JP2013055279A - Stationary induction apparatus - Google Patents

Stationary induction apparatus Download PDF

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JP2013055279A
JP2013055279A JP2011193699A JP2011193699A JP2013055279A JP 2013055279 A JP2013055279 A JP 2013055279A JP 2011193699 A JP2011193699 A JP 2011193699A JP 2011193699 A JP2011193699 A JP 2011193699A JP 2013055279 A JP2013055279 A JP 2013055279A
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coil
spacer
inter
linear
winding
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Keisuke Nakano
恵介 中野
Hideyuki Miyahara
秀幸 宮原
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Hitachi Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide the novel winding of a stationary induction apparatus in which displacement of the winding due to vibration such an earthquake can be prevented while reducing the manufacturing cost.SOLUTION: In the stationary induction apparatus having a winding 100 of such a structure that coils 30, each consisting of an insulation coated wire 40, are stacked in a multistage on the outer periphery of an insulation tube 10 with a linear spacer 20 therebetween, and an inter-coil spacer 50 extending from each linear spacer 20 is sandwiched between respective coils 30, the linear spacer 20 and the inter-coil spacer 50 are composed of a craft material, and a low dielectric constant layer 52 composed of an aramid material is provided on the coil contact surface of the linear spacer 20 and the inter-coil spacer 50.

Description

本発明は、変圧器やリアクトルなどの静止誘導電器に係り、特に電器本体を構成する巻線の構造に関するものである。   The present invention relates to a static induction electric device such as a transformer or a reactor, and particularly to a structure of a winding constituting an electric body.

一般に従来の静止誘導電器は、鉄心と巻線からなる電器本体をタンク内に収容し、そのタンク内を絶縁油などの絶縁冷却媒体で満たした構造となっている。この電器本体の巻線は複数のコイルを絶縁物からなるスペーサを介して多段に積層したものであるが、このスペーサとしてクラフト材からなるプレスボードなどを用いた場合、そのコイルとスペーサ間の微小油隙部分で絶縁破壊が生じることがある。   Generally, a conventional static induction electric appliance has a structure in which an electric main body composed of an iron core and a winding is accommodated in a tank, and the tank is filled with an insulating cooling medium such as insulating oil. The winding of this electric body is a multi-layered structure in which a plurality of coils are interposed through spacers made of an insulator. When a press board made of craft material is used as the spacer, a minute gap between the coils and the spacers is used. Dielectric breakdown may occur in the oil gap.

これは、絶縁冷却媒体である絶縁油の誘電率がスペーサを構成するクラフト材の誘電率よりも低いため、その微小油隙部分の電界強度が高くなり、その微小油隙部分から絶縁破壊が生じるものと考えられている。このため、以下の特許文献1では、コイルとスペーサとの間に、クラフト材よりも低誘電率でかつ柔らかい誘電材料である多孔性高分子材料を使用することでその油隙部分を埋めると同時に巻線外部の電界を緩和する方法が提案されている。   This is because the dielectric constant of the insulating oil, which is an insulating cooling medium, is lower than the dielectric constant of the kraft material that constitutes the spacer, so that the electric field strength of the fine oil gap portion becomes high and dielectric breakdown occurs from the fine oil gap portion. It is considered a thing. For this reason, in Patent Document 1 below, the oil gap portion is filled between the coil and the spacer by using a porous polymer material that is a dielectric material having a lower dielectric constant and softer than the craft material. A method for relaxing the electric field outside the winding has been proposed.

また、以下の特許文献2では、巻線の絶縁紙や直線スペーサ、コイル間スペーサの全てに低誘電率のアラミド材を使用し、絶縁油との誘電率の差を小さくすることによって絶縁耐力を向上させる方法が提案されている。   Also, in Patent Document 2 below, aramid material having a low dielectric constant is used for all of the insulating paper, linear spacers, and inter-coil spacers of the winding, and the dielectric strength is reduced by reducing the difference in dielectric constant from the insulating oil. A way to improve it has been proposed.

特開平5−226166号公報JP-A-5-226166 特開平6−77061号公報JP-A-6-77061

しかしながら、特許文献1の構成では、多孔性高分子材料のような柔らかい材料が使用されているため、機械的強度が低下する他に、巻線締付力および経年劣化によって多孔性高分子材料の弾性が低下するために、地震などの振動によって巻線の位置ずれが発生することが予想される。   However, in the configuration of Patent Document 1, since a soft material such as a porous polymer material is used, not only the mechanical strength is reduced, but also the winding polymer force is deteriorated due to the winding tightening force and aging deterioration. Due to the decrease in elasticity, it is expected that the displacement of the windings will occur due to vibration such as an earthquake.

また、特許文献2の方法では、巻線の絶縁紙や直線スペーサおよびコイル間スペーサの全てにアラミド材を使用しているため、これらをクラフト材で構成する場合に比べてコストが高くなってしまうといった問題がある。   Moreover, in the method of patent document 2, since the aramid material is used for all the insulating paper of winding, a linear spacer, and the spacer between coils, cost will become high compared with the case where these are comprised with a craft material. There is a problem.

そこで、本発明はこれらの課題を解決するために案出されたものであり、その目的は、地震などの振動による巻線の位置ずれを防止できると共に、製造コストを低く抑えることができる新規な静止誘導電器の巻線を提供するものである。   Therefore, the present invention has been devised to solve these problems, and the object of the present invention is to provide a novel device that can prevent the positional deviation of the winding due to vibration such as an earthquake and can reduce the manufacturing cost. A winding for a static induction machine is provided.

前記課題を解決するために本発明は、絶縁筒の外周に直線スペーサを挟んで絶縁被覆電線からなるコイルを多段に積み上げると共に、当該各コイル間に前記各直線スペーサから延びるコイル間スペーサを挟んだ構造の巻線を有する静止誘導電器であって、前記コイル間スペーサを、クラフト材からなる芯材と、当該芯材のコイル接触面に積層されたアラミド材からなる低誘電率層とから構成したことを特徴とする静止誘導電器である。   In order to solve the above-mentioned problems, the present invention is configured by stacking coils made of insulation-coated wires in multiple stages with linear spacers on the outer periphery of an insulating cylinder, and inter-coil spacers extending from the linear spacers between the coils. A static induction electric machine having a winding structure, wherein the inter-coil spacer is composed of a core material made of a craft material and a low dielectric constant layer made of an aramid material laminated on the coil contact surface of the core material. This is a static induction electric device characterized by that.

このような構成によれば、コイル間スペーサの表面と絶縁油との誘電率の差が小さくなって絶縁耐力が向上するため、コイル間スペーサとコイルとの間に発生する微小油隙部分における絶縁破壊を防止できる。この結果、微小油隙部分を埋めるための多孔性高分子材料のような柔らかい材料を使用する必要がないため、地震などの振動による巻線の位置ずれなどを防止できる。また、一般にクラフト材よりも高価なアラミド材(全芳香族ポリアミド繊維)からなる低誘電率層をコイル間スペーサのコイル接触面に設けた構造となっているため、これらスペーサの全てをアラミド材で構成する場合に比べて製造コストを低く抑えることができる。   According to such a configuration, since the difference in dielectric constant between the surface of the inter-coil spacer and the insulating oil is reduced and the dielectric strength is improved, the insulation in the minute oil gap portion generated between the inter-coil spacer and the coil is increased. Destruction can be prevented. As a result, it is not necessary to use a soft material such as a porous polymer material for filling the minute oil gap portion, so that it is possible to prevent a position shift of the winding due to vibration such as an earthquake. In addition, since it has a structure in which a low dielectric constant layer made of aramid material (fully aromatic polyamide fiber), which is more expensive than craft material, is provided on the coil contact surface of the inter-coil spacer, all of these spacers are made of aramid material. The manufacturing cost can be kept low as compared with the case of configuring.

第2の発明は、第1の発明において、前記直線スペーサをクラフト材から構成すると共に、当該直線スペーサのコイル接触面にアラミド材からなる低誘電率層を設けたことを特徴とする静止誘導電器である。   According to a second invention, in the first invention, the linear spacer is made of a craft material, and a low dielectric constant layer made of an aramid material is provided on a coil contact surface of the linear spacer. It is.

このような構成によれば、直線スペーサの表面と絶縁油との誘電率の差が小さくなって絶縁耐力が向上するため、直線スペーサとコイルとの間に発生する微小油隙部分の絶縁破壊を防止できる。この結果、第1の発明と同様な効果が得られる。   According to such a configuration, since the difference in dielectric constant between the surface of the linear spacer and the insulating oil is reduced and the dielectric strength is improved, the dielectric breakdown of the minute oil gap portion generated between the linear spacer and the coil is prevented. Can be prevented. As a result, the same effect as the first invention can be obtained.

本発明によれば、スペーサと絶縁油との誘電率の差が小さくなって絶縁耐力が向上するため、スペーサとコイルとの間に発生する微小油隙部分における絶縁破壊を防止できる。これによって、コイルとスペーサの間に多孔性高分子材料のような柔らかい材料を設ける必要がないため、地震などの振動による巻線の位置ずれなどを防止できる。また、クラフト材よりも高価なアラミド材を直線スペーサおよびコイル間スペーサのコイル接触面にのみ使用したため、製造コストを低く抑えることができる。   According to the present invention, since the difference in dielectric constant between the spacer and the insulating oil is reduced and the dielectric strength is improved, it is possible to prevent dielectric breakdown in the minute oil gap portion generated between the spacer and the coil. Accordingly, it is not necessary to provide a soft material such as a porous polymer material between the coil and the spacer, so that it is possible to prevent a winding position shift due to vibration such as an earthquake. Moreover, since the aramid material more expensive than the craft material is used only for the coil contact surfaces of the linear spacer and the inter-coil spacer, the manufacturing cost can be kept low.

本発明に係る静止誘導電器の巻線100の実施の一形態を示す部分破断斜視図である。1 is a partially broken perspective view showing an embodiment of a winding 100 of a static induction electric machine according to the present invention. 図1中A部を示す部分拡大図である。It is the elements on larger scale which show the A section in FIG. 図2中A部を示す部分拡大図である。It is the elements on larger scale which show the A section in FIG. 図3中A部を示す部分拡大図である。It is the elements on larger scale which show the A section in FIG.

次に、本発明の実施の形態を添付図面を参照しながら説明する。図1は本発明に係る静止誘導電器の巻線100の実施の一形態を示したものである。図において符号10は鉄心(図示せず)が挿入される絶縁筒10であり、この絶縁筒10の外周面には、直線スペーサ20がその周方向に所定の間隔を隔てて複数設けられている。この直線スペーサ20は、クラフト材などの絶縁物から形成されており、絶縁筒10の軸方向に沿って延びるように帯状に形成されている。   Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of a winding 100 of a static induction electric machine according to the present invention. In the figure, reference numeral 10 denotes an insulating cylinder 10 into which an iron core (not shown) is inserted. A plurality of linear spacers 20 are provided on the outer peripheral surface of the insulating cylinder 10 at predetermined intervals in the circumferential direction. . The linear spacer 20 is formed of an insulator such as craft material, and is formed in a strip shape so as to extend along the axial direction of the insulating cylinder 10.

この絶縁筒10の周囲には、これらの直線スペーサ20を介してコイル30が複数上下多段に積み上げるようにして設けられている。このコイル30は、図2に示すように平角絶縁被覆電線(銅線)40を絶縁筒10の半径方向に積層するように複数回巻回して構成されている。この平角絶縁被覆電線40は、図3に示すように断面平角銅線41の外側に絶縁紙(クラフト紙)からなる絶縁層42を備えた構成をしている。   Around the insulating cylinder 10, a plurality of coils 30 are provided so as to be stacked in multiple upper and lower stages via these linear spacers 20. As shown in FIG. 2, the coil 30 is configured by winding a rectangular insulation covered electric wire (copper wire) 40 a plurality of times so as to be laminated in the radial direction of the insulating cylinder 10. As shown in FIG. 3, the flat insulating coated electric wire 40 has a configuration in which an insulating layer 42 made of insulating paper (craft paper) is provided outside a rectangular copper wire 41 in cross section.

また、図1及び図2に示すようにこれら各コイル30、30間には、短冊状のコイル間スペーサ50がその周方向に沿って所定の間隔を隔てて複数設けられている。これら各コイル間スペーサ50、50…は、それぞれその一端が直線スペーサ20に接続されており、1つの直線スペーサ20に対して複数のコイル間スペーサ50、50…が梯子状に設けられている。このコイル間スペーサ50は、図3に示すようにクラフト材からなる芯材51の表面(コイル接触面)にアラミド材からなる低誘電率層52,52を積層したサンドイッチ構造となっている。   As shown in FIGS. 1 and 2, a plurality of strip-like inter-coil spacers 50 are provided between the coils 30 and 30 at a predetermined interval along the circumferential direction. Each of the inter-coil spacers 50, 50... Is connected at one end to the linear spacer 20, and a plurality of inter-coil spacers 50, 50. As shown in FIG. 3, the inter-coil spacer 50 has a sandwich structure in which low dielectric constant layers 52 and 52 made of an aramid material are laminated on the surface (coil contact surface) of a core material 51 made of a craft material.

さらに、図3に示すように、各コイル30,30…の内周面と接触する直線スペーサ20の外面(コイル接触面)にも同様にアラミド材からなる低誘電率層21が設けられている。ここで、この静止誘導電器の巻線100の作成方法としては、例えば、先ずクラフト材からなる絶縁筒10の外周面に複数の直線スペーサ20、20…をその周方向に沿って等間隔に接着し、それら各直線スペーサ20、20…にコイル間スペーサ50を上下多段に取り付ける。その後、最下段のコイル間スペーサ50に接するように絶縁筒10の外周面に平角絶縁被覆電線40を複数回巻き回してコイル30を構成する。そして、そのコイル30上の他のコイル間スペーサ50上に同様にしてコイル30を順次作成し、巻線仕様に合わせて複数段積み上げることで作成することができる。   Further, as shown in FIG. 3, a low dielectric constant layer 21 made of an aramid material is also provided on the outer surface (coil contact surface) of the linear spacer 20 in contact with the inner peripheral surface of each of the coils 30, 30. . Here, as a method of creating the winding 100 of the static induction electric machine, for example, first, a plurality of linear spacers 20, 20... The inter-coil spacers 50 are attached to the linear spacers 20, 20. Thereafter, the rectangular insulating coated electric wire 40 is wound around the outer peripheral surface of the insulating cylinder 10 a plurality of times so as to be in contact with the lowermost inter-coil spacer 50 to constitute the coil 30. Then, the coils 30 can be sequentially formed on the other inter-coil spacers 50 on the coil 30 and stacked in a plurality of stages according to the winding specifications.

そして、このような構成をした本発明に係る静止誘導電器の巻線100にあっては、絶縁筒10の外表面に設けられた直線スペーサ20、20…によって絶縁筒10とコイル30,30…との間には一定の間隙が形成される。また、この直線スペーサ20,20…から半径方向に延びるコイル間スペーサ50,50…によってコイル30間にも一定の間隙が形成される。これによって、その周囲の絶縁冷却媒体である絶縁油がそれらの隙間に容易に流れ込むことができるため、効果的な冷却が実現される。また、コイル間スペーサ50、50…によってコイル30間に一定の絶縁距離が確保されるため、コイル30間における絶縁破壊を防止することができる。   And in the coil | winding 100 of the static induction electric machine which concerns on this invention which comprised such a structure, the insulation cylinder 10 and the coils 30, 30 ... are carried out by the linear spacers 20, 20 ... provided in the outer surface of the insulation cylinder 10. FIG. A certain gap is formed between the two. Further, a constant gap is also formed between the coils 30 by the inter-coil spacers 50 extending in the radial direction from the linear spacers 20. Thereby, since the insulating oil which is the surrounding insulating cooling medium can easily flow into these gaps, effective cooling is realized. Further, since a certain insulation distance is secured between the coils 30 by the inter-coil spacers 50, 50..., Insulation breakdown between the coils 30 can be prevented.

また、本発明では、コイル30と接するコイル間スペーサ50が、クラフト材からなる芯材51の表面(コイル接触面)にアラミド材からなる低誘電率層52を設けた構造となっているため、コイル間スペーサ50の表面と絶縁油との誘電率の差が小さくなって絶縁耐力が向上する。この結果、図4に示すようにコイル30とコイル間スペーサ50との間に形成される微小油隙部分Sにおける絶縁破壊を防止することができる。また、同様にコイル30の内周面と接する直線スペーサ20の外面(コイル接触面)にもアラミド材からなる低誘電率層21が設けられているため、コイル30の内周面と直線スペーサ20との間(特にその角部)における絶縁破壊を防止することができる。   In the present invention, the inter-coil spacer 50 in contact with the coil 30 has a structure in which a low dielectric constant layer 52 made of an aramid material is provided on the surface (coil contact surface) of a core material 51 made of craft material. The difference in dielectric constant between the surface of the inter-coil spacer 50 and the insulating oil is reduced, and the dielectric strength is improved. As a result, it is possible to prevent dielectric breakdown in the minute oil gap portion S formed between the coil 30 and the inter-coil spacer 50 as shown in FIG. Similarly, since the low dielectric constant layer 21 made of an aramid material is also provided on the outer surface (coil contact surface) of the linear spacer 20 in contact with the inner peripheral surface of the coil 30, the inner peripheral surface of the coil 30 and the linear spacer 20 are provided. It is possible to prevent dielectric breakdown between the two (particularly the corner).

以下の表1は、絶縁油中における絶縁物の比誘電率の例として、鉱油中の各種絶縁物の比誘電率を示したものである。変圧器用絶縁油として一般的に使用されている鉱油は、比誘電率が2.2であるのに対し、プレスボードは4.7であり、鉱油の2.14倍である。また、クラフト材は3.5であり、鉱油の1.59倍となっている。これに対し、アラミド材(全芳香族ポリアミド繊維)は、2.47であり、鉱油の1.12倍となっている。   Table 1 below shows the dielectric constants of various insulators in mineral oil as examples of the dielectric constant of insulators in insulating oil. The mineral oil generally used as the insulating oil for transformers has a relative dielectric constant of 2.2, whereas the press board is 4.7, which is 2.14 times that of the mineral oil. The craft material is 3.5, which is 1.59 times that of mineral oil. On the other hand, the aramid material (fully aromatic polyamide fiber) is 2.47, which is 1.12 times that of mineral oil.

Figure 2013055279
Figure 2013055279

このようにアラミド材は、プレスボードやクラフト材と比べて誘電率が低いため、コイル30と接するスペーサのコイル接触面にこのアラミド材からなる低誘電率層52および21を積層すれば、図4に示すようなくさび状の微小油隙部分Sの電界強度も低下して絶縁性能が大幅に向上する。   As described above, since the aramid material has a lower dielectric constant than that of a press board or craft material, if the low dielectric constant layers 52 and 21 made of the aramid material are laminated on the coil contact surface of the spacer in contact with the coil 30, FIG. As shown in FIG. 5, the electric field strength of the wedge-shaped minute oil gap portion S is also reduced, and the insulation performance is greatly improved.

この結果、この微小油隙部分Sを埋めるためにコイル30とコイル間スペーサ50との間に多孔性高分子材料のような柔らかい材料を使用する必要がなくなり、地震などの振動による巻線の位置ずれが起こり難くなる。   As a result, it is not necessary to use a soft material such as a porous polymer material between the coil 30 and the inter-coil spacer 50 in order to fill the minute oil gap portion S, and the position of the winding due to vibration such as an earthquake. Misalignment is less likely to occur.

また、一般にクラフト材よりも高価なアラミド材からなる低誘電率層21,52を直線スペーサ20およびコイル間スペーサ50のコイル接触面にのみ設けた構造とすることにより、これらスペーサ20,50の全てをアラミド材で構成する場合に比べて製造コストを低く抑えることができる。   In addition, since the low dielectric constant layers 21 and 52 made of an aramid material that is generally more expensive than a craft material are provided only on the coil contact surfaces of the linear spacer 20 and the inter-coil spacer 50, all of the spacers 20 and 50 are provided. Compared with the case where is made of an aramid material, the manufacturing cost can be reduced.

100…静止誘導電器の巻線
10…絶縁筒
20…直線スペーサ
21…低誘電率層(直線スペーサ側)
30…コイル
40…絶縁被覆電線
50…コイル間スペーサ
51…芯材
52…低誘電率層(コイル間スペーサ側)
S…微小油隙部分
DESCRIPTION OF SYMBOLS 100 ... Winding of static induction machine 10 ... Insulating cylinder 20 ... Linear spacer 21 ... Low dielectric constant layer (linear spacer side)
30 ... Coil 40 ... Insulated coated electric wire 50 ... Inter-coil spacer 51 ... Core material 52 ... Low dielectric constant layer (inter-coil spacer side)
S ... Minute oil gap

Claims (2)

絶縁筒の外周に直線スペーサを挟んで絶縁被覆電線からなるコイルを多段に積み上げると共に、当該各コイル間に前記各直線スペーサから延びるコイル間スペーサを挟んだ構造の巻線を有する静止誘導電器であって、
前記コイル間スペーサを、クラフト材からなる芯材と、当該芯材のコイル接触面に積層されたアラミド材からなる低誘電率層とから構成したことを特徴とする静止誘導電器の巻線。
This is a static induction electric device having a coil having a structure in which a coil made of an insulation-coated electric wire is stacked in multiple stages with linear spacers on the outer periphery of an insulating cylinder, and inter-coil spacers extending from the linear spacers are sandwiched between the coils. And
A winding for a static induction electric appliance, wherein the inter-coil spacer is composed of a core material made of a craft material and a low dielectric constant layer made of an aramid material laminated on a coil contact surface of the core material.
前記直線スペーサをクラフト材から構成すると共に、当該直線スペーサのコイル接触面にアラミド材からなる低誘電率層を設けたことを特徴とする請求項1に記載の静止誘導電器。   The static induction device according to claim 1, wherein the linear spacer is made of a craft material, and a low dielectric constant layer made of an aramid material is provided on a coil contact surface of the linear spacer.
JP2011193699A 2011-09-06 2011-09-06 Stationary induction apparatus Pending JP2013055279A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019160706A (en) * 2018-03-15 2019-09-19 古河電気工業株式会社 Electrical connection unit material and electrical connection unit material set
CN110660575A (en) * 2019-11-06 2020-01-07 山东电力设备有限公司 Coil outer stay binding tool and binding method
JP2020068356A (en) * 2018-10-26 2020-04-30 東芝産業機器システム株式会社 Stationary induction apparatus winding

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JPS62152114A (en) * 1985-12-26 1987-07-07 Hitachi Ltd Winding for oil-immersed induction electric apparatus
JPS6366910A (en) * 1986-09-08 1988-03-25 Hitachi Ltd Oil-filled induction electrical equipment
JPH01167908A (en) * 1987-12-24 1989-07-03 Teijin Ltd Spacer for gas insulated transformer
JPH0521238A (en) * 1991-07-09 1993-01-29 Hitachi Ltd Oil filled electrical equipment
JPH05226166A (en) * 1992-02-14 1993-09-03 Toshiba Corp Winding of transformer
JPH0677061A (en) * 1992-08-27 1994-03-18 Hitachi Ltd Stationary induction apparatus
JPH0831664A (en) * 1994-07-14 1996-02-02 Fuji Electric Co Ltd Winding for stationary induction apparatus

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Publication number Priority date Publication date Assignee Title
JPS62122112A (en) * 1985-11-21 1987-06-03 Toshiba Corp Oil-filled induction electrical equipment
JPS62152114A (en) * 1985-12-26 1987-07-07 Hitachi Ltd Winding for oil-immersed induction electric apparatus
JPS6366910A (en) * 1986-09-08 1988-03-25 Hitachi Ltd Oil-filled induction electrical equipment
JPH01167908A (en) * 1987-12-24 1989-07-03 Teijin Ltd Spacer for gas insulated transformer
JPH0521238A (en) * 1991-07-09 1993-01-29 Hitachi Ltd Oil filled electrical equipment
JPH05226166A (en) * 1992-02-14 1993-09-03 Toshiba Corp Winding of transformer
JPH0677061A (en) * 1992-08-27 1994-03-18 Hitachi Ltd Stationary induction apparatus
JPH0831664A (en) * 1994-07-14 1996-02-02 Fuji Electric Co Ltd Winding for stationary induction apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019160706A (en) * 2018-03-15 2019-09-19 古河電気工業株式会社 Electrical connection unit material and electrical connection unit material set
JP2020068356A (en) * 2018-10-26 2020-04-30 東芝産業機器システム株式会社 Stationary induction apparatus winding
CN110660575A (en) * 2019-11-06 2020-01-07 山东电力设备有限公司 Coil outer stay binding tool and binding method

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