JPH05190354A - Stationary induction machine - Google Patents
Stationary induction machineInfo
- Publication number
- JPH05190354A JPH05190354A JP266592A JP266592A JPH05190354A JP H05190354 A JPH05190354 A JP H05190354A JP 266592 A JP266592 A JP 266592A JP 266592 A JP266592 A JP 266592A JP H05190354 A JPH05190354 A JP H05190354A
- Authority
- JP
- Japan
- Prior art keywords
- dielectric constant
- winding
- insulator
- spacer
- duct rail
- 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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は変圧器等の静止誘導電気
機器に関するもので、特に巻線の絶縁構造に改良を加え
た静止誘導電気機器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction electric device such as a transformer, and more particularly to a static induction electric device having an improved winding insulation structure.
【０００２】[0002]
【従来の技術】電力用変圧器のような静止誘導電気機器
においては、より高電圧・大容量機器への適用にあた
り、最大の技術的問題はいかに高い絶縁耐力を機器にも
たせ、また機械的強度を向上できるかにかかっている。
従来の静止誘導電気機器の一例として、変圧器を例にと
り以下図面を参照して説明する。2. Description of the Related Art In static induction electric equipment such as power transformers, the biggest technical problem in applying it to higher voltage and large capacity equipment is to provide the equipment with high dielectric strength and mechanical strength. It depends on how much you can improve.
A transformer will be described below as an example of a conventional static induction electric device with reference to the drawings.
【０００３】図３、図４に示すように、図示しない鉄心
の回りに配置された基礎絶縁筒１の外側にその軸方向に
延びて適宜間かくを置いて固定した絶縁物から成る複数
個のダクト用レール２が設けられ、このダクト用レール
２の外側に絶縁紙や絶縁フィルムあるいは絶縁被膜によ
る絶縁物３により被覆された導体４を円板状に巻回して
巻線５が構成されている。その巻線５は基礎絶縁筒１の
軸方向に沿って複数層巻回され、直列に接続されて各巻
回層の間には図示左端をダクト用レール２に溝係合した
絶縁物から成るスペーサ６が挿入され、各層間に冷却ダ
クトが形成されている。導体４は外側から内側、または
内側から外側に巻回して複数のセクション７をそれぞれ
形成しており、セクション７間の間隙は基礎絶縁筒１の
周方向に沿って等配に配置された前記スペーサ６により
その間隙が保持されるように構成されている。このよう
にダクト用レール２、スペーサ６によって基礎絶縁筒１
の周囲に巻回組立てされた巻線５は油あるいはＳＦ6 ガ
ス等の絶縁媒体とともにタンク内に収納される。As shown in FIGS. 3 and 4, a plurality of insulating members extending in the axial direction outside the basic insulating cylinder 1 arranged around an iron core (not shown) and fixed at appropriate intervals are fixed. A duct rail 2 is provided, and a conductor 4 covered with an insulating material 3 such as insulating paper, an insulating film, or an insulating coating is wound on the outside of the duct rail 2 in a disk shape to form a winding 5. .. The winding 5 is wound in a plurality of layers along the axial direction of the basic insulating cylinder 1, is connected in series, and a spacer made of an insulating material in which the left end in the drawing is groove-engaged with the duct rail 2 between the winding layers. 6 is inserted, and a cooling duct is formed between the layers. The conductor 4 is wound from the outer side to the inner side or from the inner side to the outer side to form a plurality of sections 7, and the gaps between the sections 7 are arranged at equal intervals along the circumferential direction of the basic insulating cylinder 1. 6 is configured to hold the gap. In this way, the duct insulating rail 2 and the spacer 6 are used to form the basic insulating cylinder 1.
The winding wire 5 wound around and assembled around is stored in a tank together with an insulating medium such as oil or SF 6 gas.
【０００４】このように構成された変圧器巻線は、図５
の拡大図に示すごとく、最内側に巻かれた導体４の絶縁
物３とダクト用レール２との間、同じく導体４の絶縁物
３とスペーサ６との間にくさび状のギャップＡ，Ｂが形
成され、それが基礎絶縁筒１の外周に沿って連続的に延
びる。The transformer winding thus constructed is shown in FIG.
As shown in the enlarged view of FIG. 3, wedge-shaped gaps A and B are formed between the insulator 3 of the conductor 4 and the duct rail 2 which are wound on the innermost side, and also between the insulator 3 of the conductor 4 and the spacer 6. Is formed, and it extends continuously along the outer circumference of the basic insulating cylinder 1.
【０００５】[0005]
【発明が解決しようとする課題】このようなくさび状の
ギャップＡ，Ｂには、タンク内において当然油あるいは
絶縁性ガスのような絶縁媒体が存在するが、一般にこの
種の絶縁媒体の比誘導率はダクト用レール２やスペーサ
６あるいは導体被覆の絶縁物３の固体絶縁物の比誘電率
に比べ小さいため、比誘電率の小さな絶縁媒体の詰った
くさび状のギャップＡ，Ｂ部分に電界が集中し、高電界
となってこの部分から絶縁破壊に至るため、絶縁信頼性
に乏しく、また、これを防ぐためにはセクション間距離
や巻線間の各部分の絶縁距離を大きくとる必要があり、
機器の大型化を招いていた。In the wedge-shaped gaps A and B, an insulating medium such as oil or insulating gas naturally exists in the tank. Generally, however, a specific induction of this type of insulating medium is required. Since the dielectric constant is smaller than the relative permittivity of the solid material such as the duct rail 2, the spacer 6 or the conductor-coated insulator 3, the electric field is generated in the wedge-shaped gaps A and B filled with the insulating medium having a small relative permittivity. Since it concentrates and becomes a high electric field and causes dielectric breakdown from this part, the insulation reliability is poor, and in order to prevent this, it is necessary to increase the distance between sections and the insulation distance of each part between windings,
This has led to larger equipment.
【０００６】そこで、従来の特に油入変圧器では、特開
昭５３−７４２３１号公報に記載されているように、同
心配置の高低圧巻線間に配置した複数の絶縁筒のうち中
間に配置された絶縁筒のみ比較的低誘電率の絶縁材料で
構成し、高、低圧巻線間の油隙に加わる電界を緩和して
高、低圧巻線間の絶縁距離、すなわち、主絶縁距離の短
縮をはかっている。しかし、実際上、絶縁性能をを決定
する主要因となる高低圧巻線間の局部的な油隙、すなわ
ち前記したようなくさび状ギャップ部分の電界緩和につ
いては配慮されていなかった。Therefore, in the conventional oil-filled transformer, as described in JP-A-53-74231, a plurality of insulating cylinders arranged between concentric high and low voltage windings are arranged in the middle. Only the insulating cylinder is made of an insulating material with a relatively low dielectric constant, and the electric field applied to the oil gap between the high and low voltage windings is relaxed to reduce the insulation distance between the high and low voltage windings, that is, the main insulation distance. I'm thinking. However, in practice, no consideration was given to the local oil gap between the high and low voltage windings, which is the main factor that determines the insulation performance, that is, the electric field relaxation in the wedge-shaped gap portion as described above.
【０００７】ここで、一般に不平等な電界下では１つの
部位でそれを構成する部材の誘電率を変えた場合に、そ
れが他の部位の電界に及ぼす影響は距離と共に小さくな
る傾向があり、変圧器の高低圧巻線表面の電界は不平等
電界である。上記従来技術は巻線表面から離れた部位の
誘電率を変えたものであり、絶縁上肝心な巻線表面に生
ずるくさび状ギャップの電界に関しては緩和効果が小さ
かった。また、高低圧巻線間には絶縁筒の他に絶縁距離
を確保するためのダクト用レールも配設されており、そ
れと接する巻線表面ではむしろダクト用レールによる電
界集中が大きく、単に絶縁筒のみ低誘電率化しても巻線
表面のくさび状ギャップの電界の緩和効果はあまり期待
できない。また一般に、低誘電率絶縁物は通常の絶縁材
料に比べて２倍ないしそれ以上高価であり、効果的に用
いることで使用量を少なくし、コストアップを抑える必
要がある。また特開昭６３−６６９１０号公報に記載さ
れているように、ダクト用レールのみ低誘電率の絶縁物
で構成する手段もあるが、これによっても巻線表面のく
さび状ギャップの電界は十分に低減させることができな
い。[0007] Generally, when the dielectric constant of a member constituting one portion is changed under an unequal electric field, the influence on the electric field of other portions tends to decrease with distance. The electric field on the high and low voltage winding surface of the transformer is an unequal electric field. The above-mentioned conventional technique changes the permittivity of a portion distant from the winding surface, and has a small effect of relaxing the electric field of the wedge-shaped gap generated on the winding surface which is essential for insulation. In addition to the insulating cylinder, a duct rail is also provided between the high and low voltage windings to secure the insulation distance. On the surface of the winding that is in contact with it, the electric field concentration due to the duct rail is rather large. Even if the dielectric constant is lowered, the effect of relaxing the electric field of the wedge-shaped gap on the winding surface cannot be expected so much. In general, a low dielectric constant insulator is twice or more expensive as compared with a normal insulating material, and it is necessary to reduce the amount used and suppress the cost increase by effectively using it. Also, as described in Japanese Patent Laid-Open No. 63-66910, there is also a means of constructing only the duct rail with an insulator having a low dielectric constant, but this also ensures that the electric field in the wedge-shaped gap on the winding surface is sufficient. It cannot be reduced.
【０００８】本発明は以上の点に鑑み、その目的は巻線
表面に形成されるくさび状ギャップの電界を緩和させて
巻線の絶縁信頼性を高め、絶縁距離も小さくして巻線全
体の寸法の縮小化を図った静止誘導電気機器を提供する
ことにある。In view of the above points, an object of the present invention is to reduce the electric field of the wedge-shaped gap formed on the surface of the winding to improve the insulation reliability of the winding and reduce the insulation distance to reduce the entire winding. An object of the present invention is to provide a static induction electric device having a reduced size.
【０００９】[0009]
【課題を解決するための手段】本発明は、上記目的を達
成するために、鉄心の回りに配置した基礎絶縁筒の周囲
にダクト用レール、スペーサ等によって巻線を巻回組立
てした静止誘導電気機器において、ダクト用レール及び
スペーサを少くとも基礎絶縁筒の誘導電率より大きくな
い低誘電率絶縁物にて構成したことを特徴とする。In order to achieve the above object, the present invention provides a static induction electric machine in which a winding is wound and assembled by a duct rail, a spacer and the like around a basic insulating cylinder arranged around an iron core. The device is characterized in that the duct rail and the spacer are made of at least a low dielectric constant insulator which is not higher than the inductive conductivity of the basic insulating cylinder.
【００１０】[0010]
【作用】このように構成すると、導体被覆の絶縁物とダ
クト用レール及びスペーサの間に生じるくさび状ギャッ
プの電界が緩和されるようになり、主絶縁距離が短縮で
き、小型で巻線の絶縁信頼性が高くなる。With this structure, the electric field of the wedge-shaped gap between the insulator of the conductor coating and the duct rail and the spacer is alleviated, the main insulation distance can be shortened, and the insulation of the winding can be reduced. Higher reliability.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面を参照して説明
する。なお、既に説明した従来例と同一部分には同一符
号を付して説明する。図１は本発明の一実施例の要部拡
大断面図である。Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the same parts as those of the conventional example described above are designated by the same reference numerals. FIG. 1 is an enlarged sectional view of an essential part of an embodiment of the present invention.
【００１２】図において、基礎絶縁筒１の外側にその軸
方向に沿って延び、適宜間隔を置いて固定したダクト用
レール８と、このダクト用レール８と溝係合したスペー
サ９が設けられる。そして、これらダクト用レール８と
スペーサ９は少くとも基礎絶縁筒１の誘電率より大きく
ない低誘電率絶縁物から形成されている。各スペーサ９
間には夫々絶縁物３により被覆された導体４が巻回され
巻線を構成する。In the figure, a duct rail 8 extending along the axial direction of the basic insulating cylinder 1 and fixed at appropriate intervals, and a spacer 9 groove-engaged with the duct rail 8 are provided. The duct rail 8 and the spacer 9 are made of a low dielectric constant insulator which is at least not higher than the dielectric constant of the basic insulating cylinder 1. Each spacer 9
A conductor 4 covered with an insulator 3 is wound in between to form a winding.
【００１３】導体４はダクト用レール８の外側に内側か
ら外側、または外側から内側に強固な締め付け力によっ
て巻き付けられる。また、スペーサ９は基礎絶縁筒１の
周方向に沿って適宜の間かくを置いて部分的に配置さ
れ、セクション間の間隙が保持され、上下方向から締め
付けて巻線のガタやずれが生じないように構成されてい
る。The conductor 4 is wound around the outside of the duct rail 8 from the inside to the outside or from the outside to the inside by a strong tightening force. In addition, the spacers 9 are partially arranged along the circumferential direction of the basic insulating cylinder 1 with appropriate gaps, the gaps between the sections are maintained, and the spacers are tightened from the vertical direction to prevent looseness and deviation of the winding. Is configured.
【００１４】この様に構成された本発明の静止誘導電気
機器において、導体４とダクト用レール８、及びスペー
サ９との間に形成されるくさび状ギャップＡ，Ｂでは油
あるいはＳＦ6 ガス等の絶縁媒体が充填された場合、ダ
クト用レール８及びスペーサ９は共に少くとも基礎絶縁
筒１の誘電率よりも大きくない低誘電率の絶縁物で構成
されているため、くさび状ギャップＡ，Ｂの電界を低減
することができる。In the static induction electric apparatus of the present invention having such a structure, the wedge-shaped gaps A and B formed between the conductor 4, the duct rail 8 and the spacer 9 are insulated from oil or SF6 gas. When the medium is filled, both the duct rail 8 and the spacer 9 are made of an insulator having a low dielectric constant that is not larger than the dielectric constant of the basic insulating cylinder 1, so that the electric fields of the wedge-shaped gaps A and B are not formed. Can be reduced.
【００１５】このくさび状ギャップ部分での電界分布を
計算した結果を図２（ａ），（ｂ）に示す。図はくさび
状ギャップＡ，Ｂの電界を導体４とダクト用レール８の
接点をＡ1 、導体４とスペーサ９との接点をＢ1 とし、
絶縁媒体の誘電率ε1 に対するダクト用レール８、スペ
ーサ９の誘電率ε2 の比をパラメータとして示したもの
である。The calculation results of the electric field distribution in the wedge-shaped gap portion are shown in FIGS. 2 (a) and 2 (b). The figure shows the electric field of the wedge-shaped gaps A and B as A 1 at the contact point between the conductor 4 and the duct rail 8 and B 1 as the contact point between the conductor 4 and the spacer 9.
It illustrates duct rail 8 relative dielectric constant epsilon 1 of the insulating medium, the dielectric constant epsilon 2 of the ratio of the spacer 9 as a parameter.
【００１６】くさび状ギャップの電界はＡ1 ，Ｂ1 の各
接点に近づくほど急激に高くなり、かつ絶縁物と絶縁媒
体の誘電率の比ε2 ／ε1 が大きいほど電界を高くなる
ことがわかる。従って、くさび状ギャップＡ，Ｂの電界
を緩和するためには、低誘電率の絶縁物を用いること、
しかも、ダクト用レール８、スペーサ９の両者共低誘電
率にするとくさび状ギャップＡ，Ｂ両者の電界が低減で
き、絶縁信頼性の向上に大きく貢献できることがわか
る。The electric field in the wedge-shaped gap increases sharply as it approaches the contact points A 1 and B 1 , and the electric field increases as the dielectric constant ratio ε 2 / ε 1 between the insulator and the insulating medium increases. Recognize. Therefore, in order to alleviate the electric field in the wedge-shaped gaps A and B, use an insulator having a low dielectric constant,
Moreover, it can be seen that if both the duct rail 8 and the spacer 9 are made to have a low dielectric constant, the electric fields of both the wedge-shaped gaps A and B can be reduced, which can greatly contribute to the improvement of insulation reliability.
【００１７】さらに、本発明において、ダクト用レール
８およびスペーサ９を低誘電率絶縁物にするのに加え
て、導体４を被覆する絶縁物３をも基礎絶縁筒１の誘電
率より大きくない低誘電率の絶縁物により構成すると、
くさび状ギャップＡ，Ｂ部の電界は導体被覆の絶縁物３
も低誘電率となるためさらに低減され、絶縁信頼性がよ
り一層向上し、主間隙距離を大きく短縮することができ
る。Further, in the present invention, in addition to the duct rail 8 and the spacer 9 being made of a low dielectric constant insulating material, the dielectric material 3 for covering the conductor 4 is not lower than the dielectric constant of the basic insulating cylinder 1. If it is composed of an insulator with a dielectric constant,
The electric field in the wedge-shaped gaps A and B is the insulator 3 of the conductor coating.
Since it has a low dielectric constant, it is further reduced, the insulation reliability is further improved, and the main gap distance can be greatly shortened.
【００１８】低誘電率の絶縁物としては、ダクト用レー
ル８やスペーサ９にはパルプ繊維と低誘電率のプラスチ
ック絶縁物例えばポリエチレンテレフタレートやポリプ
ロピレン、ポリメチルペンテンあるいはコーネックス繊
維などを混抄してなる絶縁物あるいは上記プラスチック
材料単体からなる成型品あるいはゴム弾性体であるエラ
ストマー、なかでも、ポリエチレン系、オレフィン系な
どの低誘電率エラストマーが適する。さらに導体被覆の
絶縁物３としては上記パルプ繊維とプラスチックとの混
抄紙や低誘電率のプラスチックフィルムを被覆して用い
てもあるいはまた導体に低誘電率絶縁物をコーティング
してもよい。As the low dielectric constant insulating material, the duct rail 8 and the spacer 9 are made of a mixture of pulp fiber and low dielectric constant plastic insulating material such as polyethylene terephthalate, polypropylene, polymethylpentene or connex fiber. A molded product made of an insulating material or the above plastic material alone or an elastomer which is a rubber elastic body, and among them, a low dielectric constant elastomer such as a polyethylene type or an olefin type is suitable. Further, as the insulator 3 for covering the conductor, a mixed paper of the above pulp fiber and plastic or a plastic film having a low dielectric constant may be coated or used, or the conductor may be coated with a low dielectric constant insulator.
【００１９】もちろん、基礎絶縁筒１も低誘電率の絶縁
物で構成しても良い。なお、レールやスペーサあるいは
導体の被覆絶縁物においてはそれぞれ、その全てを低誘
電率絶縁物で構成しても、あるいは絶縁物同士が接触す
る部分の一部分のみを低誘電率絶縁物で構成してもよ
い。Of course, the basic insulating cylinder 1 may also be made of an insulator having a low dielectric constant. Each of the rails, the spacers, and the covering insulator of the conductor may be formed of a low-dielectric-constant insulator, or only a part of the contact portion between the insulators may be formed of a low-dielectric-constant insulator. Good.
【００２０】[0020]
【発明の効果】以上のように本発明によれば、基礎絶縁
筒の周囲に巻線を巻回組立てするダクト用レール及びス
ペーサを少くとも基礎絶縁筒の誘電率より大きくない低
誘電率絶縁物で構成したので、導体とダクト用レール、
またはスペーサとで作るくさび状ギャップの電界を緩和
し、絶縁信頼性を向上させ、主間隙距離を縮少して小形
化した静止誘導電気機器を提供することができる。As described above, according to the present invention, the low dielectric constant insulator having the duct rail and the spacer for winding and assembling the winding around the basic insulating cylinder is not larger than the dielectric constant of the basic insulating cylinder at least. Because it consisted of, conductor and duct rail,
Alternatively, it is possible to provide a static induction electric device in which the electric field of the wedge-shaped gap formed with the spacer is relaxed, the insulation reliability is improved, and the main gap distance is reduced to reduce the size.
【図１】本発明の一実施例を示す要部断面図。FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.
【図２】本発明の要部の電界緩和効果を説明する説明
図。FIG. 2 is an explanatory diagram illustrating an electric field relaxation effect of a main part of the present invention.
【図３】従来の静止誘導電気機器の巻線断面図。FIG. 3 is a winding cross-sectional view of a conventional static induction electric device.
【図４】従来の巻線の要部を示す斜視図。FIG. 4 is a perspective view showing a main part of a conventional winding.
【図５】従来の巻線の要部を示す拡大断面図。FIG. 5 is an enlarged sectional view showing a main part of a conventional winding.
１…基礎絶縁筒 ３…絶縁物 ４…導体 ５…巻線 ８…ダクト用レール ９…スペーサ 1 ... Basic insulating cylinder 3 ... Insulator 4 ... Conductor 5 ... Winding 8 ... Duct rail 9 ... Spacer
Claims (2)
にダクト用レール、スペーサ等によって巻線を巻回組立
した静止誘導電気機器において、ダクト用レール及びス
ペーサを少くとも前記基礎絶縁筒の誘電率より大きくな
い低誘導電率絶縁物にて構成したことを特徴とする静止
誘導電気機器。1. In a static induction electric device in which a winding is assembled by winding a duct rail, a spacer, etc. around a basic insulating cylinder arranged around an iron core, the duct rail and the spacer are at least the basic insulating cylinder. A static induction electric device characterized by being made of a low-inductive-constant insulator that is not larger than the dielectric constant.
にダクト用レール、スペーサ等によって巻線を巻回組立
した静止誘導電気機器において、ダクト用レール、スペ
ーサ及び導体を被覆する絶縁物を少くとも基礎絶縁筒の
誘電率より大きくない低誘電率絶縁物にて構成したこと
を特徴とする静止誘導電気機器。2. In a static induction electric device in which a winding is wound and assembled by a duct rail, a spacer and the like around a basic insulating cylinder arranged around an iron core, an insulator for covering the duct rail, the spacer and the conductor is provided. A static induction electric device characterized by being made of a low dielectric constant insulator that is at least not higher than the dielectric constant of the basic insulating cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP266592A JPH05190354A (en) | 1992-01-10 | 1992-01-10 | Stationary induction machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP266592A JPH05190354A (en) | 1992-01-10 | 1992-01-10 | Stationary induction machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05190354A true JPH05190354A (en) | 1993-07-30 |
Family
ID=11535616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP266592A Pending JPH05190354A (en) | 1992-01-10 | 1992-01-10 | Stationary induction machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05190354A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4906419A (en) * | 1986-08-15 | 1990-03-06 | Lonza-Werke G.M.B.H. | Process for the production of oxide-ceramic materials |
| WO2016059827A1 (en) * | 2014-10-17 | 2016-04-21 | 株式会社 日立メディコ | Transformer and high-voltage generation device |
| WO2020186692A1 (en) * | 2019-03-18 | 2020-09-24 | 广东电网有限责任公司 | Superconducting current limiter having composite insulation structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62147710A (en) * | 1985-12-23 | 1987-07-01 | Toshiba Corp | Winding for induction electric apparatus |
| JPS6366910A (en) * | 1986-09-08 | 1988-03-25 | Hitachi Ltd | Oil-filled induction electrical equipment |
| JPH03205811A (en) * | 1990-01-08 | 1991-09-09 | Hitachi Ltd | Transformer winding |
-
1992
- 1992-01-10 JP JP266592A patent/JPH05190354A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62147710A (en) * | 1985-12-23 | 1987-07-01 | Toshiba Corp | Winding for induction electric apparatus |
| JPS6366910A (en) * | 1986-09-08 | 1988-03-25 | Hitachi Ltd | Oil-filled induction electrical equipment |
| JPH03205811A (en) * | 1990-01-08 | 1991-09-09 | Hitachi Ltd | Transformer winding |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4906419A (en) * | 1986-08-15 | 1990-03-06 | Lonza-Werke G.M.B.H. | Process for the production of oxide-ceramic materials |
| WO2016059827A1 (en) * | 2014-10-17 | 2016-04-21 | 株式会社 日立メディコ | Transformer and high-voltage generation device |
| JPWO2016059827A1 (en) * | 2014-10-17 | 2018-02-08 | 株式会社日立製作所 | Transformer and high voltage generator |
| WO2020186692A1 (en) * | 2019-03-18 | 2020-09-24 | 广东电网有限责任公司 | Superconducting current limiter having composite insulation structure |
| US11250975B2 (en) | 2019-03-18 | 2022-02-15 | Guangdong Power Grid Co., Ltd. | Superconducting current limiter having composite insulation structure |
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