要があることのために、ク
ラフト紙４ａの使用量を低減することが困難であり、層
間絶縁層４の絶縁材料コストを増大させるものであっ
た。The winding of the conventional insulated coil is constructed as described above, and kraft paper 4a is laminated on the interlayer insulating layer 4 and used. The kraft paper 4a has relatively low mechanical strength, and the kraft paper 4a
When winding a, a relatively thick paper having a thickness of about 125 μm per layer is used in order to prevent a paper tear or the like due to a tensile force applied in a circumferential direction. Such thick kraft paper 4a
Is excessive in view of the electrical insulation characteristics of the interlayer insulating layer 4, but as described above, it is necessary to stack the layers to ensure reliability, and the tensile strength at the time of winding is high. Therefore, it is difficult to reduce the amount of the kraft paper 4a used, and the cost of the insulating material of the interlayer insulating layer 4 is increased.
【０００４】この発明は、上記のような問題点を解消す
るために成されたものであって、絶縁導体層の各層間に
配設された層間絶縁層における絶縁性能および巻装時の
信頼性を保持しつつ、上記層間絶縁層に使用する絶縁材
料の使用量を低減してコスト低減を図ることを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide insulation performance and reliability during winding of an interlayer insulating layer provided between each of the insulated conductor layers. It is an object of the present invention to reduce the amount of the insulating material used for the interlayer insulating layer and reduce the cost while maintaining the above.
【０００５】[0005]
【課題を解決するための手段】この発明に係る請求項１
記載の油入電気機器用絶縁コイルは、素線絶縁された巻
線が配列されて巻回された絶縁導体層の各層間に配設さ
れた層間絶縁層が、上記各絶縁導体層の外周に複数の絶
縁層が順次巻装された積層構造であり、該絶縁層に、巻
装時における周方向の引っ張り強度が所定値以上のプラ
スチック薄膜フィルムを用いたものである。Means for Solving the Problems Claim 1 according to the present invention.
The insulated coil for oil-filled electrical equipment according to the above, wherein an interlayer insulating layer disposed between each layer of the insulated conductor layer in which the wire insulated wire is arranged and wound is formed on the outer periphery of each of the insulated conductor layers. The insulating layer has a laminated structure in which a plurality of insulating layers are sequentially wound, and a plastic thin film having a tensile strength in a circumferential direction at the time of winding which is equal to or more than a predetermined value is used as the insulating layer.
【０００６】またこの発明に係る請求項２記載の油入電
気機器用絶縁コイルは、請求項１において、層間絶縁層
を構成する複数の絶縁層に、絶縁紙から成る層を一層の
み用いたものである。According to a second aspect of the present invention, there is provided an insulating coil for oil-filled electric equipment according to the first aspect, wherein only a single layer of insulating paper is used for a plurality of insulating layers constituting an interlayer insulating layer. It is.
【０００７】またこの発明に係る請求項３記載の油入電
気機器用絶縁コイルは、請求項２において、層間絶縁層
を、プラスチック薄膜フィルムと絶縁紙とを積層した２
層構造としたものである。According to a third aspect of the present invention, there is provided an insulating coil for oil-filled electric equipment according to the second aspect, wherein the interlayer insulating layer is formed by laminating a plastic thin film and insulating paper.
It has a layered structure.
【０００８】またこの発明に係る請求項４記載の油入電
気機器用絶縁コイルは、請求項２または３において、絶
縁導体層の端部位置で、プラスチック薄膜フィルムの端
部を絶縁紙の端部で覆うものである。According to a fourth aspect of the present invention, there is provided the insulating coil for oil-filled electric equipment according to the second or third aspect, wherein the end of the plastic thin film is connected to the end of the insulating paper at the end of the insulated conductor layer. It is covered with.
【０００９】またこの発明に係る請求項５記載の油入電
気機器用絶縁コイルは、請求項１〜４のいずれかにおい
て、プラスチック薄膜フィルムをポリプロピレンフィル
ムで構成したものである。According to a fifth aspect of the present invention, there is provided an insulating coil for oil-filled electric equipment, wherein the plastic thin film is made of a polypropylene film in any one of the first to fourth aspects.
【００１０】またこの発明に係る請求項６記載の油入電
気機器用絶縁コイルは、請求項５において、ポリプロピ
レンフィルムを、約２５〜６０μｍの厚さとしたもので
ある。According to a sixth aspect of the present invention, there is provided an insulating coil for oil-filled electrical equipment according to the fifth aspect, wherein the polypropylene film has a thickness of about 25 to 60 μm.
【００１１】[0011]
【発明の実施の形態】実施の形態１．以下、この発明の
実施の形態１を図について説明する。図１は、この発明
の実施の形態１による油入変圧器等の絶縁コイルの巻線
構造を示す断面図である。図において、１は巻線、２は
素線絶縁層、３は素線絶縁された巻線１が配列されて巻
回された絶縁導体層、５は各絶縁導体層３間の層間絶縁
層で、約５０μｍの厚さのプラスチック薄膜フィルムと
してのポリプロピレンフィルム６と約１２５μｍの厚さ
の絶縁紙としてのクラフト紙７とを積層して構成する。
このような巻線構造は、各絶縁導体層３の外周にポリプ
ロピレンフィルム６とクラフト紙７とを順次巻装し、さ
らにその外周に巻線１を巻回することにより製造する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a winding structure of an insulating coil such as an oil-immersed transformer according to Embodiment 1 of the present invention. In the figure, 1 is a winding, 2 is a wire insulation layer, 3 is an insulated conductor layer in which the wire 1 insulated by wire is arranged and wound, and 5 is an interlayer insulation layer between the insulated conductor layers 3. , A polypropylene film 6 as a plastic thin film having a thickness of about 50 μm and a kraft paper 7 as an insulating paper having a thickness of about 125 μm.
Such a winding structure is manufactured by sequentially winding the polypropylene film 6 and the kraft paper 7 around the outer periphery of each insulated conductor layer 3 and further winding the winding 1 around the outer periphery.
【００１２】この実施の形態では、従来２層で用いられ
ていたクラフト紙７を１層として、他の一層に薄いポリ
プロピレンフィルム６を用いた。このようなクラフト紙
７とポリプロピレンフィルム６との特性比較、および、
絶縁破壊強度と設計電界強度との比較を図２に示す。図
２の表に示すように、約５０μｍの厚さの薄いポリプロ
ピレンフィルム６は、クラフト紙７の引っ張り強度の数
倍の強度を有するため、薄手のフィルムであっても巻装
時の周方向の引張力に充分耐えることができ、損傷なく
巻装できる。また、絶縁性能も良好であり、絶縁破壊強
度も設計電界値に比較して充分に高いため、全く問題が
ない。また、ポリプロピレンフィルム６とクラフト紙７
とを巻装し、油浸後はクラフト紙７の優れた耐油性が生
かされ、信頼性が維持できる。また、ポリプロピレンは
安価なプラスチック材料であり、１２５μｍ程度のクラ
フト紙と比較して、約５０μｍの厚さのポリプロピレン
フィルムは格段と安価である。このため、１層のクラフ
ト紙７とポリプロピレンフィルム６との２層構造を用い
たこの発明の実施の形態では、クラフト紙を積層して用
いていた従来のものと比べ、層間絶縁層５の絶縁材料の
コスト低減が図れ、油入変圧器のコストも低減できる。In this embodiment, a single layer of kraft paper 7 conventionally used in two layers is used, and a thin polypropylene film 6 is used in another layer. Comparison of characteristics between such kraft paper 7 and polypropylene film 6, and
FIG. 2 shows a comparison between the dielectric breakdown strength and the design electric field strength. As shown in the table of FIG. 2, the thin polypropylene film 6 having a thickness of about 50 μm has a strength several times the tensile strength of the kraft paper 7. It can sufficiently withstand tensile force and can be wound without damage. In addition, the insulation performance is good, and the dielectric breakdown strength is sufficiently higher than the design electric field value, so that there is no problem at all. In addition, polypropylene film 6 and kraft paper 7
After the oil immersion, the excellent oil resistance of the kraft paper 7 is utilized and the reliability can be maintained. Also, polypropylene is an inexpensive plastic material, and a polypropylene film having a thickness of about 50 μm is much cheaper than kraft paper of about 125 μm. For this reason, in the embodiment of the present invention using a two-layer structure of one layer of kraft paper 7 and a polypropylene film 6, the insulation of the interlayer insulating layer 5 is smaller than that of the conventional one in which kraft paper is laminated. The cost of the material can be reduced, and the cost of the oil-filled transformer can be reduced.
【００１３】なお、ポリプロピレンフィルム６は、２５
μｍ程度より厚いものであれば、充分な引っ張り強度が
得られるが、材料コストを抑えるために、６０μｍ程度
より薄いものが望ましい。The polypropylene film 6 has a thickness of 25.
If it is thicker than about μm, a sufficient tensile strength can be obtained, but in order to reduce material cost, a thinner than about 60 μm is desirable.
【００１４】また、ポリプロピレン等、プラスチックフ
ィルムは、一般に薄膜でも引っ張り強度が比較的強いた
め、ポリプロピレンに限らず、安価な材料のプラスチッ
クフィルムを用いれば良い。A plastic film such as polypropylene generally has a relatively high tensile strength even in the case of a thin film. Therefore, not only polypropylene but also a plastic film of an inexpensive material may be used.
【００１５】また、上記実施の形態では、ポリプロピレ
ンフィルム６とクラフト紙７との２層構造としたが、ク
ラフト紙７を１層のみとすれば、安価で薄いポリプロピ
レンフィルム６を２層以上としても良く、多層にするこ
とによりさらに信頼性が向上する。さらに、ポリプロピ
レンフィルム６はクラフト紙７に比べ耐油性が低いた
め、油浸後の機械的強度は若干悪くなるものであるが、
クラフト紙７を用いずに、ポリプロピレンフィルム６の
みを積層、あるいはポリプロピレンフィルム６と他のプ
ラスチックフィルム等との積層構造とすることもでき
る。In the above embodiment, the two-layer structure of the polypropylene film 6 and the kraft paper 7 is used. However, if the kraft paper 7 has only one layer, the inexpensive and thin polypropylene film 6 can have two or more layers. In addition, the reliability is further improved by using a multilayer structure. Further, since the polypropylene film 6 has lower oil resistance than the kraft paper 7, the mechanical strength after oil immersion is slightly deteriorated.
Instead of using the kraft paper 7, only the polypropylene film 6 may be laminated, or a laminated structure of the polypropylene film 6 and another plastic film may be used.
【００１６】実施の形態２．図３は、この発明の実施の
形態２による油入変圧器等の絶縁コイルの巻線構造を示
す断面図である。図に示すように、各絶縁導体層３間の
層間絶縁層５を、約５０μｍの厚さのプラスチック薄膜
フィルムとしてのポリプロピレンフィルム６ａと約１２
５μｍの厚さの絶縁紙としてのクラフト紙７ａとを積層
して構成し、絶縁導体層３の端部位置で、ポリプロピレ
ンフィルム６ａの端部をクラフト紙７ａの端部で覆う。
これにより上記実施の形態１と同様に、層間絶縁層５の
絶縁材料のコスト低減が図れると共に、油により膨潤し
たポリプロピレンフィルム６ａの端部が耐油性の良好な
クラフト紙７ａで覆われるため、ポリプロピレンフィル
ム６ａの端部の機械特性が向上し、信頼性向上が図れ
る。Embodiment 2 FIG. 3 is a sectional view showing a winding structure of an insulating coil such as an oil-immersed transformer according to Embodiment 2 of the present invention. As shown in the figure, the interlayer insulating layer 5 between the insulated conductor layers 3 is made of a polypropylene film 6a as a plastic thin film having a thickness of about 50 μm and a polypropylene
The kraft paper 7a as an insulating paper having a thickness of 5 μm is laminated, and the end of the polypropylene film 6a is covered with the end of the kraft paper 7a at the end of the insulated conductor layer 3.
Thus, as in the first embodiment, the cost of the insulating material of the interlayer insulating layer 5 can be reduced, and the end of the polypropylene film 6a swollen with oil is covered with kraft paper 7a having good oil resistance. The mechanical properties at the end of the film 6a are improved, and the reliability can be improved.
【００１７】[0017]
【発明の効果】以上のように、この発明に係る請求項１
記載の油入電気機器用絶縁コイルは、素線絶縁された巻
線が配列されて巻回された絶縁導体層の各層間に配設さ
れた層間絶縁層が、上記各絶縁導体層の外周に複数の絶
縁層が順次巻装された積層構造であり、該絶縁層に、巻
装時における周方向の引っ張り強度が所定値以上のプラ
スチック薄膜フィルムを用いたため、層間絶縁層に使用
する絶縁材料のコスト低減が可能になり、安価で信頼性
の高い油入電気機器用絶縁コイルを得ることが可能にな
る。As described above, the first aspect of the present invention is as follows.
The insulated coil for oil-filled electrical equipment according to the above, wherein an interlayer insulating layer disposed between each layer of the insulated conductor layer in which the wire insulated wire is arranged and wound is formed on the outer periphery of each of the insulated conductor layers. It is a laminated structure in which a plurality of insulating layers are sequentially wound, and the insulating layer is made of a plastic thin film having a tensile strength in the circumferential direction at the time of winding which is equal to or more than a predetermined value. The cost can be reduced, and an inexpensive and highly reliable insulating coil for oil-filled electric equipment can be obtained.
【００１８】またこの発明に係る請求項２記載の油入電
気機器用絶縁コイルは、請求項１において、層間絶縁層
を構成する複数の絶縁層に、絶縁紙から成る層を一層の
み用いたため、絶縁紙の耐油性を生かして信頼性を保持
しつつ層間絶縁層の絶縁材料のコスト低減が確実に図れ
る。According to a second aspect of the present invention, in the insulating coil for oil-filled electrical equipment according to the first aspect, only one layer of insulating paper is used for a plurality of insulating layers constituting an interlayer insulating layer. The cost of the insulating material of the interlayer insulating layer can be reliably reduced while maintaining the reliability by utilizing the oil resistance of the insulating paper.
【００１９】またこの発明に係る請求項３記載の油入電
気機器用絶縁コイルは、請求項２において、層間絶縁層
を、プラスチック薄膜フィルムと絶縁紙とを積層した２
層構造としたため、層間絶縁層の絶縁材料のコスト低減
が、絶縁層の信頼性を保持しつつ確実で効果的に図れ
る。According to a third aspect of the present invention, there is provided an insulating coil for oil-filled electrical equipment according to the second aspect, wherein the interlayer insulating layer is formed by laminating a plastic thin film and insulating paper.
Because of the layer structure, the cost of the insulating material for the interlayer insulating layer can be reduced reliably and effectively while maintaining the reliability of the insulating layer.
【００２０】またこの発明に係る請求項４記載の油入電
気機器用絶縁コイルは、請求項２または３において、絶
縁導体層の端部位置で、プラスチック薄膜フィルムの端
部を絶縁紙の端部で覆うため、プラスチック薄膜フィル
ム端部の機械特性が向上し、信頼性が向上する。According to a fourth aspect of the present invention, there is provided the insulating coil for oil-filled electric equipment according to the second or third aspect, wherein the end of the plastic thin film is connected to the end of the insulating paper at the end of the insulated conductor layer. , The mechanical properties of the edge of the plastic thin film are improved, and the reliability is improved.
【００２１】またこの発明に係る請求項５記載の油入電
気機器用絶縁コイルは、請求項１〜４のいずれかにおい
て、プラスチック薄膜フィルムをポリプロピレンフィル
ムで構成したため、層間絶縁層の絶縁材料のコスト低減
が確実に図れる。According to a fifth aspect of the present invention, there is provided an insulating coil for oil-filled electrical equipment according to any one of the first to fourth aspects, wherein the plastic thin film is made of a polypropylene film. Reduction can be ensured.
【００２２】またこの発明に係る請求項６記載の油入電
気機器用絶縁コイルは、請求項５において、ポリプロピ
レンフィルムを、約２５〜６０μｍの厚さとしたため、
巻装時における周方向の引っ張り強度が充分で、信頼性
良く層間絶縁層の絶縁材料のコスト低減が確実に図れ
る。According to a sixth aspect of the present invention, there is provided an insulating coil for an oil-filled electric device, wherein the polypropylene film has a thickness of about 25 to 60 μm.
The tensile strength in the circumferential direction at the time of winding is sufficient, and the cost of the insulating material of the interlayer insulating layer can be reliably reduced with high reliability.
【図１】 この発明の実施の形態１による絶縁コイルの
巻線構造を示す断面図である。FIG. 1 is a sectional view showing a winding structure of an insulated coil according to a first embodiment of the present invention.
【図２】 この発明の実施の形態１によるクラフト紙と
ポリプロピレンフィルムとの性能を示した図である。FIG. 2 is a diagram showing the performance of a kraft paper and a polypropylene film according to the first embodiment of the present invention.
【図３】 この発明の実施の形態２による絶縁コイルの
巻線構造を示す断面図である。FIG. 3 is a sectional view showing a winding structure of an insulated coil according to a second embodiment of the present invention.
【図４】 従来の絶縁コイルの巻線構造を示す断面図で
ある。FIG. 4 is a cross-sectional view showing a winding structure of a conventional insulating coil.
１ 巻線、２ 素線絶縁層、３ 絶縁導体層、５ 層間
絶縁層、６，６ａ プラスチック薄膜フィルムとしての
ポリプロピレンフィルム、７，７ａ 絶縁紙としてのク
ラフト紙。1 Winding, 2 strand insulation layer, 3 insulated conductor layer, 5 interlayer insulation layer, 6,6a polypropylene film as plastic thin film, 7,7a kraft paper as insulation paper.
Claims (6)
れた絶縁導体層の各層間に配設された層間絶縁層が、上
記各絶縁導体層の外周に複数の絶縁層が順次巻装された
積層構造であり、該絶縁層に、巻装時における周方向の
引っ張り強度が所定値以上のプラスチック薄膜フィルム
を用いたことを特徴とする油入電気機器用絶縁コイル。1. An interlayer insulating layer provided between layers of an insulated conductor layer in which element-insulated windings are arranged and wound, and a plurality of insulating layers are sequentially provided on the outer periphery of each of the insulated conductor layers. An insulating coil for oil-filled electrical equipment, wherein the insulating layer has a laminated structure, and a plastic thin film having a tensile strength in a circumferential direction of a predetermined value or more at the time of winding is used for the insulating layer.
絶縁紙から成る層を一層のみ用いたことを特徴とする請
求項１記載の油入電気機器用絶縁コイル。2. The method according to claim 1, wherein the plurality of insulating layers constituting the interlayer insulating layer include:
The insulating coil for oil-filled electric equipment according to claim 1, wherein only one layer made of insulating paper is used.
ムと絶縁紙とを積層した２層構造としたことを特徴とす
る請求項２記載の油入電気機器用絶縁コイル。3. The insulating coil for oil-filled electric equipment according to claim 2, wherein the interlayer insulating layer has a two-layer structure in which a plastic thin film and insulating paper are laminated.
薄膜フィルムの端部を絶縁紙の端部で覆うことを特徴と
する請求項２または３記載の油入電気機器用絶縁コイ
ル。4. The insulating coil for oil-filled electric equipment according to claim 2, wherein an end of the plastic thin film is covered with an end of insulating paper at an end of the insulated conductor layer.
レンフィルムで構成したことを特徴とする請求項１〜４
のいずれかに記載の油入電気機器用絶縁コイル。5. A plastic thin film comprising a polypropylene film.
The insulating coil for an oil-filled electric device according to any one of the above.
０μｍの厚さとしたことを特徴とする請求項５記載の油
入電気機器用絶縁コイル。6. A polypropylene film having a thickness of about 25 to 6
6. The insulating coil for oil-filled electrical equipment according to claim 5, wherein the insulating coil has a thickness of 0 [mu] m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000007337A JP2001196241A (en) | 2000-01-17 | 2000-01-17 | Insulation coil for oil-filled electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000007337A JP2001196241A (en) | 2000-01-17 | 2000-01-17 | Insulation coil for oil-filled electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001196241A true JP2001196241A (en) | 2001-07-19 |
Family
ID=18535736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000007337A Pending JP2001196241A (en) | 2000-01-17 | 2000-01-17 | Insulation coil for oil-filled electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001196241A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013021200A (en) * | 2011-07-13 | 2013-01-31 | Hitachi Industrial Equipment Systems Co Ltd | Stationary apparatus |
| CN104576032A (en) * | 2014-12-02 | 2015-04-29 | 海鸿电气有限公司 | Manufacturing method for varnish impregnation-free and pouring-free transformer |
-
2000
- 2000-01-17 JP JP2000007337A patent/JP2001196241A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013021200A (en) * | 2011-07-13 | 2013-01-31 | Hitachi Industrial Equipment Systems Co Ltd | Stationary apparatus |
| CN104576032A (en) * | 2014-12-02 | 2015-04-29 | 海鸿电气有限公司 | Manufacturing method for varnish impregnation-free and pouring-free transformer |
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