JP4170546B2 - Insulating coil, resin impregnation apparatus and resin impregnation method - Google Patents

Description

【０１１１】
上記の表において、比較例の含浸速度は３０ｍｍ／ｈであるのに対し、実験例１の含浸速度は３３０ｍｍ／ｈである。ここで、実験例１では被含浸絶縁層７９に圧力差が作用するが、比較例では被含浸絶縁層７９に圧力差が作用しない。この結果、被含浸絶縁層７９に圧力差が作用する場合には、含浸速度が非常に速くなることが示された。
【０１１２】
また、比較例の含浸速度は３０ｍｍ／ｈであるのに対し、実験例２の含浸速度は１１０ｍｍ／ｈである。ここで、実験例２では含浸前に被含浸絶縁層７９の乾燥が行われているが、比較例では含浸前に被含浸絶縁層７９の乾燥が行われていない。この結果、被含浸絶縁層７９の乾燥を行うと、含浸速度が速くなることが示された。
【０１１３】
また、比較例の含浸速度は３０ｍｍ／ｈであるのに対し、実験例３〜５の含浸速度はそれぞれ４０ｍｍ／ｈ、５２ｍｍ／ｈ、６０ｍｍ／ｈである。ここで、実験例３〜５では被含浸絶縁層７９にスペーサが挿入されているが、比較例では被含浸絶縁層７９にスペーサが挿入されていない。この結果、被含浸絶縁層７９にスペーサを挿入すると、含浸速度が速くなることが示された。また、スペーサの材質の違いも含浸速度に若干の影響があることが示された。
【０１１４】
また、実験例２の含浸速度は１１０ｍｍ／ｈであるのに対し、実験例６の含浸速度は７０ｍｍ／ｈである。ここで、実験例６では被含浸絶縁層７９にスペーサが挿入されているが、実験例２では被含浸絶縁層７９にスペーサが挿入されていない。また、実験例６では被含浸絶縁層７９の曲率が実験例２と比べて小さくなっている。この結果、被含浸絶縁層７９の大きさが大きくなると、含浸速度が遅くなるとともに、被含浸絶縁層７９の曲率が小さくなると、スペーサの挿入が含浸速度の改善にあまり寄与しなくなることが示された。
【０１１５】
また、実験例６の含浸速度は７０ｍｍ／ｈであるのに対し、実験例７の含浸速度は９５ｍｍ／ｈである。ここで、実験例７では樹脂の液面と被含浸絶縁層７９の含浸面との差が実験例７と比べて大きくなっている。この結果、樹脂の液面と被含浸絶縁層７９の含浸面との差が大きくなると、含浸速度が速くなることが示された。
【０１１６】
また、実験例７の含浸速度は９５ｍｍ／ｈであるのに対し、実験例８の含浸速度は２１０ｍｍ／ｈである。ここで、実験例８では樹脂の粘度が実験例７と比べて小さくなっている。この結果、樹脂の粘度が小さくなると、含浸速度が速くなることが示された。
【０１１７】
このように、含浸速度には、乾燥、スペーサ、樹脂面のヘッド差、絶縁物に加わる圧力差および樹脂粘度等が影響することが明らかになった。
【０１１８】
実験例９は、実験例４と同じ絶縁構成で樹脂を含浸して、約５０ｃｍまで樹脂を浸透させた後、急速に注入樹脂速度を速め、被含浸絶縁層７９の上端より上に樹脂面がくるようにした。その後、真空ポンプを止め、アクリル製外筒７１内部を徐々に大気圧に戻す操作をした。この操作により、上部からの樹脂含浸が３分程度で約４０ｍｍ浸透した。この結果、真空と大気圧を繰り返すことで含浸速度が速まることが示された。
【０１１９】
実験例１０では、静電容量法および抵抗法の実験を行った。静電容量法では、３０ｍｍ幅、２ｍｍ厚さのＦＲＰ板２枚を対向させ、ＦＲＰ板の内面にアルミテープを貼り、ＦＲＰ板の適度な位置に５ｍｍのギャップ用駒を挟み、静電容量用の電極とした。この静電容量法は、液面の上昇に従って容量が徐々に増加する連続測定に適している。
【０１２０】
抵抗法では、１ｍｍφの絶縁電線の先端を１０ｍｍ程度裸にして、１０ｍｍ幅に並行に配置し、ＦＲＰ板に固定した。この抵抗法では、含浸樹脂に浸った領域は、未含浸のドライの状態の領域に比べて、抵抗値が３〜４桁変化する。このため、抵抗法では、含浸樹脂の有無を精度よく測定することが可能となる。従って、リミッターや２個を使用した液面制御などに効果的に使用できる。
【０１２１】
以上説明したように、上述した実施例によれば、緻密な絶縁物やフィルムを含む難含浸性の絶縁層に対しても、スペーサ、乾燥、含浸液面、圧力差、粘度などを効果的に取り入れ、コイルの下部から含浸することにより、ボイドの少ない含浸絶縁を行うことができる。さらに、含浸の最終過程での圧力変化による含浸の促進と加圧硬化により、ボイドをさらに減少させることが可能となるとともに、絶縁コイルの前後に設けられた樹脂注入管の冷却により、ゲル化時の樹脂の硬化収縮を補償することが可能となり、ボイドのより一層の低減とクラックの発生の抑制に効果がある。
【０１２２】
さらに、含浸樹脂系よりも低価格なポリエチレンなどの埋め草を充填することにより、製品価格の低減に寄与することが可能となるとともに、硬化時の発熱の抑制や成形時の作業時間の短縮にも優れた効果がある。
【０１２３】
また、一般に超電導コイルの場合は、運転時に強大な電磁力が働き、その電磁力に対しても超電導線が正常に固定されていることが要求される。そのため、コイルの巻き線張力は非常に高くなり、超電導線が絶縁物に対しても強い圧縮力を加えた状態が多い。そのような絶縁コイルに含浸するのは、非常に長時間を要するので、含浸に対して工夫が必要である。そこで、上述した含浸法を超電導コイルに適用することにより、ボイドの少ない含浸を短時間で行うことができ、その効果が大きい。
【０１２４】
【発明の効果】
以上説明したように、本発明の絶縁コイルによれば、絶縁コイルの層間絶縁層が強い圧縮力を受けた絶縁物や密度の高い絶縁物で構成される場合においても、それらの絶縁物の中に樹脂を効率よく浸透させることが可能となり、樹脂の含浸にかかる時間を短縮することが可能となる。
【０１２５】
また、本発明の含浸装置によれば、絶縁コイル内の樹脂の未含浸部が含浸樹脂で囲まれて、未含浸部に存在する空気の逃げ道が塞がれることを防止することが可能となり、樹脂含浸のボイドの発生を抑制することが可能となる。
【０１２６】
また、樹脂の比重と高さに比例した圧力を絶縁コイルにかけながら、含浸樹脂を行うことが可能となり、含浸速度を向上させることが可能となる。
【０１２７】
また、絶縁コイルを浸漬している樹脂面の高さを、前記絶縁コイルの樹脂の含浸面以下に制御することが可能となり、樹脂含浸時のボイドの発生を抑制することが可能となる。
【０１２８】
また、樹脂の含浸方向に沿って絶縁コイル内に存在する空気を追い出しながら、含浸を行うことが可能となり、樹脂含浸時のボイドの発生を抑制することが可能となる。
【０１２９】
また、真空引きによるボイドの抑制と加圧による含浸速度の向上という両方の要請を満たしつつ、樹脂含浸を行うことが可能となり、いずれか一方を犠牲にする必要がなくなることから、ボイドを最少に押さえつつ、含浸速度を向上させることが可能となる。
【０１３０】
また、樹脂液面や含浸面の連続測定および測定精度の向上を図ることが可能となる。
【０１３１】
また、本発明の硬化装置によれば、樹脂の供給に寄与しない部分の樹脂の硬化を速め、樹脂の供給に寄与する部分の樹脂の硬化を遅らせることが可能となり、硬化時の収縮分の樹脂をその収縮部分へ供給しながら、樹脂の硬化を進めることが可能となることから、硬化時のボイドの発生を抑制することが可能となる。
【０１３２】
また、絶縁コイルへの樹脂の供給経路が絶たれることを防止することが可能となり、硬化時の収縮分の樹脂を絶縁コイル内へ供給しながら、樹脂の硬化を進めることが可能となることから、硬化時のボイドの発生を抑制することが可能となる。
【０１３３】
また、本発明の含浸方法によれば、埋め草の体積分だけ樹脂の使用量を低減させることが可能となるとともに、絶縁コイルの周りに固着した樹脂の剥離を容易に行うことが可能となり、コストの低減および作業性の改善を図ることが可能となる。また、樹脂の充填量が減少することから、樹脂の硬化時の反応熱による硬化温度の不均一性を減少させることが可能となり、絶縁コイルの品質を向上させることが可能となる。
【０１３４】
また、樹脂を注入した際に埋め草が移動し、樹脂の送出管が詰まることを防止することが可能となる。
【０１３５】
また、絶縁コイルの絶縁物の熱膨張差による変形やひずみを抑制することが可能なるとともに、絶縁コイルへの樹脂の注入を絶縁コイルの乾燥終了から即座に行うことが可能となる。
【図面の簡単な説明】
【図１】本発明の一実施例に係わる絶縁コイルの概略構成を示す切り欠き外観図である。
【図２】図２（ａ）は、図１のＡの部分の拡大図、図２（ｂ）は、超伝導巻線の拡大図である。
【図３】本発明の一実施例に係わる樹脂含浸コイルの製造装置の概略構成を示すブロック図である。
【図４】本発明の一実施例に係わる含浸位置検出器の概略構成を示す側面図である。
【図５】本発明の一実施例に係わる樹脂含浸コイルの各工程の製造条件を示すタイムチャートである。
【図６】本発明の一実施例に係わる含浸工程での樹脂の注入方法を示す断面図である。
【図７】本発明の一実施例に係わる含浸工程での樹脂の含浸方法を示す断面図である。
【図８】本発明の一実施例に係わる硬化工程での樹脂の硬化方法を示す断面図である。
【図９】本発明の一実施例に係わる樹脂の含浸方法のその他の例を示す断面図である。
【図１０】本発明の実験例に係わる樹脂含浸の実験装置の構成を示す断面図である。
【符号の説明】
１ 絶縁コイル
２ａ、２ｂ 口出し部
１１ ヘリウム送出管
１２ 超伝導巻線
１３ コンジット
１４ 巻線絶縁層
１４ａ、１５ａ〜１７ａ ガラステープ
１４ｂ 貼り合わせテープ
１５ 対地絶縁層
１６、１７ 層間絶縁層
１５ｂ〜１７ｂ スペーサ
１５ｃ〜１７ｃ 隙間
１８ 離型層
１９ａ、１９ｂ ソレノイド
２２ 液面計
２３ 含浸位置検出器
２４ 圧力容器
２５ 恒温槽
２６ 攪拌脱泡機
２７ 樹脂貯留槽
２８、３０ 圧力制御装置
２９ 真空ポンプ
３１ａ〜３１ｃ 温度制御装置
３２ａ〜３２ｅ バルブ
４１ａ、４１ｂ リード線
４２ａ、４２ｂ 金属導体
４３ａ〜４３ｃ 固定板
７１、８１ アクリル製外筒
７２ アクリル製中間内筒
７３、８２ アクリル製内筒
７４、８３ アクリル製上蓋
７５、８４ 底板
７６、８５ 真空ポンプ接続排気口
７７、８６ 樹脂注入口
７８ ゴムシール
７９、８７ 被含浸絶縁層[0001]
BACKGROUND OF THE INVENTION
The present invention provides an insulating coil, Resin impregnation apparatus and resin impregnation method In particular, the present invention is suitable for application when a resin is efficiently injected into an insulating coil or a superconducting coil used in an electric device.
[0002]
[Prior art]
In order to improve insulation strength and mechanical strength in insulation coils used in conventional electrical equipment and superconducting equipment, resin is injected and impregnated into an insulator that insulates the windings of the insulation coil, and the resin is heated and cured. Things have been done.
[0003]
When the resin is impregnated, after the insulated material to be impregnated is stored in a pressure vessel, moisture and the like are deaerated at a degree of vacuum of 20 to 50 Pa while adjusting the temperature. Then, while maintaining the vacuum, the resin is injected to a level at which the material to be impregnated is buried, and the evacuation time is adjusted depending on the difficulty of impregnation. Then, the resin impregnation is performed by breaking the vacuum and switching to pressurization. When the resin impregnation is completed, the pressure is released, and the insulated material to be impregnated is taken out of the resin, cured by heating with a dryer or the like, and then molded. This method is called a vacuum / pressure impregnation method (VPI method), and is most frequently used in the conventional resin impregnation method.
[0004]
In this VPI method, the impregnation rate is improved by appropriately crushing the residual gas in the object to be impregnated and simultaneously impregnating the resin and reducing the gas (void) in the insulator.
[0005]
[Problems to be solved by the invention]
However, in the conventional VPI method, in order to switch to pressurization after impregnation under reduced pressure, if gas remains in the insulator, the gas is encased in the impregnation resin. For this reason, in the fine part in an insulator, substitution of gas and resin was prevented by viscosity of resin, and it was difficult to fully carry out substitution of gas and resin. For this reason, the conventional VPI method has a problem that voids in the insulator cannot be completely removed. If there is a void in the insulator, in the case of a coil that is used at a high voltage, a partial discharge can easily occur from the void, which can greatly affect the coil life and impair the reliability of the equipment. is there.
[0006]
In addition, in the conventional VPI system, a coil covered with a thick insulating layer, a coil with a large volume of insulating material, an insulating layer using a large amount of film tape, an insulating material subjected to compressive force, an insulating material with high density When it is applied to the above, it is more difficult to exhaust the gas in the insulator completely and replace the gas in the insulator with the impregnating resin at a practical vacuum level. For this reason, in the conventional VPI method, sufficient resin impregnation is performed for coils covered with a thick insulating layer, coils with a large volume of insulator, coils having an insulating layer using a large amount of film tape, etc. The remaining void was a more serious problem.
[0007]
In particular, in the case of a superconducting coil, it is required that a strong electromagnetic force works during operation and the superconducting wire is normally fixed against the electromagnetic force. Therefore, the winding tension of the coil becomes very high, and the superconducting wire often has a strong compressive force applied to the insulator. It takes a very long time to impregnate such an insulating coil, and it becomes even more difficult to perform sufficient resin impregnation.
[0008]
In addition, the presence of voids in superconducting equipment causes problems such as generation of cracks due to concentration of stress when cooled to a very low temperature as well as problems of partial discharge and reduction in mechanical strength. When a crack occurs, the superconducting device is fatally broken due to the heat generated by this, and a quench phenomenon occurs in which the transition from superconducting to normal conduction occurs.
[0009]
Accordingly, an object of the present invention is to provide an insulating coil, a resin impregnation apparatus, a resin curing apparatus, a resin impregnation method, and a resin curing method capable of reducing the time required for resin impregnation while reducing voids. That is.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, according to the insulating coil of the present invention, the insulating layer is provided with the impregnation path generating means for generating the resin impregnation path.
[0011]
As a result, even when the insulating layer of the insulating coil is made of an insulator that has received a strong compressive force or an insulator with a high density, a resin permeation path is ensured for those insulators, and the insulation of those insulating layers is secured. It is possible to efficiently infiltrate the resin into the object, and it is possible to shorten the time required for the impregnation of the resin.
[0012]
Moreover, according to the impregnation apparatus of the present invention, the resin surface control means for controlling the height of the resin surface in which the insulating coil is immersed to be equal to or lower than the resin impregnated surface of the insulating coil is provided.
[0013]
As a result, it is possible to prevent the resin impregnation of the insulating coil from above and below, the unimpregnated portion of the resin in the insulating coil is surrounded by the impregnating resin, and the air escape path existing in the unimpregnated portion is blocked. Since it becomes possible to prevent peeling, generation | occurrence | production of the void at the time of resin impregnation can be suppressed.
[0014]
In addition, according to the impregnation apparatus of the present invention, it is possible to provide defoaming means for defoaming the resin impregnated in the insulation coil at a position higher than the insulation coil.
[0015]
Accordingly, it is possible to perform the impregnation while applying a pressure proportional to the specific gravity and height of the resin to the insulating coil, and it is possible to improve the impregnation speed.
[0016]
Moreover, according to the impregnation apparatus of this invention, the resin supply means which supplies resin impregnated to an insulation coil from the downward direction of the said insulation coil can be provided.
[0017]
Thereby, the height of the resin surface in which the insulating coil is immersed can be controlled to be equal to or lower than the resin impregnated surface of the insulating coil, and generation of voids during resin impregnation can be suppressed.
[0018]
Moreover, it is preferable that the said resin supply means supplies the said resin to the said insulated coil below the speed | rate which resin penetrates into the said insulated coil.
[0019]
Accordingly, it is possible to perform the impregnation while expelling the air present in the insulating coil along the resin impregnation direction, and it is possible to suppress the generation of voids during the resin impregnation.
[0020]
Further, according to the impregnation apparatus of the present invention, a evacuation means for evacuating the resin in which the insulating coil is immersed, a pressure control means for controlling the pressure applied to the resin, and the pressure of the resin during the impregnation of the insulating coil It is characterized by comprising switching control means for performing switching control between control and vacuuming.
[0021]
This makes it possible to perform resin impregnation while satisfying both requirements of suppression of voids by evacuation and improvement of impregnation speed by pressurization, and it is not necessary to impregnate at the expense of either one, It is possible to improve the impregnation speed while minimizing voids.
[0022]
In addition, according to the impregnation apparatus of the present invention, it is possible to include a liquid level meter using a capacitance method or a resistance method and an impregnation position detector using a capacitance method or a resistance method.
[0023]
As a result, continuous measurement of the resin liquid surface and the impregnated surface can be performed, and the measurement accuracy can be improved.
[0024]
In addition, according to the curing apparatus of the present invention, the temperature distribution control means for controlling the temperature distribution of the resin being cured is provided.
[0025]
As a result, it is possible to accelerate the curing of the resin that does not contribute to the resin supply and to delay the curing of the resin that contributes to the resin supply, while supplying the shrinkage resin during the curing to the contracted part. Since the curing of the resin can be promoted, it is possible to suppress the generation of voids during the shrinkage of the resin accompanying the curing.
[0026]
Moreover, it is preferable that the said temperature distribution control means is equipped with the heating means which heats an insulation coil, and the cooling means which cools the piping which sends resin to the said insulation coil below the temperature of the said insulation coil.
[0027]
This makes it possible to supply the resin to the insulating coil while preventing the resin supply path to the insulating coil from being cut off due to the hardening of the resin. Since it becomes possible to advance hardening, it becomes possible to suppress generation | occurrence | production of the void at the time of hardening.
[0028]
Further, according to the impregnation method of the present invention, resin-impregnated is carried out after disposing releasable padding that does not react with the resin around the insulating coil.
[0029]
As a result, the amount of resin used can be reduced by the volume of the padding grass, and the resin fixed around the insulating coil can be easily peeled off, reducing costs and improving workability. Can be achieved. Moreover, since the filling amount of the resin is reduced, it is possible to reduce the non-uniformity of the curing temperature due to the reaction heat at the time of curing the resin, and it is possible to improve the quality of the insulating coil.
[0030]
Further, it is preferable that the padding grass is confined within a predetermined range by using a fixing means that allows the resin to pass through and does not allow the padding grass to pass through.
[0031]
This makes it possible to prevent the filling grass from moving when the resin is injected and clogging the resin delivery pipe.
[0032]
Moreover, it is preferable to dry the insulating coil at a temperature equal to or lower than the curing temperature of the resin before impregnation with the resin.
[0033]
As a result, it is possible to suppress deformation and distortion due to the difference in thermal expansion of the insulator of the insulating coil, and it is possible to immediately inject the resin into the insulating coil after the drying of the insulating coil.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an insulating coil and its impregnation / curing method according to an embodiment of the present invention will be described with reference to the drawings.
[0035]
FIG. 1 is a cutout external view showing a schematic configuration of an insulating coil according to an embodiment of the present invention. In addition, although the superconducting coil was taken as an example in the insulating coil shown in FIG. 1, the present invention can be applied to other insulating coils. In FIG. 1, an insulating coil 1 is formed by concentrically stacking solenoids in which superconducting wires are wound in a cylindrical shape, and lead portions 2 a and 2 b are provided on the upper and lower surfaces of the insulating coil 1. ing.
[0036]
FIG. 2A is an enlarged view of a portion A in FIG. In FIG. 2A, a twisted superconducting wire 12 is sealed inside a conduit 13, and the conduit 13 is covered with a winding insulating layer 14.
[0037]
FIG. 2B is an enlarged view of the conduit type superconducting winding of FIG. In FIG.2 (b), the coil | winding insulating layer 14 can be comprised from the glass tape 14a and the bonding tape 14b, for example. For example, the glass tape 14 a is halved on the innermost layer of the winding insulating layer 14, and the bonding tape is halved on the second to fourth layers of the winding insulating layer 14. be able to. In addition, as the bonding tape 14b, a film obtained by bonding a polyimide film and a glass tape can be used.
[0038]
In FIG. 2 (a), solenoids 19a and 19b, in which the conduit type superconducting wire 12 of FIG. 2 (b) is wound in a cylindrical shape, are concentrically stacked in layers, and between the solenoids 19a and 19b, Interlayer insulating layers 16 and 17 are provided. A ground insulating layer 15 is provided around the outermost solenoid 19 a, and a release layer 18 is provided outside the ground insulating layer 15.
[0039]
The interlayer insulating layers 16 and 17 can be configured as, for example, a three-layer winding of glass tapes 16 a and 17 a ½ stacked in the circumferential direction. The ground insulating layer 15 can be configured, for example, as a 10-layer winding of the glass tape 15a in half in the circumferential direction. The release layer 18 can be configured, for example, as a single layer winding of 1/4 layer of Teflon tape.
[0040]
Between the glass tapes 15 a to 17 a constituting the interlayer insulating layers 16 and 17 and the ground insulating layer 15, spacers 15 b to 17 b having a predetermined width are inserted in the vertical direction with a certain interval. By inserting the spacers 15b to 17b between the glass tapes 15a to 17a and winding the glass tapes 15a to 17a around the solenoids 19a and 19b, there are gaps 15c on both sides of each spacer 15b to 17b. ~ 17c can be formed.
[0041]
By forming gaps 15c to 17c between the respective layers of the glass tapes 15a to 17a, it becomes possible to form resin passages when the resin is injected into the interlayer insulating layers 16 and 17 and the ground insulating layer 15 from below. It is possible to facilitate resin impregnation of the interlayer insulating layers 16 and 17 and the ground insulating layer 15.
[0042]
That is, when the resin is impregnated into a film material or a coil having a large volume, the impregnation time becomes long. In particular, in the case of a superconducting coil, the winding tension of the coil is very high, and the superconducting wire often has a strong compressive force applied to the insulator. It takes a very long time to impregnate such an insulating coil, and it is difficult to sufficiently impregnate the resin.
[0043]
Therefore, in order to facilitate the impregnation, the insulating tape is wound while inserting a band-shaped or rod-shaped insert for each appropriate insulating layer in a direction crossing the insulating tape. Thereby, a slight space can be generated between the insert and the insulating tape, and a resin impregnation path can be generated in the insulating layer. For this reason, since the resin is injected into the impregnation path in advance and the resin can be impregnated and penetrated on both sides of the impregnation path, the resin impregnation area is increased and the impregnation time can be shortened.
[0044]
The spacers 15b to 17b can be made of, for example, tape, cloth, ceramic paper, belt-shaped FRP (glass reinforced laminate), or the like.
[0045]
Further, when the outer diameter of the insulating coil 1 is 3600 mm and the height is 3075 mm, the thickness of the spacers 15b to 17b is about 0.2 to 0.5 mm, the width is about 32 mm, and the interval is about 500 mm. Is preferred.
[0046]
FIG. 3 is a block diagram showing a schematic configuration of a resin impregnated coil manufacturing apparatus according to an embodiment of the present invention. In FIG. 3, the thermostat 25 is provided with a temperature control device 31 c that controls the temperature in the thermostat 25, and the pressure vessel 24 is provided in the thermostat 25. An insulating coil 1 is installed in the pressure vessel 24, and a liquid level gauge 22 and an impregnation position detector 23 are installed beside the insulating coil 1.
[0047]
Here, in the liquid level gauge 22 and the impregnation position detector 23, the electrostatic capacity method or the resistance method can be used for the measurement of the resin liquid surface during the impregnation and the penetration surface into the insulator of the insulating coil 1. .
[0048]
In the electrostatic capacitance method, the configuration of the counter electrode used in the electrostatic capacitance method is only required to be able to geometrically fix the electrode plate, and fixing the electrode plate to FRP or the like is simple and effective. Further, the impregnated resin can be detected by sandwiching a glass cloth or a nonwoven fabric between the electrodes.
[0049]
The resistance method is a method of measuring the resistance between the electrodes arranged at the tips of two insulated lead wires. Either the electrodes are fixed to an insulating plate, or the insulation coating at the tip of the lead wires is peeled off so as to face each other. Can be arranged. This resistance method is very sensitive because there is a resistance difference of 3 to 5 digits depending on the presence or absence of the resin in the insulating layer.
[0050]
FIG. 4 is a side view showing a schematic configuration of an impregnation position detector using a resistance method. In FIG. 4, lead wires 41a and 41b are fixed to the fixing plates 43a to 43c, and metal conductors 42a and 42b are provided as electrodes at the tips of the lead wires 41a and 41b.
[0051]
In FIG. 3, a stirring deaerator 26 and a resin storage tank 27 are provided above the pressure vessel 24. The stirring deaerator 26 is connected to the lower surface of the pressure vessel 24 through a pipe 33a. Is connected to the upper surface of the pressure vessel 24 through a pipe 33b. Here, the impregnation speed can be increased by providing the stirring deaerator 26 above the pressure vessel 24 and installing the stirring deaerator 26 at a higher position than the insulating coil 1. That is, normally, defoaming is also performed by vacuum stirring, but thin film defoaming is often performed immediately before impregnation. At this time, if the position of the stirring deaerator 26 is higher than that of the insulating coil 1, it becomes possible to apply a pressure proportional to the specific gravity and height of the impregnating resin to the insulating coil 1, and the impregnation speed can be increased. .
[0052]
The piping 33 a is provided with a temperature control device 31 a that uniquely controls the temperature of the piping 33 a and a valve 32 e for injecting the resin of the stirring and defoaming machine 26 into the pressure vessel 24. The pipe 33b is provided with a temperature control device 31b that uniquely controls the temperature of the pipe 33b.
[0053]
Here, by providing the temperature control devices 31a and 31b for controlling the temperatures of the pipes 33a and 33b separately from the temperature control device 31c for controlling the temperature in the thermostatic chamber 25, the contraction state of the resin and the fluidity of the resin can be achieved. It becomes possible to control locally, and the impregnation and curing of the resin can be promoted while efficiently discharging the gas present in the insulating coil 1 to the outside.
[0054]
The stirring deaerator 26 is connected to a pressure control device 28 that controls the pressure in the stirring deaerator 26 via a valve 32a, and a valve 32b to a vacuum pump 29 that evacuates the stirring deaerator 26. Connected through.
[0055]
The resin storage tank 27 is connected to a pressure control device 30 that controls the pressure in the resin storage tank 27 via a valve 32d, and is connected to a vacuum pump 29 that evacuates the resin storage tank 27 via a valve 32c. It is connected.
[0056]
Here, a vacuum pump 29 is provided in the agitation deaerator 26 and the resin reservoir 27, and pressure control devices 28 and 30 are provided so that the resin is impregnated in the insulating coil 1 while repeating pressurization and evacuation. This can be performed, and the gas existing in the insulating coil 1 can be efficiently discharged outside while maintaining the wettability of the resin to the insulating coil 1 to some extent. The pressure control devices 28 and 30 supply, for example, an inert gas such as nitrogen gas or argon gas to the stirring deaerator 26 and the resin storage tank 27, thereby causing the inside of the stirring deaerator 26 and the resin storage tank 27 to be supplied. The pressure inside can be controlled.
[0057]
FIG. 5 is a time chart showing the manufacturing conditions of each step of the resin-impregnated coil according to one embodiment of the present invention. In FIG. 5, the production of the resin-impregnated coil is mainly performed through four steps of a drying step, an impregnation step, a curing step, and a release step.
[0058]
In the drying step, the insulating coil before resin impregnation is kept at a temperature equal to or lower than the resin curing temperature, and is used in combination with reduced pressure, or the insulating coil is dried while flowing an inert gas.
[0059]
For example, in FIG. 3 and FIG. 5, the insulating coil 1 is disposed in the pressure vessel 24, and the liquid level gauge 22 and the impregnation position detector 23 are installed beside the insulating coil 1. Then, by opening the valve 32c and evacuating the pressure vessel 24 through the resin storage tank 27 by the vacuum pump 29, the inside of the thermostatic chamber 25 is heated within the range of the resin curing temperature or less, thereby Dry.
[0060]
Thus, by setting the temperature of the insulating coil 1 at the time of drying to be equal to or lower than the resin curing temperature, it is possible to minimize deformation and distortion due to the difference in thermal expansion of the insulator of the insulating coil 1 and to the insulating coil 1. The resin can be injected immediately after the drying of the insulating coil 1 is completed.
[0061]
In the impregnation step, when impregnating the resin in the insulating coil housed in the container, the resin is injected from the lower part of the container, and the resin injection speed is set to be equal to or lower than the speed at which the resin penetrates into the insulator.
[0062]
For example, in FIGS. 3 and 5, a predetermined amount of impregnated resin having a temperature lower than the resin curing temperature is injected into the stirring deaerator 26, the vacuum valve 32b is opened, and vacuuming is performed simultaneously with stirring, so that the resin is sufficiently obtained. Defoam. Then, the vacuum valve 32b is closed, and the valve 32a is opened to supply nitrogen gas to the stirring deaerator 26, thereby increasing the pressure in the stirring deaerator 26 to near atmospheric pressure. Thereafter, the resin injection valve 32e at the lower part of the stirring deaerator 26 is opened, the resin is injected from the lower part of the insulating coil 1 at a predetermined injection speed, and the insulating coil 1 is evacuated from the upper part to insulate it. The resin impregnation of the coil 1 is performed.
[0063]
Here, the temperature in the thermostatic chamber 25 is preferably set to a temperature as high as possible that is equal to or lower than a temperature at which the reaction of the resin does not start. This is because as the temperature of the resin increases, the viscosity of the resin decreases and impregnation into the insulating coil 1 proceeds faster. On the other hand, if the temperature exceeds the temperature at which the reaction of the resin starts, gelation of the resin is promoted and the viscosity of the resin increases. Therefore, it is necessary to set the temperature below the temperature at which the reaction of the resin does not start.
[0064]
When the resin is injected from the lower part of the insulating coil 1, the injection amount of the resin into the pressure vessel 24 is set so that the injection rate of the resin into the pressure vessel 24 is slower than the penetration rate of the resin into the insulating coil 1. Control. When the injection rate of the resin is faster than the penetration rate of the resin, the resin permeates the unimpregnated portion of the resin and the unimpregnated portion is covered with the resin. In such a state, the remaining air in the unimpregnated portion is difficult to escape, and the possibility that voids are generated in the insulating coil 1 increases. Therefore, the impregnation of the insulating coil 1 is advanced by making the resin injection speed slower than the resin infiltration speed and expelling the air present in the insulating coil 1 by the resin infiltration, so that the voids of the insulating coil 1 are increased. Occurrence can be suppressed.
[0065]
FIG. 6 is a cross-sectional view showing a resin injection method in an impregnation process according to an embodiment of the present invention. Here, FIG. 6A shows a case where the resin is injected so that the injection rate of the resin into the pressure vessel 24 is slower than the penetration rate of the resin into the insulating coil 1. In FIG. 6A, when the unimpregnated resin 51 of the stirring deaerator 26 is injected from the lower part of the pressure vessel 24, resin impregnation proceeds from the bottom to the top of the insulating coil 1, and the insulating coil 1 The impregnating resin 52 penetrates. Here, the injection amount of the unimpregnated resin 51 is controlled so that the resin liquid surface 51 a of the unimpregnated resin 51 is lower than the impregnated surface 52 a of the impregnated resin 52. Accordingly, it is possible to advance the impregnation of the insulating coil 1 while expelling the bubbles 54 existing in the unimpregnated portion 53 of the insulating coil 1, and it is possible to suppress the generation of voids in the insulating coil 1.
[0066]
On the other hand, FIG. 6B shows a case where the resin is injected so that the resin injection speed into the pressure vessel 24 is faster than the resin penetration speed into the insulating coil 1. In FIG. 6 (b), when the unimpregnated resin 51 is injected from the lower part of the pressure vessel 24 and the resin liquid surface 51 a of the unimpregnated resin 51 is above the impregnated surface 52 a of the impregnated resin 52, the unimpregnated portion 53. The impregnation of the resin into the resin proceeds from the entire periphery of the non-impregnated portion 53. For this reason, the non-impregnated portion 53 is surrounded by the impregnated resin 52, and there is no escape space for the bubbles 54 existing in the non-impregnated portion 53. For this reason, the bubbles 54 are confined in the insulating coil 1, and voids are generated in the insulating coil 1.
[0067]
Further, the insulating coil is impregnated with resin in a vacuum, and when the resin liquid level reaches a predetermined position in the resin storage tank above the insulating coil, the vacuum is broken to normal pressure or pressurization. After a predetermined time has elapsed, the vacuum is again applied. Thus, voids are minimized by repeating vacuum and normal pressure or pressurization multiple times.
[0068]
For example, in FIG. 3 and FIG. 5, until the impregnation from the lower part of the insulating coil 1 has passed the scheduled time for reaching the entire insulating coil 1, until the resin liquid level 51 a reaches a predetermined height of the resin storage tank 27. Inject resin. And the vacuum pump 29 is stopped | fastened and the pressure in the resin storage tank 27 is made into atmospheric pressure. At this time, compared with the case where the resin storage tank 27 is evacuated, the wettability of the resin into the insulating coil 1 is improved, and the impregnation of the resin into the insulating coil 1 proceeds. Thereafter, evacuation of the resin storage tank 27 is performed again, and the resin is injected until the resin liquid level 51 a reaches a predetermined height of the resin storage tank 27 while defoaming the resin impregnated in the insulating coil 1. . This operation is repeated a predetermined number of times.
[0069]
FIG. 7 is a sectional view showing a resin impregnation method in an impregnation step according to an embodiment of the present invention. In FIG. 7A, when the resin liquid level 51 a reaches a predetermined height of the resin reservoir 27, the pressure in the pressure vessel 24 is introduced by introducing nitrogen gas into the stirring deaerator 26 and the resin reservoir 27. To increase. Thereby, the wettability of the resin 51 to the insulating coil 1 is improved, and the impregnation of the resin 51 into the insulating coil 1 further proceeds.
[0070]
Next, by evacuating the agitation deaerator 26 and the resin storage tank 27, the resin liquid surface 51 a has a predetermined height of the resin storage tank 27 while degassing the resin 51 impregnated in the insulating coil 1. Resin 51 is injected until
[0071]
Here, in the VPI impregnation method which is generally widely used, the insulating coil 1 is vacuum-dried, and the resin is injected while maintaining the vacuum state. The resin in the vacuum state does not so much impregnate the insulating layer. On the other hand, when the vacuum is broken and switched to pressurization, the resin suddenly impregnates due to the difference from the internal pressure. However, since the gas remains in the resin in the pressurized state, voids are generated. Therefore, the resin is impregnated while repeating vacuuming and normal pressure or pressurization. This makes it possible to improve wettability while minimizing voids and improve impregnation.
[0072]
In the curing step, pressure is applied from the stirring defoamer and the resin storage tank to cure the impregnated resin under a predetermined temperature condition. At this time, at least until the resin impregnated in the coil insulating layer starts to gel, the resin injection pipe into the thermostatic bath and the pipe from the pressure vessel to the resin reservoir are cooled below the temperature of the insulating coil.
[0073]
For example, in FIGS. 3 and 5, the vacuum valves 32 b and 32 c are closed and the valves 32 a and 32 d are opened while the pipes 33 a and 33 b are cooled, so that the stirring deaerator 26 and the resin storage tank 27 are filled with nitrogen. Introduce gas. Thereby, the pressure in the stirring deaerator 26 and the resin storage tank 27 is increased. And in the state which cooled piping 33a, 33b, the temperature of the thermostat 24 is raised to the hardening temperature of resin, and hardening of resin is implemented for predetermined time.
[0074]
FIG. 8 is a cross-sectional view illustrating a resin curing method in a curing process according to an embodiment of the present invention. In FIG. 8, when the impregnation step is completed, the inside of the stirring deaerator 26 and the resin storage tank 27 is pressurized by introducing nitrogen gas into the stirring deaerator 26 and the resin storage tank 27. Further, the insulating coil 1 is heated and the pipes 33a and 33b are cooled. As a method of heating the insulating coil 1, in addition to a method of increasing the temperature of the thermostatic chamber 24, a method of passing a current through the superconducting wire 12 of the insulating coil 1 or a heater installed in the insulating coil 1. A method of heating the insulating coil 1 may be used.
[0075]
Here, by applying pressure to the resin 51, the volume of the gas remaining in the insulating coil 1 can be reduced, and the void is reduced by curing the resin while maintaining this state. be able to.
[0076]
Also, the higher the temperature of the resin, the shorter the curing time, and the volume shrinks with curing. Therefore, the temperature of the impregnated resin 52 that has penetrated into the insulating coil 1 is increased to promote the resin reaction, and the temperature of the unimpregnated resin 51 outside the insulating coil 1 is decreased to suppress the resin reaction. Accordingly, the curing of the resin 52 inside the insulating coil 1 proceeds faster than the resin 51 outside the insulating coil 1. This makes it possible to cure the impregnating resin 52 inside the insulating coil 1 while maintaining the fluidity of the unimpregnated resin 51 outside the insulating coil 1, and as the impregnating resin 52 inside the insulating coil 1 shrinks. The resin can be cured while supplementing the created space with the unimpregnated resin 51 outside the insulating coil 1. As a result, generation of voids due to curing of the impregnating resin 52 impregnated in the insulating coil 1 can be suppressed.
[0077]
In the mold release step, after the resin is cured, the entire insulating coil 1 is cooled to room temperature, and the insulating coil 1 is taken out from the pressure vessel 24. Then, the unimpregnated resin 51 fixed to the side surface of the insulating coil 1 is peeled off at the part of the release layer 18.
[0078]
Thus, in the above-described embodiment, in the method of impregnating the insulating coil 1 with resin, the insulating coil 1 is housed in the mold or pressure vessel 24 equipped with the temperature control device 31c, or the temperature-controlled bath 25 capable of adjusting the temperature. Store in. In addition to the temperature control device 31c for controlling the temperature of the thermostatic bath 25, the temperature control devices 31a and 31b are provided with the resin dewatering tank 27 and a plurality of pipes 33a and 33b for resin impregnation. Are provided separately so that the temperature of the pipes 33 a and 33 b can be controlled independently of the temperature of the thermostatic chamber 25. Then, impregnation is performed by a resin impregnation apparatus connected to a vacuum pump 29, and after completion of the impregnation, the pressure is switched to normal pressure or pressurization to adjust the temperature in the thermostatic chamber 25 to cure the resin.
[0079]
This makes it possible to adjust the temperature for each element device, and since it is possible to select the optimum conditions according to the viscosity and working life of the impregnating resin, it is possible to set the impregnation conditions that minimize the voids. .
[0080]
In the embodiment described above, when the insulating coil 1 is installed in the pressure vessel 24, a gap is formed between the insulating coil 1 and the pressure vessel 24, and this gap is also filled with resin. For this reason, the resin is wastefully consumed by the gap formed between the insulating coil 1 and the pressure vessel 24. Therefore, this gap is filled with padding in advance, and then the resin is injected. As a result, it is possible to reduce the amount of resin injected into the pressure vessel 24 by the volume of the padding grass, and the resin corresponding to the volume of the padding grass can be saved. Here, as the padding grass, a plastic molded product or a small particle chip which does not react with the resin and has a releasability with the resin can be used.
[0081]
FIG. 9 is a cross-sectional view showing a resin impregnation method using padding according to an embodiment of the present invention. In FIG. 9, when the insulating coil 1 is housed in the pressure vessel 24 with a lid, the padding grass 62 is inserted into a horizontal space excluding the upper and lower sides of the insulating coil 1. Here, the material of the padding grass 62 is preferably one that does not affect the reaction of the resin 51 and that has releasability from the resin 51. For example, as the material of the padding grass 62, polyethylene, polypropylene, polyamide, Teflon, or the like is suitable. From the viewpoint of cost and convenience, polyethylene is most suitable.
[0082]
Here, when the resin 51 is poured into the pressure vessel 24, buoyancy is generated in the padding grass 62, and a force that moves the padding grass 62 upwards acts. Therefore, the movement of the padding grass 62 can be suppressed by using spacers, seals, nets, or the like that can pass the resin 51 that is liquid but cannot pass the padding grass 62. For example, by arranging nets 61 a and 61 b having a mesh smaller than the padding grass 62 at the upper and lower boundaries of the insulating coil 1, the padding grass 62 is prevented from entering above and below the insulating coil 1.
[0083]
When the padding grass 62 and the nets 61 a and 61 b are arranged in the pressure vessel 24, the resin 51 is injected from below the pressure vessel 24. Here, since the padding grass 62 is disposed in the pressure vessel 24, it is possible to reduce the amount of resin consumption corresponding to the volume of the padding grass 62.
[0084]
When the impregnation resin 52 is completely impregnated and cured in the insulating coil 1, the entire insulating coil 1 is cooled to room temperature, and the insulating coil 1 is taken out from the pressure vessel 24. Then, the resin 51 fixed to the side surface of the insulating coil 1 is peeled off. Here, since the resin 51 fixed to the side surface of the insulating coil 1 is filled with the padding grass 62, the resin 51 can be easily peeled from the insulating coil 1.
[0085]
Thus, when the insulated coil 1 subjected to the release treatment is stored in the mold or the pressure vessel 24, the waste grass 62 is filled with the filling grass 62 that does not react with the resin. As a result, the amount of resin used can be reduced, and the resin 51 fixed to the side surface of the insulating coil 1 can be easily and efficiently disassembled. Further, since the filling amount of the resin 51 in the pressure vessel 24 is reduced, it is possible to reduce the non-uniformity of the curing temperature due to the reaction heat when the resin 51 is cured, and to improve the quality of the insulating coil 1. Is possible.
[0086]
Hereinafter, a specific example in which the superconducting coil is impregnated with resin will be described. 1 to 9, a large superconducting coil in which a conduit type superconducting wire 12 is wound around a solenoid is used as the insulating coil 1 installed in the pressure vessel 24. For the insulating layer 14 of the superconducting wire 12, a laminated tape and a glass tape in which a polyimide film and a glass tape are bonded together were used. The glass tape 14a was wound in 1/2 layers on the innermost layer, and the laminated tape 14b was wound in 1/2 layers from the second layer to form four layers. The interlayer insulation layers 16 and 17 of the solenoids 19a and 19b are ½ wrapped to have three layers, and the outermost ground insulating layer 15 of the insulating coil 1 is ½ lap to have 10 layers. Further, a Teflon tape was wound once by quarter lap winding as the release layer 18 outside the ground insulating layer 15. Glass tape spacers 15b to 17b were inserted vertically into the interlayer insulating layers 16 and 17 and the ground insulating layer 15 of the solenoids 19a and 19b at appropriate intervals. The insulating coil 1 includes element parts that form a normal coil, such as the configuration of the lead-out portion 2 and the use of FRP for upper and lower pressers.
[0087]
The insulating coil 1 was housed in a pressure vessel 24 with a lid, and a high-density polyethylene chip having a diameter of 3 mm and a length of about 5 mm was inserted as a grass 62 in a horizontal space excluding the upper and lower sides of the insulating coil 1. Further, fine meshes 61 a and 61 b are arranged at the upper and lower boundaries of the insulating coil 1 so that the padding 62 does not enter the upper and lower sides of the insulating coil 1. A capacitance-type liquid level gauge 22 and a resistance-type impregnation position detector 23 are arranged beside the insulating coil 1 at essential points. The entire pressure vessel 24 was placed in the thermostat 25, and the pipes 33a and 33b through which the resin connected to the pressure vessel 24 passes could be cooled with water. The resin stirring and defoaming machine 26 is placed at a position higher than the pressure vessel 21, and valves 32a, 32b and 32e are arranged above and below. The resin storage tank 27 at the upper part of the pressure vessel 24 is a vessel arranged for compensating for the curing shrinkage of the resin.
[0088]
Before the resin impregnation, the temperature in the thermostatic chamber 24 was raised, the temperature of the insulating coil 1 was set to 120 ° C., and vacuum drying was performed for 24 hours. Then, the temperature in the thermostat 24 was lowered, the temperature of the insulating coil 1 was adjusted to 60 ° C. ± 5 ° C., and this temperature was maintained until the impregnation was completed.
[0089]
At the time of resin impregnation, a predetermined amount of impregnated resin at 60 ° C. was poured into the stirring deaerator 26 at 60 ° C., and vacuum was drawn simultaneously with stirring to sufficiently defoam. Next, the vacuum valve 32 b is closed, the valve 32 a is opened to supply nitrogen gas to the stirring deaerator 26, the pressure in the stirring deaerator 26 is increased to near atmospheric pressure, The resin injection valve 32e was opened, and impregnation was performed from below the insulating coil 1 at a predetermined injection speed. The impregnation proceeded by repeating this stirring and injection. Here, the measured value of the liquid level gauge 22 and the impregnation speed confirmed in the preliminary experiment are set so that the rise of the resin liquid level 51a in the pressure vessel 24 does not become faster than the impregnated surface 52a in the insulator of the insulating coil 1. The injection amount was adjusted with reference.
[0090]
Resin was injected until the resin liquid level 51a reached a predetermined height in the resin reservoir 27 after a predetermined time when the impregnation from the lower part of the insulating coil 1 spread over the entire insulating coil 1. Thereafter, the vacuum pump 29 was stopped, and the pressure in the resin storage tank 27 was set to atmospheric pressure. At this time, the insulation coil 1 was further impregnated. The inside of the resin storage tank 27 was again evacuated, and the resin was injected until the resin liquid level 51a reached a predetermined height of the resin storage tank 27. This operation was repeated three times.
[0091]
Thereafter, the piping 33a and 33b are cooled, the system of the vacuum pump 29 is disconnected, and nitrogen gas is introduced into the agitation deaerator 26 and the resin storage tank 27. The pressure in the storage tank 27 was raised to 0.7 MPa. In this state, the temperature of the thermostat 24 was raised, and the resin was cured at 120 ° C. for a predetermined time. As the resin gelled and cured, the curing and shrinkage of the impregnated resin 52 in the insulating coil 1 began, the resin liquid level 51a of the resin reservoir 27 was lowered, and a result almost in agreement with the calculated predicted value was obtained. After the curing shrinkage of the resin was stabilized, the cooling of the pipes 33a and 33b was stopped, and adjustment was made so that the degree of curing of the resin of the entire insulating coil 1 was uniform.
[0092]
After the resin was cured, the entire insulating coil 1 was cooled to room temperature, and the insulating coil 1 was taken out from the pressure vessel 24. The resin 51 fixed to the side surface of the insulating coil 1 can be easily peeled off because the resin 51 fixed to the side surface of the insulating coil 1 is filled with the padding grass 62. In addition, the consumption of the resin 51 corresponding to the volume of the padding grass 62 can be reduced. For this reason, the insulation coil 1 can be easily formed, and it has a great effect on cost reduction as well as cost reduction.
[0093]
In addition, the high voltage corona characteristics for determining the presence or absence of voids are also good, and since the resin injection consistent with the calculation prediction was performed, it is possible to minimize voids and the time required for resin impregnation I was able to shorten it.
[0094]
Hereinafter, experimental examples for confirming the impregnation rate of the present invention will be described. FIG. 10 is a cross-sectional view showing the configuration of an experimental apparatus for resin impregnation according to an experimental example of the present invention.
[0095]
10A, an acrylic outer cylinder 71, an acrylic intermediate inner cylinder 72, and an acrylic inner cylinder 73 configured in three layers of concentric circles are provided, and an acrylic upper lid is provided above and below the acrylic outer cylinder 71. 74 and a bottom plate 75 are provided. A vacuum pump connection exhaust port 76 is provided in the acrylic upper lid 74, and a resin injection port 77 is provided below the acrylic outer cylinder 71. The acrylic outer cylinder 71 and the acrylic intermediate inner cylinder 72 are sealed by a rubber ring 78, and an impregnated insulating layer 79 is provided between the acrylic intermediate inner cylinder 72 and the acrylic inner cylinder 73. Further, a notch 79 serving as a resin passage is formed in the lower portion of the acrylic intermediate cylinder 72. Here, the outer diameter W1 of the acrylic inner cylinder 73 is 90φ, and the height H1 of the acrylic intermediate inner cylinder 72 is 1 m.
[0096]
10B, an acrylic outer cylinder 81 and an acrylic inner cylinder 82 configured in two concentric layers are provided, and an acrylic upper lid 83 and a bottom plate 84 are provided above and below the acrylic outer cylinder 81. ing. The acrylic upper lid 83 is provided with a vacuum pump connection exhaust port 85, and a resin injection port 86 is provided below the acrylic outer cylinder 81. An impregnated insulating layer 87 is provided around the acrylic inner cylinder 82. Here, the outer diameter W2 of the acrylic inner cylinder 82 is 450φ, and the height H2 of the acrylic inner cylinder 82 is 1 m.
[0097]
As a comparative example, a configuration without the acrylic intermediate cylinder 72 of FIG. The impregnated insulating layer 79 is a three-layer insulating tape in which a glass tape is attached to the back and front of a polyimide tape with a small amount of adhesive, and this insulating tape is wound on an acrylic inner cylinder 73 and wrapped in four layers. It was. Further, a Teflon tape was wound on the outside of the insulating tape in a quarter layer.
[0098]
When the setting was completed, the vacuum pump connection exhaust port 76 of the acrylic upper lid 74 was connected to the vacuum pump, and the resin was injected from the resin injection port 77 while evacuating the acrylic outer cylinder 71. Here, the resin injection amount was adjusted so that the liquid level of the injected resin was about 50 to 100 mm higher than the impregnated surface of the resin. The impregnation rate was measured visually using a scale set in advance.
[0099]
As Experimental Example 1, the configuration shown in FIG. The impregnated insulating layer 79 is a three-layer insulating tape in which a glass tape is attached to the back and front of a polyimide tape with a small amount of adhesive, and this insulating tape is wound on an acrylic inner cylinder 73 and wrapped in four layers. It was. An acrylic intermediate cylinder 72 with one slit was put on the outside, and the acrylic intermediate cylinder 72 was tightened with an appropriate compressive force, and the slit portion of the acrylic intermediate cylinder 72 was sealed. The acrylic intermediate cylinder 72 was placed in an acrylic outer cylinder 71, and the space between the acrylic intermediate cylinder 72 and the acrylic outer cylinder 71 was sealed with a rubber ring 78.
[0100]
When the setting was completed, the vacuum pump was connected to the vacuum pump connection exhaust port 76 using the acrylic outer cylinder 71 as a vacuum container. In addition, an impregnation resin container was connected to the resin injection port 77 through a valve and a hose. Then, while evacuating the acrylic outer cylinder 71, the resin was injected from the resin injection port 77, and the impregnation rate was measured visually with a scale set in advance. Here, the resin injection amount was adjusted so that the liquid level of the injected resin was about 50 to 100 mm higher than the impregnated surface of the resin. The inside of the acrylic outer cylinder 71 was kept at 0.5 Torr or less with the surface of the resin to be injected at atmospheric pressure. Therefore, a differential pressure of 0.1 MPa acts on the impregnated insulating layer 79.
[0101]
Experimental Example 2 used the same configuration as that of the comparative example, but instead of the acrylic inner cylinder 73 around which the insulating tape was wound, an iron inner cylinder was used. Further, before impregnation with the resin, the insulating layer 79 to be impregnated was dried by heating at 130 ° C. for 10 hours, and then quickly assembled and an impregnation experiment was conducted. The other conditions are the same as in the comparative example.
[0102]
In Experimental Example 3, the same configuration as that of the comparative example was used, but ceramic paper having a thickness of 0.2 mm, a width of 18 mm, and a length of 1 m was inserted as a spacer between the layers of the impregnated insulating layer 79. Here, two pieces are inserted into the first layer at the positions of 0 ° and 180 °, and two pieces are inserted into the next layer at the positions of 90 ° and 270 °. Inserted. The other conditions are the same as in the comparative example.
[0103]
Experimental Example 4 differs from Experimental Example 3 only in the material of the spacer, and a glass tape having the same dimensions was used instead of ceramic paper.
[0104]
Experimental Example 5 differs from Experimental Example 3 only in the material of the spacer, and glass epoxy FRP having the same dimensions was used instead of ceramic paper.
[0105]
In Experimental Example 6, the insulating tape having the three-layer structure used in Experimental Example 1 was wound around the acrylic inner cylinder 82 having the configuration shown in FIG. 10B four times in half laps, and a glass tape was inserted as a spacer. The other conditions were the same as in Experimental Example 2.
[0106]
In Experimental Example 7, the same configuration as in Experimental Example 6 was used, and the amount of resin injected was adjusted so that the liquid level of the impregnating resin was about 300 mm higher than the impregnated surface. The other conditions were the same as in Experimental Example 6.
[0107]
In Experimental Example 8, the same configuration as in Experimental Example 7 was used, and impregnation was performed by adjusting all of the impregnated insulating layer 87, the container, and the impregnated resin to 55 ° C. The other conditions were the same as in Experimental Example 7.
[0108]
In Comparative Examples and Experimental Examples 2 to 8, the acrylic intermediate inner cylinder 72 is not provided. However, the impregnated insulating layer 87 and the impregnated resin are separated by Teflon tape, and the Teflon tape lap is Since the resin does not penetrate into the impregnated insulating layer 87, the impregnated resin is injected from below the impregnated insulating layers 79 and 87.
[0109]
The experimental results of the comparative example and the experimental examples 1 to 8 described above are shown in the following table.
[0110]
[Table 1]

[0111]
In the above table, the impregnation speed of the comparative example is 30 mm / h, whereas the impregnation speed of the experimental example 1 is 330 mm / h. Here, a pressure difference acts on the impregnated insulating layer 79 in Experimental Example 1, but no pressure difference acts on the impregnated insulating layer 79 in the comparative example. As a result, it was shown that when the pressure difference acts on the insulating layer 79 to be impregnated, the impregnation speed becomes very fast.
[0112]
Further, the impregnation speed of the comparative example is 30 mm / h, whereas the impregnation speed of the experimental example 2 is 110 mm / h. Here, in Experimental Example 2, the impregnated insulating layer 79 is dried before impregnation, but in the comparative example, the impregnated insulating layer 79 is not dried before impregnation. As a result, it was shown that when the impregnated insulating layer 79 is dried, the impregnation speed is increased.
[0113]
The impregnation speed of the comparative example is 30 mm / h, whereas the impregnation speeds of Experimental Examples 3 to 5 are 40 mm / h, 52 mm / h, and 60 mm / h, respectively. Here, in Experimental Examples 3 to 5, the spacer is inserted in the impregnated insulating layer 79, but in the comparative example, the spacer is not inserted in the impregnated insulating layer 79. As a result, it was shown that when a spacer was inserted into the impregnated insulating layer 79, the impregnation rate was increased. It was also shown that the difference in spacer material has a slight effect on the impregnation rate.
[0114]
Further, the impregnation speed in Experimental Example 2 is 110 mm / h, whereas the impregnation speed in Experimental Example 6 is 70 mm / h. Here, in Experimental Example 6, a spacer is inserted in the impregnated insulating layer 79, but in Experimental Example 2, no spacer is inserted in the impregnated insulating layer 79. In Experimental Example 6, the curvature of the impregnated insulating layer 79 is smaller than that in Experimental Example 2. As a result, when the size of the impregnated insulating layer 79 is increased, the impregnation rate is decreased, and when the curvature of the impregnated insulating layer 79 is decreased, the insertion of the spacer does not contribute much to the improvement of the impregnation rate. It was.
[0115]
In addition, the impregnation speed in Experimental Example 6 is 70 mm / h, whereas the impregnation speed in Experimental Example 7 is 95 mm / h. Here, in Experimental Example 7, the difference between the liquid level of the resin and the impregnated surface of the impregnated insulating layer 79 is larger than that of Experimental Example 7. As a result, it was shown that the impregnation speed increases as the difference between the liquid level of the resin and the impregnated surface of the impregnated insulating layer 79 increases.
[0116]
In addition, the impregnation speed in Experimental Example 7 is 95 mm / h, whereas the impregnation speed in Experimental Example 8 is 210 mm / h. Here, in Experimental Example 8, the viscosity of the resin is smaller than in Experimental Example 7. As a result, it was shown that the impregnation rate was increased when the viscosity of the resin was decreased.
[0117]
As described above, it has been clarified that the impregnation rate is affected by drying, a spacer, a head difference on the resin surface, a pressure difference applied to the insulator, a resin viscosity, and the like.
[0118]
In Experimental Example 9, after impregnating the resin with the same insulating configuration as in Experimental Example 4 and infiltrating the resin to about 50 cm, the injection resin speed was rapidly increased, and the resin surface was above the upper end of the impregnated insulating layer 79. I tried to make it. Thereafter, the vacuum pump was stopped and the inside of the acrylic outer cylinder 71 was gradually returned to atmospheric pressure. By this operation, resin impregnation from the upper part penetrated about 40 mm in about 3 minutes. As a result, it was shown that the impregnation speed was increased by repeating vacuum and atmospheric pressure.
[0119]
In Experimental Example 10, experiments using the capacitance method and the resistance method were performed. In the electrostatic capacity method, two 30 mm wide and 2 mm thick FRP plates are made to face each other, aluminum tape is pasted on the inner surface of the FRP plate, and a 5 mm gap piece is sandwiched at an appropriate position on the FRP plate. Electrode. This capacitance method is suitable for continuous measurement in which the capacity gradually increases as the liquid level rises.
[0120]
In the resistance method, the end of an insulated wire having a diameter of 1 mmφ was bare about 10 mm, arranged in parallel with a width of 10 mm, and fixed to the FRP plate. In this resistance method, the resistance value of the region soaked in the impregnated resin changes by 3 to 4 digits compared to the unimpregnated dry region. For this reason, in the resistance method, it is possible to accurately measure the presence or absence of the impregnating resin. Therefore, it can be effectively used for a limiter or liquid level control using two.
[0121]
As described above, according to the above-described embodiments, spacers, drying, impregnation liquid level, pressure difference, viscosity, etc. are effectively applied to a hardly impregnated insulating layer including a dense insulator and film. By taking in and impregnating from the lower part of the coil, impregnation insulation with less voids can be performed. Furthermore, it is possible to further reduce voids by promoting impregnation due to pressure changes in the final impregnation process and by pressure curing, and at the time of gelation by cooling the resin injection pipes provided before and after the insulating coil. It is possible to compensate for the curing shrinkage of the resin, which is effective in further reducing voids and suppressing the occurrence of cracks.
[0122]
Furthermore, by filling padding such as polyethylene, which is less expensive than impregnating resin, it is possible to contribute to the reduction of product price, while suppressing heat generation during curing and shortening work time during molding. Also has an excellent effect.
[0123]
In general, in the case of a superconducting coil, a strong electromagnetic force works during operation, and it is required that the superconducting wire is normally fixed against the electromagnetic force. For this reason, the winding tension of the coil becomes very high, and the superconducting wire often has a strong compressive force applied to the insulator. Since it takes a very long time to impregnate such an insulating coil, a contrivance is required for the impregnation. Therefore, by applying the above impregnation method to a superconducting coil, impregnation with less voids can be performed in a short time, and the effect is great.
[0124]
【The invention's effect】
As described above, according to the insulating coil of the present invention, even when the interlayer insulating layer of the insulating coil is composed of an insulator subjected to a strong compressive force or a high-density insulator, It is possible to efficiently infiltrate the resin into the resin, and it is possible to shorten the time required for the resin impregnation.
[0125]
In addition, according to the impregnation apparatus of the present invention, it is possible to prevent the unimpregnated portion of the resin in the insulating coil from being surrounded by the impregnated resin and block the air escape path existing in the unimpregnated portion, It becomes possible to suppress the generation of voids impregnated with resin.
[0126]
In addition, the impregnation resin can be performed while applying pressure proportional to the specific gravity and height of the resin to the insulating coil, and the impregnation speed can be improved.
[0127]
In addition, the height of the resin surface in which the insulating coil is immersed can be controlled to be equal to or lower than the resin impregnated surface of the insulating coil, and generation of voids during resin impregnation can be suppressed.
[0128]
Further, it is possible to perform the impregnation while expelling the air present in the insulating coil along the resin impregnation direction, and it is possible to suppress the generation of voids during the resin impregnation.
[0129]
In addition, it is possible to perform resin impregnation while satisfying both the requirements of suppression of voids by evacuation and improvement of impregnation speed by pressurization, and it is not necessary to sacrifice one of them, so voids are minimized. It is possible to improve the impregnation speed while pressing.
[0130]
Further, it is possible to continuously measure the resin liquid surface and the impregnated surface and improve the measurement accuracy.
[0131]
Further, according to the curing device of the present invention, it is possible to accelerate the curing of the resin that does not contribute to the resin supply, and to delay the curing of the resin that contributes to the resin supply, and to reduce the shrinkage resin during the curing. Since the resin can be cured while being supplied to the contracted portion, generation of voids during the curing can be suppressed.
[0132]
In addition, it is possible to prevent the resin supply path to the insulating coil from being cut off, and it is possible to proceed with the resin curing while supplying the resin for shrinkage during curing into the insulating coil. It is possible to suppress the generation of voids during curing.
[0133]
Further, according to the impregnation method of the present invention, it is possible to reduce the amount of resin used by the volume of the padding, and it is possible to easily remove the resin fixed around the insulating coil, Costs can be reduced and workability can be improved. Moreover, since the filling amount of the resin is reduced, it is possible to reduce the non-uniformity of the curing temperature due to the reaction heat at the time of curing the resin, and it is possible to improve the quality of the insulating coil.
[0134]
Further, it is possible to prevent the filling grass from moving when the resin is injected and clogging the resin delivery pipe.
[0135]
In addition, it is possible to suppress deformation and distortion due to the difference in thermal expansion of the insulating material of the insulating coil, and it is possible to immediately inject resin into the insulating coil from the end of drying of the insulating coil.
[Brief description of the drawings]
FIG. 1 is a cutaway external view showing a schematic configuration of an insulating coil according to an embodiment of the present invention.
2 (a) is an enlarged view of a portion A in FIG. 1, and FIG. 2 (b) is an enlarged view of a superconducting winding.
FIG. 3 is a block diagram showing a schematic configuration of a resin impregnated coil manufacturing apparatus according to an embodiment of the present invention.
FIG. 4 is a side view showing a schematic configuration of an impregnation position detector according to an embodiment of the present invention.
FIG. 5 is a time chart showing manufacturing conditions for each step of a resin-impregnated coil according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a resin injection method in an impregnation process according to an embodiment of the present invention.
FIG. 7 is a sectional view showing a resin impregnation method in an impregnation step according to an embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a resin curing method in a curing process according to an embodiment of the present invention.
FIG. 9 is a cross-sectional view showing another example of a resin impregnation method according to an embodiment of the present invention.
FIG. 10 is a cross-sectional view showing a configuration of an experimental apparatus for resin impregnation according to an experimental example of the present invention.
[Explanation of symbols]
1 Insulation coil
2a, 2b
11 Helium delivery tube
12 Superconducting winding
13 conduit
14 Winding insulation layer
14a, 15a-17a Glass tape
14b Laminating tape
15 Ground insulation layer
16, 17 Interlayer insulation layer
15b-17b Spacer
15c-17c gap
18 Release layer
19a, 19b Solenoid
22 Level gauge
23 Impregnation position detector
24 Pressure vessel
25 Thermostatic bath
26 Stirring deaerator
27 Resin reservoir
28, 30 Pressure control device
29 Vacuum pump
31a-31c Temperature control device
32a to 32e valve
41a, 41b Lead wire
42a, 42b Metal conductor
43a-43c fixed plate
71, 81 Acrylic outer cylinder
72 Acrylic intermediate inner cylinder
73, 82 Acrylic inner cylinder
74, 83 Acrylic top lid
75, 84 Bottom plate
76, 85 Vacuum pump connection exhaust port
77, 86 Resin inlet
78 Rubber seal
79, 87 Impregnated insulation layer

Claims (7)

  A vacuuming means for evacuating the resin that immerses the insulating coil, a pressure control means for controlling the pressure applied to the resin, and a switching control between the pressure control of the resin and the evacuation when the insulating coil is impregnated are repeatedly performed. An impregnation apparatus comprising a switching control means. The impregnation apparatus according to claim 1 , further comprising: a liquid level gauge using a capacitance method or a resistance method; and an impregnation position detector using a capacitance method or a resistance method.   An impregnation method comprising impregnating a resin while repeatedly evacuating the resin and controlling the pressure of the resin when the insulating coil is impregnated. 4. The impregnation method according to claim 3 , wherein the resin is impregnated after the padding which does not react with the resin and has releasability is disposed around the insulating coil. The impregnation method according to claim 4 , wherein the filling grass is confined within a predetermined range by using a fixing unit that allows the resin to pass therethrough and does not allow the filling grass to pass therethrough. 6. The impregnation method according to claim 4 , wherein the insulating coil is dried at a temperature equal to or lower than a curing temperature of the resin before impregnation with the resin. An insulating coil obtained by using the impregnation method according to any one of claims 4 to 6 .

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