JP3892605B2

JP3892605B2 - Superconducting coil device for current limiting element

Info

Publication number: JP3892605B2
Application number: JP36897498A
Authority: JP
Inventors: えり子米田; 俊自野村; 守嶋田; 正道河合; 高太郎浜島
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 1998-12-25
Filing date: 1998-12-25
Publication date: 2007-03-14
Anticipated expiration: 2018-12-25
Also published as: JP2000197263A

Description

【０００１】
【発明の属する技術分野】
この発明は、交流電路における過電流を抑制する限流器に使用できる限流素子用超電導コイル装置に関するものである。
【０００２】
【従来の技術】
例えば、特開平２−２０２３２０号公報に示された超電導コイル装置による限流器は、電流を制限以下に抑えるインダクタンスを有しかつ制限値以上の臨界電流値をもつ超電導限流コイルと、その制限値より小さく通常電流より大きい臨界電流値をもち並列に接続された第１の超電導コイルと第２の超電導コイルとが互いに無誘導に巻かれて成された超電導トリガコイルと、この超電導トリガコイルに直列に接続された復帰用スイッチとから構成されている。これらのコイルはソレノイド構成であり、クライオ容器内に設置され冷媒中に浸漬されて運転される。
【０００３】
次に動作について説明する。通常は、通常電流より大きい臨界電流値を持ち抵抗零で無誘導に巻かれた超電導トリガコイルを、電流は電圧降下なしで流れる。事故で電路電流が過大になると超電導トリガコイルがクエンチし、抵抗値が増大する。このとき、超電導トリガコイルの抵抗値を超電導限流コイルのインピーダンスより大きくなるように設定しておけば、超電導トリガコイルに流れていた電流は超電導限流コイルに転流し、短絡電流は超電導限流コイルのインピーダンスによって決定される値に限流される。
【０００４】
【発明が解決しようとする課題】
しかしながら、上述したソレノイドコイル構成では、コイル端部で線材に垂直磁界がかかるため、均一に常電導転移せずにコイルが劣化するなどの問題点があった。特に、垂直磁界に対し性能劣化の著しいという異方性をもつ酸化物超電導テープ導体等の線材を用いる場合には、安定に通電できず大きな交流損失が発生するなどの問題点があった。
【０００５】
そこで、本発明の目的は、端部での垂直磁界がほとんど発生しない無誘導超電導コイルを構成することにより、安定に通電でき交流損失が小さく均一に常電導転移できる限流素子用超電導コイル装置を得ることである。
【０００８】
【課題を解決するための手段】
請求項１の発明に係わる限流素子用超電導コイル装置は、超電導線材を巻回した無誘導コイルをクライオ容器内に収容し、大円の円周に沿ってその大円よりも半径が小さい小円が移動してできるトロイド状の領域に、前記大円の円周の方向に進みながら、前記大円の円周の周りを巻かれた第１の超電導線材と、前記第１の超電導線材に沿って巻かれた第２の超電導線材と、を有することを特徴とする。
【０００９】
請求項１の発明に係わる限流素子用超電導コイル装置では、超電導線材をトロイド状に配置して無誘導コイルとすることにより、コイルの磁界を均一に小さくして安定に通電し、交流損失を低減させると共に均一に常電導転移が可能となる。
【００１２】
請求項２の発明に係わる限流素子用超電導コイル装置は、請求項１の発明において、前記第１および第２の超電導線材は同じ長さであることを特徴とする。
【００１３】
請求項２の発明に係わる限流素子用超電導コイル装置では、請求項１の発明の作用に加え、第１および第２の超電導線材は同じ長さなので、通常時のインピーダンスを低減できると共に偏流を防止できる。
【００１４】
請求項７の発明に係わる限流素子用超電導コイル装置は、超電導線材を巻回した無誘導コイルをクライオ容器内に収容し、大円の円周に沿ってその大円よりも半径が小さい小円が移動してできるトロイド状の領域に、前記大円の円周に沿った軸の周りに超電導線材が巻かれた複数のユニットコイルを有することを特徴とする。
【００１５】
請求項７の発明に係わる限流素子用超電導コイル装置では、超電導線材をトロイド状に配置して無誘導コイルとすることにより、コイルの磁界を均一に小さくして安定に通電し、交流損失を低減させると共に均一に常電導転移が可能となることに加え、同一で複数のユニットコイルを等間隔でおくことで巻線が容易に構成でき、ユニット化できるので、劣化がおきた場合に劣化した部分のみの取り替えが容易となる。
【００１８】
請求項３および請求項８の発明に係わる限流素子用超電導コイル装置は、請求項１または請求項２もしくは請求項７の発明において、前記大円に垂直な方向の磁界を印加するための磁界印加コイルを具備することを特徴とする。
【００１９】
請求項３および請求項８の発明に係わる限流素子用超電導コイル装置では、請求項１または請求項２もしくは請求項７の発明の作用に加え、抵抗発生後に強制的に磁界をかけることで、抵抗転移を促進し線材の劣化を防止する。
【００２０】
請求項９の発明に係わる限流素子用超電導コイル装置は、請求項７または請求項８の発明において、前記ユニットコイルが、一層おきに逆向きの電流を流してコイル中心に発生する磁界をゼロにするように構成している２層以上の偶数層のソレノイドコイルで構成していることを特徴とする。
【００２１】
請求項９の発明に係わる限流素子用超電導コイル装置では、請求項７または請求項８の発明の作用に加え、二層以上のソレノイドコイルの一層おきに逆向きに電流を流してコイル中心に発生する磁界をゼロにするので、巻き易く絶縁構成が容易に得られ通常のインピーダンスをより低減できる。
【００２２】
請求項１０の発明に係わる限流素子用超電導コイル装置は、請求項７または請求項８の発明において、前記ユニットコイルが、隣り合う複数の同心のコイルに交互に逆向きの電流が流れるように構成したパンケーキコイルを一段または複数段積層して構成されることを特徴とする。
【００２３】
請求項１０の発明に係わる限流素子用超電導コイル装置は、請求項７または請求項８の発明の作用に加え、パンケーキコイルを一段または複数段積層して形成されたユニットコイルの隣り合う複数の同心のコイルに交互に逆向きの電流を流す構成であるので、コイルを構成し易い。
【００２４】
請求項１１の発明に係わる限流素子用超電導コイル装置は、請求項７ないし請求項１０のいずれかの発明において、前記同心のコイルが３個以上であることを特徴とする。
【００２５】
請求項１１の発明に係わる限流素子用超電導コイル装置では、請求項７ないし請求項１０のいずれかの発明の作用に加え、同心のコイルが３個以上であるので、よりインピーダンスを低減できる。
【００２６】
請求項１２の発明に係わる限流素子用超電導コイル装置は、請求項７ないし請求項１１のいずれかの発明において、前記ユニットコイルが超電導線材を２条以上でかつ偶数条にバイファイラー巻きしたパンケーキコイルを一段または複数段積層してなることを特徴とする。
【００２７】
請求項１２の発明に係わる限流素子用超電導コイル装置では、請求項７ないし請求項１１のいずれかの発明の作用に加え、超電導線材を２条以上でかつ偶数条にバイファイラー巻きしたパンケーキコイルを一段または複数段積層してユニットコイルを構成しているので、線材にねじれる力をかけることがなく、通常のインピーダンスを非常に低減できる。
【００３０】
請求項１３の発明に係わる限流素子用超電導コイル装置は、請求項９の発明において、前記ソレノイドコイルが、熱膨張率が超電導線材のそれ以下である絶縁物の巻枠で構成されていて、その巻枠に超電導線材巾以上の角型溝が彫られており、その溝にそって超電導線材を巻き回してなることを特徴とする。
【００３１】
請求項１３の発明に係わる限流素子用超電導コイル装置では、請求項９の発明の作用に加え、超電導線の動きを抑え、超電導線同士の接触による絶縁破壊による性能劣化から線材を保護できる。
【００３２】
請求項４および請求項１４の発明に係わる限流素子用超電導コイル装置は、超電導線材を巻回した無誘導コイルをクライオ容器内に収容し、超電導線材をトロイド状に配置したことを特徴とする発明において、前記超電導線材と補強材を同時に巻回して構成されることを特徴とする。
【００３３】
請求項４および請求項１４の発明に係わる限流素子用超電導コイル装置では、超電導線材をトロイド状に配置して無誘導コイルとすることにより、コイルの磁界を均一に小さくして安定に通電し、交流損失を低減させると共に均一に常電導転移が可能となることに加え、超電導線材と補強材を同時に巻き回すので、電磁力による性能劣化から線材を保護できる。
【００３４】
請求項５および請求項１５の発明に係わる限流素子用超電導コイル装置は、請求項１ないし請求項３のいずれかまたは請求項７ないし請求項１４のいずれかの発明において、前記超電導線材と絶縁材を同時に巻回して構成されることを特徴とする。
【００３５】
請求項５および請求項１５の発明に係わる限流素子用超電導コイル装置では、超電導線材をトロイド状に配置して無誘導コイルとすることにより、コイルの磁界を均一に小さくして安定に通電し、交流損失を低減させると共に均一に常電導転移が可能となること、および、請求項１ないし請求項３のいずれかまたは請求項７ないし請求項１４のいずれかの発明の作用に加え、絶縁破壊による性能劣化から線材を保護できると共に、補強材を同時に巻き回すので絶縁破壊による性能劣化から線材を保護できる。
【００３８】
請求項６および請求項１６の発明に係わる限流素子用超電導コイル装置は、請求項４または請求項１４の発明において、前記補強材が波状加工されたテープで構成されることを特徴とする。
【００３９】
請求項６および請求項１６の発明に係わる限流素子用超電導コイル装置では、請求項４または請求項１４の発明の作用に加え、補強材が波状加工されたテープであるので、電磁力保持、冷却効果、絶縁対策を一度に得られる。
【００４４】
請求項１７の発明に係わる限流素子用超電導コイル装置は、請求項７ないし請求項１６のいずれかの発明において、前記ユニットコイルが、絶縁物でできた板にレコードの溝状の溝を形成し、その溝に超電導線材を入れて構成することを特徴とする。
【００４５】
請求項１７の発明に係わる限流素子用超電導コイル装置では、請求項７ないし請求項１６のいずれかの発明の作用に加え、ユニットコイルは絶縁物でできた円板のディスク型の溝に超電導線材を入れて構成するので、電磁力保持、冷却効果、絶縁効果を一度に得られる。
【００４６】
請求項１８の発明に係わる限流素子用超電導コイル装置は、請求項７ないし請求項１６のいずれかの発明において、前記ユニットコイルが、絶縁物でできた板にレコードの溝状の溝を形成し、その溝に超電導線材より幅の広い絶縁物製のスペーサを入れ、そのスペーサの上に超電導線材を載せて巻くことを特徴とする。
【００４７】
請求項１８の発明に係わる限流素子用超電導コイル装置は、請求項７ないし請求項１６のいずれかの発明の作用に加え、絶縁物でできた円板のディスク型の溝に超電導線材より幅の広い絶縁物製のスペーサを入れ、そのスペーサの上に超電導線材を載せて巻くので、線材にねじりをかけて劣化させることなく、電磁力保持、冷却効果、絶縁効果を得られる。
【００４８】
請求項１９の発明に係わる限流素子用超電導コイル装置は、請求項７ないし請求項１８のいずれかの発明において、ユニットコイル周囲に共通接続部材を配置し、共通接続部材に各パンケーキコイルからの端子を電気的に接続することを特徴とする。
【００４９】
請求項１９の発明に係わる限流素子用超電導コイル装置では、請求項７ないし請求項１８のいずれかの発明の作用に加え、ユニットコイル周囲に共通接続部材を配置し、共通接続部材に各パンケーキコイルからの端子を電気的に接続するので、構成を簡単にできる。
【００５０】
請求項２０の発明に係わる限流素子用超電導コイル装置は、請求項７ないし請求項１８のいずれかの発明において、無誘導コイル周囲に環状の二本の共通接続部材を配置し、共通接続部材に各ユニットコイルからの端子を電気的に接続することを特徴とする。
【００５１】
請求項２０の発明に係わる限流素子用超電導コイル装置では、請求項７ないし請求項１８のいずれかの発明の作用に加え、無誘導コイル周囲に環状の二本の共通接続部材を配置し、共通接続部材に各ユニットコイルからの端子を電気的に接続するので、構成を簡単にできる。
【００５２】
請求項２１の発明に係わる限流素子用超電導コイル装置は、請求項１７または請求項１８の発明において、前記共通接続部材を酸化物超電導体で構成したことを特徴とする。
【００５３】
請求項２１の発明に係わる限流素子用超電導コイル装置では、請求項１７または請求項１８の発明の作用に加え、共通接続部材を酸化物超電導体で構成したので、接続部で発生する損失を低減できる。
【００５４】
請求項２２の発明に係わる限流素子用超電導コイル装置は、請求項１７または請求項１８の発明において、前記複数のユニットコイルを各々独立のクライオ容器に納めることを特徴とする。
【００５５】
請求項２２の発明に係わる限流素子用超電導コイル装置では、請求項１７または請求項１８の発明の作用に加え、複数のユニットコイルを各々独立のクライオ容器に納めるので、構成を簡単にしメンテナンスを容易にできる。
【００５６】
請求項２３の発明に係わる限流素子用超電導コイル装置は、請求項７ないし請求項２２のいずれかの発明において、三相の複数のユニットコイルを同じ順でトロイド状に配置することを特徴とする。
【００５７】
請求項２３の発明に係わる限流素子用超電導コイル装置は、請求項７ないし請求項２２のいずれかの発明の作用に加え、三相の複数のユニットコイルを同じ順でトロイド状に配置するので、装置としてコンパクトにできる。
【００５８】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。図１は本発明の第１の実施の形態に係わる限流素子用超電導コイル装置におけるコイル構成の説明図である。
【００５９】
図１に示すようにコイル１はトロイド状に形成されている。図２は、図１のトロイド状コイルのコイル方向での断面図である。４本の超電導線材が設けられており、各々の超電導線は２枚の同じ長さの超電導線材である超電導テープ２ａ、２ｂを重ねて形成されている。そして、絶縁材３および補強材４を介してそれぞれの超電導線は結合されている。
【００６０】
図３は、超電導線テープ２の一例として、３ｍｍ幅、０．３ｍｍ厚のＡｇシースの（Ｂｉ，Ｐｂ）_２Ｓｒ_２Ｃａ_２Ｃｕ_３Ｏ_ｙ（Ｂｉ２２２３）酸化物超電導テープの臨界電流密度Ｊｃの磁界依存性を示した特性図である。Ｂｉ２２２３酸化物超電導テープでは、テープ面に垂直方向に磁界をかけた場合の臨界電流密度Ｊｃの劣化が著しい。そこで、この方向に磁界がかからないように超電導テープを配置すればさらに効果が望まれる。
【００６１】
すなわち、この第１の実施の形態では、図３の特性を持つＢｉ２２２３酸化物超電導テープ２ａ、２ｂを２枚重ねたものを超電導線材とし、図１のように、その超電導テープ面に垂直に磁界がかからないように配置している。これにより無誘導コイルを得るようにしている。
【００６２】
図２に示すように、４本の超電導線材は正の方向に電気を流す線材の長さと、負の方向に電気を流す線材の長さとが等しくなるように配置する。各線材に２００Ｍｐａ以上の引張り強度をもつ波状の補強材４を同時に巻き回して電磁力により線材が引張られ性能が劣化することに対し保護を行う。
【００６３】
補強材４には比誘電率が液体窒素の値に近いものを用いる。補強材４と線材との間には、絶縁紙、ＦＲＰ板、カプトンテープなどの絶縁材３を同時に巻き回して絶縁をとる。線材がホルムアール等の絶縁材３で被覆されている場合、または補強材４が絶縁材３で構成されているか被覆されている場合には、この絶縁材３は不要である。ここで、絶縁材３とは室温での体積抵抗率が１０^７Ω・ｍ以上のものをさす。
【００６４】
この第１の実施の形態により、限流素子用として６．６ｋＶ級の限流素子用超電導コイル装置を製作したところ、通常は負荷率８０％まで交流５０Ｈｚで安定に通電でき、損失は１２０Ｗと小さく、事故時には均一に抵抗転移した。また、素子は劣化することなく良好な限流器としての性能が得られた。
【００６５】
次に、本発明の第２の実施の形態を説明する。図４は本発明の第２の実施の形態に係わる限流素子用超電導コイル装置の説明図である。
【００６６】
図４に示すように、２種類のユニットコイル５ａ、５ｂを用意し、これらを交互に一定の間隔を保って等間隔に配置し、共通接続部材６ａ、６ｂで接続して構成される。２種類のユニットコイル５ａ、５ｂについては後述する。電流は電極７ａから入りユニットコイル５ａを通り、共通接続部材６ａを経由してユニットコイル５ｂを通り、共通接続部材６ｂを経由して隣のユニットコイル５ａを通るという経緯を繰り返し、電極７ｂから出ていく。
【００６７】
図５はユニットコイル５の説明図であり、図５（ａ）はユニットコイル５の特性概念の説明図、図５（ｂ）はユニットコイル５の巻き方の説明図、図５（ｃ）はユニットコイル５の超電導線材の説明図である。
【００６８】
図５（ａ）に示すように、ユニットコイル５は３つの構成コイル８ａ、８ｂ、８ｃからなるパンケーキコイルを積層して構成している。すなわち、複数の超電導線材が同心に螺旋状に巻かれ、各線材に通電される電流の向きが交互に逆向きになるように形成される。各構成コイル８ａ、８ｂ、８ｃを通過する磁束の和が零となるようにターン数および面積を決定する。これにより、無誘導コイルを形成するようにしている。
【００６９】
たとえば、３つのコイルが構成コイル８ａ、構成コイル８ｂ、構成コイル８ｃの順に配置され、構成コイル８ａ、８ｃは正方向に電流が流れ、構成コイル８ｂには逆向きの電流を流すとして、各構成コイル８ａ、８ｂ、８ｃの断面積をＳａ、Ｓｂ、Ｓｃ、ターン数をＮａ、Ｎｂ、Ｎｃとした場合、以下の式が成立するように、各断面積Ｓおよびターン数Ｎを決定する。
【００７０】
Ｎａ・Ｓａ＋Ｎｃ・Ｓｃ＝Ｎｂ・Ｓｂ
ここで、最小構成コイル８ａの内直径は、超電導線材の曲げひずみによるＩｃ劣化が曲げがない場合と比較して１０％以内に抑えられるような値以上の径に設定する。
【００７１】
図６にその一例として、超電導線材がＡｇ／Ｂｉ２２２３テープである場合のＩｃと曲げ歪みとの関係を示す。この図６によるとＡｇ／Ｂｉ２２２３テープを使用する場合、Ｉｃ劣化１０％以内を満たすには、曲げ歪みは０．２５％未満である必要がある。
【００７２】
次に、ユニットコイル５の具体的な巻き方について図５（ｂ）を参照して説明する。ユニットコイル５には２種類あり、一つは図５（ｂ）に示すように、構成コイル８ａとコイル８ｃが右巻きで、構成コイル８ｂが左巻である場合である。これら構成コイル８ａ、８ｂ、８ｃを、断面がコ字型接続部材９を用いて直列接続する。このようにして形成されたシングルパンケーキコイルがユニットコイル５ａである。
【００７３】
一方、もう一つは、構成コイル８ａと構成コイル８ｃが左巻きで、構成コイル８ｂが右巻である場合である。これら構成コイル８ａ、８ｂ、８ｃを、断面がコ字型接続部材９を用いて直列接続する。このようにして形成されたシングルパンケーキコイルがユニットコイル５ｂである。
【００７４】
そして、ユニットコイル５ａ、５ｂをそれぞれ６個ずつ用意し、共通接続部材６ａ、６ｂにより電気的に接続する。つまり、これら２種類のユニットコイル５ａ、５ｂを図４に示すように交互に配置し、ユニットコイル５ａとユニットコイル５ｂは共通接続部材６ａ、６ｂで順次電気的に接続し、一周させることで直列接続を得る。
【００７５】
また、構成コイル８ａ、８ｂ、８ｃを製作する際は、図５（ｃ）に示すように超電導テープ２と絶縁材３と波状の補強材４とを共に巻き回す。ここで、超電導線テープ２または波状の補強材４が絶縁物により被覆されている場合、または波状の補強材４が絶縁物で構成されている場合には絶縁材３は不要となる。このようにして、３つの構成コイル８ａ、８ｂ、８ｃからなるパンケーキコイルを積層してユニットコイルとしている。
【００７６】
この第２の実施の形態では、性能に異方性のあるＢｉ_２Ｓｒ_２Ｃａ_１Ｃｕ_２Ｏ_ｙ（Ｂｉ２２１２）のＡｇシーステープ（３．８ｍｍ幅、０．２５ｍｍ厚）を３枚重ねたものを超電導線材とし、より性能劣化するテープ面に垂直な磁界がかからないように線材を配置している。
【００７７】
また、共通接続部材６やコ字型接続部材９は銅または銅合金製のものを用いるが、さらに低損失が要求される場合は、臨界温度が７７Ｋ以上の超電導体のバルクを用い、線材との接続部材にＡｇメッキまたは半田メッキしてもよい。
【００７８】
この第２の実施の形態により、限流素子用として６．６ｋＶ級の限流素子用超電導コイル装置を製作したところ、通常は負荷率８５％まで交流５０Ｈｚで安定に通電でき、損失は１００Ｗと小さく、事故時には均一に抵抗転移した。また、素子は劣化することなく良好な限流器としての性能が得られた。
【００７９】
次に、本発明の第３の実施の形態を説明する。図７は本発明の第３の実施の形態に係わる限流素子用超電導コイル装置の説明図であり、図７（ａ）は斜視図、図７（ｂ）は平面図である。
【００８０】
図７では、説明を簡単にするため４個のユニットコイル５が設けられた場合を示している。各ユニットコイル５の電流の入の部分の共通接続部材６ｓを環状共通接続部材１０ｓに電気的に接続し、電流の出の部分の共通接続部材６ｅを環状共通接続部材１０ｅに電気的に接続する。これにより、ユニットコイル５は並列接続される。
【００８１】
また、電流は電極７ｓから入り環状共通接続部材１０ｓを通って各ユニットコイル５に共通接続部材６ｓから入り、共通接続部材６ｅおよび環状共通接続部材１０ｅを通って電極７ｅから出ていく。環状共通接続部材１０ｓ、１０ｅは「印加電圧／冷媒の耐圧」分だけ空間的に距離を離す。
【００８２】
共通接続部材６、環状共通接続部材１０、電極７は、銅か銅合金製で形成される。そして、線材と接続する部分では電気的接続長を１０ｃｍ以上とるが、さらに低損失が要求される場合は、臨界温度が７７Ｋ以上の超電導体のバルクを用い、線材または接続端子との接続する部分にはＡｇメッキ又は半田メッキしてもよい。
【００８３】
ユニットコイル５はシングルパンケーキコイルを多層（例えば１６層）重ねて直列接続して構成される。図８に、ユニットコイル５内のシングルパンケーキコイルの構成図を示す。図８（ａ）は、補強材４に超電導テープ２を搭載して形成された超電導線がバイファイラー巻きされたものを示しており、図８（ｂ）は図８（ａ）のＡ部の詳細図、図８（ｃ）は図８（ｂ）のａ方向から見た部分側面図である。
【００８４】
図８（ａ）に示すように、超電導テープ２と補強材４との位置が反転するように中心部で巻き回しを行う。このときの巻き径Ｄは、超電導テープ２のＩｃの劣化が曲げを加えない場合と比較し１０％以内に収まる曲げ歪以下に抑えるように決定する。このように接続する場合、最内層のコイル径はＩｃの劣化が曲げを加えない場合と比較し１０％以内におさまる曲げ歪以下に抑えられる径の二倍が必要となる。
【００８５】
また、図８（ｂ）に示すように、超電導線は、２枚の超電導テープ２ａ、２ｂと補強材４とで形成され、バイファイラー巻きされた２枚の超電導線間の距離Ｌは、「かかりうる電圧／冷媒の耐圧」で決まる距離以上に離す。また、超電導線の超電導テープ２は、図８（ｃ）に示すように、補強材４より幅の狭いものが用いられている。ここで、補強材４の表面には必要に応じて絶縁材３が設けられる。
【００８６】
図９に、超電導線の巻き方を示す。ここで形成される超電導線は、１０ｍｍ幅、０．１ｍｍ厚のＹＢａ_２Ｃｕ_３Ｏ_ｙ（Ｙ１２３）／ＹＳＺ／ハステロイ基板テープを２枚（２条）重ねたものを超電導線材とし、これら２枚を絶縁被覆した補強材と共に性能劣化の激しいテープ面に垂直な磁界がかからないようにバイフフイラー巻きする。このように、ユニットコイル５は超電導線材を２条以上でかつ偶数条にバイファイラー巻きしたパンケーキコイルを一段または複数段積層して形成される。
【００８７】
平面円板状の絶縁材であるＦＲＰ製板１１に、予めレコード状の溝１２を形成しておき、このＦＲＰ製板１１の中心部を固定具１３ａで回転自在に固定しておく。一方、超電導テープ２ａ、２ｂを巻き付けた２組の超電導テープ用リール１４ａ、１４ｂを用意し、その中心部を固定具１３ｂ、１３ｃで回転自在に固定すると共に、補強材４を巻き付けた２組の補強材用リール１５を固定具１３ｄで固定する。補強材用リール１５は、ホルムアールで絶縁被覆した非磁性体のＳＵＳ３１６製であり、補強材は、超電導線テープ２ａ、２ｂより幅の広いものとして形成されるので、その補強材用リール１５は、超電導線テープ２ａ、２ｂより幅の広いものが用意される。この補強材４はスペーサとしての役目もする。
【００８８】
そして、２組の各々の補強材の端部をＦＲＰ製板１１のレコード状溝１２に填め込み、補強材端部固定具１６でＦＲＰ製板１１に固定する。超電導テープ２ａ、２ｂは予め必要長の半分で引き出して各々の２個ずつの超電導テープ用リール１４ａ、１４ｂに巻かれており、引き出した部分を、ＳＵＳ３１６製の補強材４の中心上に載せて巻き始める。
【００８９】
レコード状溝にＳＵＳ３１６製の補強材４を填め込みながら、その上に超電導テープ２を乗せて巻き回していく。巻き線の終了後は超電導テープ２、補強材４ともに線の端部を巻き戻らぬよう固定し、平板からＦＲＰ製板１１ごと外し、その上にＦＲＰ製板１１と鏡像の関係にレコード状溝１２をきったＦＲＰ製板をかぶせてレコード状溝１２にＳＵＳ３１６製補強材２１の片端を填め込みパンケーキコイルを完成させる。
【００９０】
図１０に一層目と二層目との接続の様子を示す。図１０に示すように、一つめのシングルパンケーキコイルの外側の超電導テープ２ａと隣のシングルパンケーキコイルの内側の超電導テープ２ｂとを共通接続部材６ｂに電気的に接続することで直列接続する。このようにして、隣り合ったシングルパンケーキコイルを接続していく。
【００９１】
図１０の矢印は電流の流れる方向を示しており、電流は共通接続部材６ａから一つめのシングルパンケーキコイルの内側のテープ２ａ’から入り、超電導テープ２ａ、共通接続部材６ｂ、超電導テープ２ｂ、超電導テープ２ｂ’、共通接続部材６ａと出て行く。一つのユニットコイル５には２４０Ａ電流が流せる。そこで、例えば３ｋＡｒｍｓ通電するためには、８個のユニットコイル５を直径２ｍの円の周りに配置して並列接続しトロイダルコイルを構成することになる。
【００９２】
このように、ユニットコイル５は、隣り合う複数の同心のコイルに、交互に逆向きの電流が流れるように構成したパンケーキコイルを一段または複数段積層して構成される。また、一層おきに逆向きの電流を流してコイル中心に発生する磁界をゼロにするようにユニットコイル５を構成してもよい。
【００９３】
この第３の実施の形態により、限流素子用として６６ｋＶ級の限流素子用超電導コイル装置を製作したところ、通常は負荷率９０％まで交流５０Ｈｚで安定に通電でき、損失は１０ｗと小さく、事故時には均一に抵抗転移した。また、素子は劣化することなく良好な限流器としての性能が得られた。
【００９４】
次に、本発明の第４の実施の形態を説明する。図１１は本発明の第４の実施の形態に係わる限流素子用超電導コイル装置の説明図であり、図１１（ａ）は概略斜視図、図１１（ｂ）はその概略側面図、図１１（ｃ）はユニットコイル５の説明図、図１１（ｄ）は溝付き巻枠の説明図である。
【００９５】
図１１（ａ）に示すように、ユニットコイル５は上部で環状共通接続部材１０ｅに接続され、下部で環状共通接続部材１０ｓに接続されている。すなわち、図１１（ｂ）の概略側面図に示すように、各々のユニットコイル５の超電導テープの端部は、ユニットコイル５の上部において、電極７ｅを介し環状共通接続部材１０ｅに接続され、ユニットコイル５の下部において、電極７ｓを介し環状共通接続部材１０ｓに接続されている。
【００９６】
図１１（ｃ）に示すように、ユニットコイル５は各々独立してクライオ容器１７内に入れられ、ユニットコイル５は二層のソレノイドコイルをインダクタンスがほぼ０となるように接続して構成されている。すなわち、図１１（ｄ）に示す溝付き巻枠の内側に右巻きコイルの一層目１８ａが正方向で接続され、溝付き巻枠の外側に二層目１８ｂが負方向に電流を流すように接続されている。これにより、無誘導コイルを形成している。超電導テープ２は、図１１（ｄ）に示すように、溝付き巻枠の角型でスパイラルにきった溝１９に巻き込んでいる。
【００９７】
ここで、電極７ｅ、７ｓおよび環状共通接続部材１０ｅ、１０ｓは、ジュール損を低減するため臨界温度が７７．３Ｋ以上である酸化物超電導体にＡｇまたは半田をメッキしたものを用いてもよい。
【００９８】
また、使用した超電導テープ２は、図１２に示すように、１μｍの酸化物Ｙ_１Ｂａ_２Ｃｕ_３Ｏ_７‐δ２０が１μｍのＹＳＺ板２１を介して幅１０ｍｍ、０．１ｍｍ厚の網目状基板のハステロイ板２２の上に蒸着された網目形状をしている。また、ソレノイドコイルはコイルのシータ方向の熱膨張係数が１．６×１０^‐６［１／Ｋ］であるダイニーマＦＲＰを用いた。
【００９９】
第４の実施の形態により、限流素子用として６６ｋＶ級の限流素子用超電導コイル装置を製作したところ、通常は負荷率９５％まで交流５０Ｈｚで安定に通電でき、損失は３０Ｗと小さく、事故時には均一に抵抗転移した。また、素子は劣化することなく良好な限流器としての性能が得られた。
【０１００】
次に、本発明の第５の実施の形態を説明する。図１３は本発明の第５の実施の形態に係わる限流素子用超電導コイル装置の説明図であり、図１３（ａ）は概略斜視図、図１３（ｂ）は磁界印加コイルの説明図である。
【０１０１】
ここで、限流素子用超電導コイル装置のユニットコイル５は、第３の実施の形態に説明したものと同じものであるが、ここでは、製作方法としてパンケーキコイルは事前に巻いたものをＦＲＰ製板のレコード状溝に入れる方法で製作したものを用いている。
【０１０２】
このユニットコイル５を、図１３（ａ）に示すように交流三相のＵ相、Ｖ相、Ｗ相交互に配置し、図１３（ｂ）に示すように各相ごとに環状共通接続部材１０ｕ、１０ｖ、１０ｗを介して接続する。そして、この三相全部が一つのトロイダルコイルとなっている無誘導の限流素子用超電導コイル装置に、図１３（ｂ）に示す向きに磁界がかかるように、磁界印加コイル２３を配置する。
【０１０３】
ここでかける磁界は、超電導テープのＩｃが磁界をかけないときと比較し５０％以下になるように設定すればよい。たとえば、Ｂｉ２２２３超電導テープを使用した場合には、図３よりＢ：０．３Ｔ以上が必要となる。限流素子用超電導コイル装置の部分での空間の磁界の均一度は５％以内が望ましい。
【０１０４】
この第５の実施の形態により限流素子用として６６ｋＶ級の限流素子用超電導コイル装置を製作したところ、通常は負荷率９１％まで交流５０Ｈｚで安定に通電でき、損失は１０Ｗと小さく、事故時には均一にすばやく抵抗転移した。また、素子は劣化することなく良好な限流器としての性能が得られた。
【０１０５】
次に、本発明の第６の実施の形態を説明する。第６の実施の形態では、第２の実施の形態で用いる超電導テープ２として、図１４に示すような超電導テープを用いるようにしたものである。すなわち、第２の実施の形態と同じように、３個の逆向きの構成コイルでできたパンケーキコイルを用い、使用する超電導テープ２として図１４に示すものを用いる。
【０１０６】
図１４に示すように、１μｍの酸化物Ｙ_１Ｂａ_２Ｃｕ_３Ｏ_７‐δ２０が１μｍのＹＳＺ板２１を介して幅１０ｍｍ、０．１ｍｍ厚で裏側に０．２ｍｍの突起のあるハステロイ板２２の上に蒸着された形状をしている。この裏面に凹凸のある超電導テープ２と絶縁板と補強材とを第２の実施の形態のように巻き回す。波状補強材は使用しない。
【０１０７】
この第６の実施の形態により、限流素子用として６６ｋＶ級の限流素子用超電導コイル装置を製作したところ、通常は負荷率９１％まで交流５０Ｈｚで安定に通電でき、損失は１０Ｗと小さく、事故時には均一にすばやく抵抗転移した。また、素子は劣化することなく良好な限流器としての性能が得られた。
【０１０８】
次に、本発明の第７の実施の形態を説明する。図１５は本発明の第７の実施の形態の説明図であり、図１５（ａ）は円筒形絶縁物を間隔をおいて接着した絶縁物製線の説明図、図１５（ｂ）は図１５（ａ）の絶縁物と超電導テープとを巻いたバイファイラー巻きコイルの説明図である。
【０１０９】
ユニットコイル５は第３の実施の形態と同じように、バイファイラー巻きをしたパンケーキコイルとする。図１５（ａ）に示すように、絶縁板として、例えば釣り糸のような絶縁物製の１ｍｍ径の絶縁物製線２４に１ｃｍごとに厚み１ｍｍ、１ｃｍ径のＧＦＲＰのような絶縁物製円筒２５を機械的に接着したものを使用する。絶縁物製線２４はポリエチレンでもよい。また絶縁物製円筒２５は球でもよいし、素材は窒化アルミでもよい。
【０１１０】
この絶縁板と超電導テープと補強材とを、図１５（ｂ）に示すように第３の実施の形態のように巻き回す。波状補強材は使用しない。
【０１１１】
この第７の実施の形態により限流素子用として６６ｋＶ級の限流素子用超電導コイル装置を製作したところ、通常は負荷率９６％まで交流６０Ｈｚで安定に通電でき、損失は９Ｗと小さく、事故時には均一にすばやく抵抗転移した。また、素子は劣化することなく良好な限流器としての性能が得られた。
【０１１２】
ここで、隣り合う超電導線材間に冷却手段を設けることも可能である。これにより、発熱を冷却できると共に、絶縁距離を考慮して冷却溝の幅を決定すれば絶縁もかねられる。
【０１１３】
【発明の効果】
以上述べたように、本発明によればトロイド状に無誘導の超電導コイルを構成するので、安定で交流損失が小さく，均一に常電導転移する限流素子用超電導コイル装置を得ることができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態に係わる限流素子用超電導コイル装置のコイル構成の説明図。
【図２】本発明の第１の実施の形態におけるコイルの断面図。
【図３】本発明の第１の実施の形態における超電導テープの臨界電流密度の磁界依存性を示した特性図。
【図４】本発明の第２の実施の形態に係わる限流素子用超電導コイル装置のコイル構成の説明図。
【図５】本発明の第２の実施の形態におけるユニットコイルの説明図であり、図５（ａ）はユニットコイルの特性概念の説明図、図５（ｂ）はユニットコイルの巻き方の説明図、図５（ｃ）はユニットコイルの超電導線材の説明図。
【図６】本発明の第２の実施の形態におけるユニットコイルの最小構成コイルの内径を求める場合のＡｇ／Ｂｉ２２２３テープのＩｃと曲げ歪みとの関係を示す特性図。
【図７】本発明の第３の実施の形態に係わる限流素子用超電導コイル装置の説明図であり、図７（ａ）は斜視図、図７（ｂ）は平面図。
【図８】本発明の第３の実施の形態におけるユニットコイルの説明図。
【図９】本発明の第３の実施の形態におけるユニットコイルの巻き方の説明図。
【図１０】本発明の第３の実施の形態におけるユニットコイルの間の巻き方の説明図。
【図１１】本発明の第４の実施の形態に係わる限流素子用超電導コイル装置の説明図であり、図１１（ａ）は概略斜視図、図１１（ｂ）はその概略側面図、図１１（ｃ）はユニットコイル５の説明図、図１１（ｄ）は溝付き巻枠の説明図。
【図１２】本発明の第４の実施の形態における超電導テープの説明図。
【図１３】本発明の第５の実施の形態に係わる限流素子用超電導コイル装置の説明図であり、図１３（ａ）は概略斜視図、図１３（ｂ）は磁界印加コイルの説明図。
【図１４】本発明の第６の実施の形態における超電導テープの説明図。
【図１５】本発明の第７の実施の形態の説明図であり、図１５（ａ）は円筒形絶縁物を間隔をおいて接着した絶縁物製線の説明図、図１５（ｂ）は図１５（ａ）の絶縁物と超電導テープとを巻いたバイファイラー巻きコイルの説明図。
【符号の説明】
１コイル
２超電導テープ
３絶縁物
４補強材
５ユニットコイル
６共通接続部材
７電極
８構成コイル
９コ字型接続部材
１０環状共通接続部材
１１ＦＲＰ製板
１２レコード状溝
１３固定具
１４超電導テープ用リール
１５補強材用リール
１６補強材端部固定具
１７クライオ容器
２４絶縁物製線
２５絶縁物製円筒[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a superconducting coil device for a current limiting element that can be used in a current limiting device that suppresses overcurrent in an AC circuit.
[0002]
[Prior art]
For example, a current limiting device using a superconducting coil device disclosed in Japanese Patent Application Laid-Open No. Hei 2-202320 has a superconducting current limiting coil having an inductance that suppresses current below a limit and has a critical current value equal to or higher than the limit value, and its limit A superconducting trigger coil in which a first superconducting coil and a second superconducting coil connected in parallel with a critical current value smaller than the normal current and larger than the normal current are wound in a non-inductive manner, and the superconducting trigger coil It is composed of a return switch connected in series. These coils have a solenoid configuration and are installed in a cryocontainer and immersed in a refrigerant for operation.
[0003]
Next, the operation will be described. Normally, the current flows through a superconducting trigger coil having a critical current value larger than a normal current and wound non-inductively with zero resistance without a voltage drop. When the circuit current becomes excessive due to an accident, the superconducting trigger coil is quenched and the resistance value increases. At this time, if the resistance value of the superconducting trigger coil is set to be larger than the impedance of the superconducting current limiting coil, the current flowing in the superconducting trigger coil is commutated to the superconducting current limiting coil, and the short circuit current is superconducting current limiting. The current is limited to a value determined by the coil impedance.
[0004]
[Problems to be solved by the invention]
However, in the above-described solenoid coil configuration, a vertical magnetic field is applied to the wire at the end of the coil, so that there is a problem in that the coil deteriorates without uniformly conducting a normal conduction transition. In particular, in the case of using a wire such as an oxide superconducting tape conductor having anisotropy in which performance deterioration is significant with respect to a vertical magnetic field, there is a problem in that a large AC loss occurs due to inability to energize stably.
[0005]
Accordingly, an object of the present invention is to provide a superconducting coil device for a current-limiting element that can be stably energized and has a small AC loss and a uniform normal conduction by configuring a non-inductive superconducting coil that hardly generates a vertical magnetic field at the end. Is to get.
[0008]
[Means for Solving the Problems]
  Claim1The superconducting coil device for current limiting element according to the invention ofA non-inductive coil wound with a superconducting wire is housed in a cryocontainer, and a toroidal region formed by moving a small circle having a radius smaller than the great circle along the circumference of the great circle, A first superconducting wire wound around the circumference of the great circle and a second superconducting wire wound along the first superconducting wire while proceeding in a circumferential direction.It is characterized by that.
[0009]
  In the superconducting coil device for the current limiting element according to the first aspect of the present invention, the superconducting wire is arranged in a toroid shape to form a non-inductive coil. Reduction and uniform normal conduction transitionThe
[0012]
  The superconducting coil device for a current limiting element according to the invention of claim 2 is the invention of claim 1, whereinFirst and secondSuperconducting wireIs the sameIt is characterized by the fact that it is the same length.
[0013]
  In the superconducting coil device for a current limiting element according to the invention of claim 2, in addition to the action of the invention of claim 1,First and secondSuperconducting wireAre the same lengthTherefore, the normal impedance can be reduced and the drift can be prevented.
[0014]
  Claim7The superconducting coil device for current limiting element according to the invention ofA non-inductive coil wound with a superconducting wire is housed in a cryocontainer, and a toroidal region formed by moving a small circle having a radius smaller than the great circle along the circumference of the great circle, Having a plurality of unit coils wound with superconducting wire around an axis along the circumferenceIt is characterized by that.
[0015]
  Claim7In the superconducting coil device for current limiting element according to the invention ofBy arranging the superconducting wire in a toroidal shape to form a non-inductive coil, the coil magnetic field can be reduced uniformly and stably energized, AC loss can be reduced and the normal conducting transition can be made uniform.In addition, by arranging a plurality of identical unit coils at equal intervals, the winding can be easily configured and unitized, so that only the deteriorated part can be easily replaced when the deterioration occurs.
[0018]
  Claim3 and claim 8A superconducting coil device for a current limiting element according to the invention of claim 1 is provided.Or claim 2 or claim 7In the invention ofIn a direction perpendicular to the great circleA magnetic field application coil for applying a magnetic field is provided.
[0019]
  Claim3 and claim 8In the superconducting coil device for current limiting element according to the invention of claim 1,Or claim 2 or claim 7In addition to the action of the invention, by applying a magnetic field forcibly after the occurrence of resistance, resistance transition is promoted and deterioration of the wire is prevented.
[0020]
  Claim9A superconducting coil device for a current limiting element according to the invention of claim7 or claim 8According to the invention, the unit coil is composed of two or more even-numbered solenoid coils configured to flow a reverse current every other layer so that the magnetic field generated at the coil center is zero. It is characterized by.
[0021]
  Claim9In the superconducting coil device for current limiting element according to the invention of claim 1,7 or claim 8In addition to the action of the invention of the present invention, current flows in the opposite direction every two or more layers of solenoid coils to zero the magnetic field generated at the center of the coil, so that it is easy to wind and the insulation configuration can be easily obtained, and the normal impedance is further increased. Can be reduced.
[0022]
  Claim10A superconducting coil device for a current limiting element according to the invention of claim7 or claim 8In the invention, the unit coil is formed by stacking one or a plurality of pancake coils configured such that a reverse current flows alternately through a plurality of adjacent concentric coils.
[0023]
  Claim10A superconducting coil device for a current limiting element according to the invention of claim7 or claim 8In addition to the operation of the present invention, the configuration is such that a reverse current flows alternately to a plurality of adjacent concentric coils of unit coils formed by laminating one or more pancake coils. .
[0024]
  Claim11A superconducting coil device for a current limiting element according to the invention of claimAny one of claims 7 to 10In the invention, the number of concentric coils is three or more.
[0025]
  Claim 11In the superconducting coil device for current limiting element according to the invention of claim 1,Any one of claims 7 to 10In addition to the operation of the present invention, since there are three or more concentric coils, the impedance can be further reduced.
[0026]
  Claim 12A superconducting coil device for a current limiting element according to the invention of claimAny one of claims 7 to 11In the invention, the unit coil is formed by laminating one or more stages of pancake coils in which two or more superconducting wires are wound and bifilar wound in an even number.
[0027]
  Claim 12In the superconducting coil device for current limiting element according to the invention of claim 1,Any one of claims 7 to 11In addition to the action of the invention, a unit coil is formed by laminating one or more superconducting wire pancake coils, which are bifilar wound into even-numbered ones, so that a twisting force can be applied to the wire. And normal impedance can be greatly reduced.
[0030]
  According to a thirteenth aspect of the present invention, there is provided a superconducting coil device for a current limiting element.9In the invention, the solenoid coil is formed of an insulator winding frame having a thermal expansion coefficient lower than that of the superconducting wire, and the rectangular groove having a width equal to or larger than the width of the superconducting wire is formed in the winding frame.Is carvedIt is characterized in that a superconducting wire is wound along the groove.
[0031]
  In the superconducting coil device for a current limiting element according to the invention of claim 13,9In addition to the operation of the invention, the movement of the superconducting wires can be suppressed, and the wire can be protected from performance deterioration due to dielectric breakdown due to contact between the superconducting wires.
[0032]
  Claim4 and claimsThe superconducting coil device for a current limiting element according to the invention of No. 14A non-inductive coil wound with a superconducting wire is housed in a cryocontainer, and the superconducting wire is arranged in a toroid shape.In the invention, the superconducting wire and the reinforcing material are wound at the same time.
[0033]
  Claim4 and claim 14In the superconducting coil device for current limiting element according to the invention ofBy arranging the superconducting wire in a toroidal shape to form a non-inductive coil, the coil magnetic field can be reduced uniformly and stably energized, AC loss can be reduced and normal conduction transition can be achieved uniformly.In addition, since the superconducting wire and the reinforcing material are wound at the same time, the wire can be protected from performance deterioration due to electromagnetic force.
[0034]
  Claim5 and claimsA superconducting coil device for a current limiting element according to the invention of claim 15Any one of claims 1 to 3Or claimsAny one of claims 7 to 14In the invention, the superconducting wire and the insulating material are wound at the same time.
[0035]
  Claim5 and claimsIn the superconducting coil device for current limiting element according to the invention of 15,By arranging the superconducting wire in a toroid shape to form a non-inductive coil, the magnetic field of the coil can be uniformly reduced and stably energized, alternating current loss can be reduced and normal conduction transition can be performed uniformly, andClaim 1Or any one of claims 3OrClaim 7 toClaim 14EitherIn addition to the function of the invention, the wire can be protected from performance deterioration due to dielectric breakdown, and the reinforcing material is wound at the same time, so that the wire can be protected from performance deterioration due to dielectric breakdown.
[0038]
  Claim6 and claim 16A superconducting coil device for a current limiting element according to the invention of claim4Alternatively, in the invention of claim 14, the reinforcing material is constituted by a wave-processed tape.
[0039]
  Claim6 and claim 16In the superconducting coil device for current limiting element according to the invention of claim 1,4Alternatively, in addition to the effect of the invention of the fourteenth aspect, since the reinforcing material is a wave-processed tape, electromagnetic force retention, cooling effect, and insulation measures can be obtained at a time.
[0044]
  Claim17The superconducting coil device for current limiting element according to the invention ofAny one of claims 7 to 16In the invention, the unit coil is formed by forming a groove-like groove of a record on a plate made of an insulating material, and placing a superconducting wire in the groove.
[0045]
  Claim17In the superconducting coil device for current limiting element according to the invention ofAny one of claims 7 to 16In addition to the operation of the present invention, the unit coil is constructed by inserting a superconducting wire in a disk-shaped groove of a disc made of an insulating material, so that electromagnetic force retention, cooling effect, and insulating effect can be obtained at a time.
[0046]
  Claim18The superconducting coil device for current limiting element according to the invention ofAny one of claims 7 to 16In the invention, the unit coil forms a groove-like groove of a record on a plate made of an insulator, and a spacer made of an insulator wider than the superconducting wire is put in the groove, and the superconducting wire is placed on the spacer. It is characterized by winding.
[0047]
  Claim18The superconducting coil device for current limiting element according to the invention ofAny one of claims 7 to 16In addition to the action of the invention, an insulating spacer wider than the superconducting wire is placed in a disk-shaped groove of a disk made of an insulating material, and the superconducting wire is placed on the spacer and wound. Electromagnetic force retention, cooling effect, and insulating effect can be obtained without deteriorating.
[0048]
  Claim19The superconducting coil device for current limiting element according to the invention ofAny one of claims 7 to 18The invention is characterized in that a common connection member is disposed around the unit coil, and terminals from each pancake coil are electrically connected to the common connection member.
[0049]
  Claim19In the superconducting coil device for current limiting element according to the invention ofAny one of claims 7 to 18In addition to the operation of the present invention, the common connection member is disposed around the unit coil, and the terminals from each pancake coil are electrically connected to the common connection member.
[0050]
  Claim 20The superconducting coil device for current limiting element according to the invention ofAny one of claims 7 to 18The invention is characterized in that two annular common connection members are arranged around the non-inductive coil, and terminals from each unit coil are electrically connected to the common connection member.
[0051]
  Claim 20In the superconducting coil device for current limiting element according to the invention ofAny one of claims 7 to 18In addition to the operation of the present invention, two annular common connection members are arranged around the non-inductive coil, and terminals from each unit coil are electrically connected to the common connection member, so that the configuration can be simplified.
[0052]
  Claim 21A superconducting coil device for a current limiting element according to the invention of claim17Or claims18In the invention, the common connection member is made of an oxide superconductor.
[0053]
  Claim 21In the superconducting coil device for current limiting element according to the invention of claim 1,17Or claims18In addition to the operation of the invention, since the common connection member is made of an oxide superconductor, loss generated at the connection portion can be reduced.
[0054]
  Claim 22The superconducting coil device for current limiting element according to the invention ofClaim 17 or Claim 18In the present invention, each of the plurality of unit coils is housed in an independent cryocontainer.
[0055]
  Claim 22In the superconducting coil device for current limiting element according to the invention ofClaim 17 or Claim 18In addition to the operation of the present invention, the plurality of unit coils are housed in independent cryocontainers, so that the configuration can be simplified and maintenance can be facilitated.
[0056]
  Claim 23The superconducting coil device for current limiting element according to the invention of23. Any one of claims 7 to 22.The invention is characterized in that a plurality of three-phase unit coils are arranged in a toroidal shape in the same order.
[0057]
  Claim 23The superconducting coil device for current limiting element according to the invention of23. Any one of claims 7 to 22.In addition to the operation of the present invention, a plurality of three-phase unit coils are arranged in a toroid shape in the same order, so that the apparatus can be made compact.
[0058]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of a coil configuration in a superconducting coil device for a current limiting element according to the first embodiment of the present invention.
[0059]
As shown in FIG. 1, the coil 1 is formed in a toroidal shape. FIG. 2 is a cross-sectional view of the toroidal coil of FIG. 1 in the coil direction. Four superconducting wires are provided, and each superconducting wire is formed by superposing two superconducting tapes 2a and 2b having the same length. Then, the respective superconducting wires are coupled via the insulating material 3 and the reinforcing material 4.
[0060]
FIG. 3 shows an example of a superconducting wire tape 2 having an Ag sheath of 3 mm width and 0.3 mm thickness (Bi, Pb).₂Sr₂Ca₂Cu₃O_y(Bi2223) It is the characteristic view which showed the magnetic field dependence of the critical current density Jc of an oxide superconducting tape. In the Bi2223 oxide superconducting tape, the critical current density Jc is significantly deteriorated when a magnetic field is applied in a direction perpendicular to the tape surface. Therefore, if a superconducting tape is arranged so that no magnetic field is applied in this direction, a further effect is desired.
[0061]
That is, in the first embodiment, a superconducting wire is obtained by superposing two Bi2223 oxide superconducting tapes 2a and 2b having the characteristics shown in FIG. 3, and a magnetic field perpendicular to the surface of the superconducting tape as shown in FIG. It is arranged so that it will not be damaged. As a result, a non-inductive coil is obtained.
[0062]
As shown in FIG. 2, the four superconducting wires are arranged so that the length of the wire that flows electricity in the positive direction is equal to the length of the wire that flows electricity in the negative direction. The wire-like reinforcing material 4 having a tensile strength of 200 Mpa or more is wound around each wire material at the same time to protect the wire material from being pulled by an electromagnetic force and deteriorated in performance.
[0063]
The reinforcing material 4 has a relative dielectric constant close to that of liquid nitrogen. Between the reinforcing material 4 and the wire material, an insulating material 3 such as insulating paper, FRP plate, Kapton tape or the like is wound around at the same time for insulation. When the wire is covered with an insulating material 3 such as formal or when the reinforcing material 4 is formed of or covered with the insulating material 3, the insulating material 3 is not necessary. Here, the insulating material 3 has a volume resistivity of 10 at room temperature.⁷A thing of Ω · m or more.
[0064]
According to the first embodiment, a 6.6 kV class superconducting coil device for a current limiting element is manufactured for a current limiting element. Normally, a current can be stably supplied at an AC 50 Hz up to a load factor of 80%, and the loss is 120 W. Small and uniform resistance transfer at the time of the accident. In addition, the device had good performance as a current limiting device without deterioration.
[0065]
Next, a second embodiment of the present invention will be described. FIG. 4 is an explanatory diagram of a superconducting coil device for a current limiting element according to the second embodiment of the present invention.
[0066]
As shown in FIG. 4, two types of unit coils 5a and 5b are prepared, arranged alternately at regular intervals and at equal intervals, and connected by common connection members 6a and 6b. The two types of unit coils 5a and 5b will be described later. The electric current enters from the electrode 7a, passes through the unit coil 5a, passes through the common connection member 6a, passes through the unit coil 5b, passes through the common connection member 6b, and passes through the adjacent unit coil 5a. To go.
[0067]
FIG. 5 is an explanatory diagram of the unit coil 5, FIG. 5A is an explanatory diagram of a characteristic concept of the unit coil 5, FIG. 5B is an explanatory diagram of how to wind the unit coil 5, and FIG. It is explanatory drawing of the superconducting wire of the unit coil.
[0068]
As shown in FIG. 5 (a), the unit coil 5 is formed by stacking pancake coils composed of three constituent coils 8a, 8b, and 8c. That is, a plurality of superconducting wires are concentrically wound in a spiral shape, and are formed so that the directions of currents flowing through the wires are alternately reversed. The number of turns and the area are determined so that the sum of the magnetic fluxes passing through the constituent coils 8a, 8b, 8c becomes zero. Thereby, a non-inductive coil is formed.
[0069]
For example, it is assumed that three coils are arranged in the order of the constituent coil 8a, the constituent coil 8b, and the constituent coil 8c, and that the constituent coils 8a and 8c flow in the forward direction and the constituent coil 8b passes a reverse current. When the sectional areas of the coils 8a, 8b, and 8c are Sa, Sb, and Sc, and the number of turns is Na, Nb, and Nc, each sectional area S and the number of turns N are determined so that the following equations are satisfied.
[0070]
Na.Sa + Nc.Sc = Nb.Sb
Here, the inner diameter of the minimum configuration coil 8a is set to a diameter equal to or larger than a value that can suppress the Ic deterioration due to the bending strain of the superconducting wire to within 10% as compared with the case where there is no bending.
[0071]
As an example, FIG. 6 shows the relationship between Ic and bending strain when the superconducting wire is Ag / Bi2223 tape. According to FIG. 6, when using the Ag / Bi2223 tape, the bending strain needs to be less than 0.25% in order to satisfy Ic degradation within 10%.
[0072]
Next, a specific method of winding the unit coil 5 will be described with reference to FIG. There are two types of unit coils 5, one being a case where the constituent coil 8a and the coil 8c are right-handed and the constituent coil 8b is left-handed as shown in FIG. 5 (b). These constituent coils 8a, 8b and 8c are connected in series using a U-shaped connecting member 9 in cross section. The single pancake coil formed in this way is the unit coil 5a.
[0073]
On the other hand, the other is a case where the constituent coil 8a and the constituent coil 8c are left-handed and the constituent coil 8b is right-handed. These constituent coils 8a, 8b and 8c are connected in series using a U-shaped connecting member 9 in cross section. The single pancake coil formed in this way is the unit coil 5b.
[0074]
Then, six unit coils 5a and 5b are respectively prepared and electrically connected by the common connection members 6a and 6b. That is, these two types of unit coils 5a and 5b are alternately arranged as shown in FIG. 4, and the unit coils 5a and 5b are sequentially electrically connected by the common connection members 6a and 6b, and are connected in series by making a round. Get a connection.
[0075]
Further, when the constituent coils 8a, 8b, and 8c are manufactured, the superconducting tape 2, the insulating material 3, and the corrugated reinforcing material 4 are wound together as shown in FIG. Here, when the superconducting wire tape 2 or the corrugated reinforcing material 4 is covered with an insulator, or when the corrugated reinforcing material 4 is formed of an insulator, the insulating material 3 is not necessary. Thus, the pancake coil which consists of three component coils 8a, 8b, 8c is laminated | stacked, and it is set as the unit coil.
[0076]
In the second embodiment, Bi having anisotropy in performance₂Sr₂Ca₁Cu₂O_yThree sheets of (Bi2212) Ag sheathed tape (3.8 mm wide, 0.25 mm thick) are superconducting wires, and the wires are arranged so that a magnetic field perpendicular to the tape surface where the performance deteriorates is not applied.
[0077]
The common connection member 6 and the U-shaped connection member 9 are made of copper or a copper alloy. However, when further low loss is required, a bulk of a superconductor having a critical temperature of 77 K or more is used, The connecting member may be Ag-plated or solder-plated.
[0078]
According to the second embodiment, a 6.6 kV class superconducting coil device for a current limiting element is manufactured for a current limiting element. Normally, a current can be stably supplied at an AC 50 Hz up to a load factor of 85%, and the loss is 100 W. Small and uniform resistance transfer at the time of the accident. In addition, the device had good performance as a current limiting device without deterioration.
[0079]
Next, a third embodiment of the present invention will be described. FIG. 7 is an explanatory view of a superconducting coil device for a current limiting element according to a third embodiment of the present invention, FIG. 7 (a) is a perspective view, and FIG. 7 (b) is a plan view.
[0080]
FIG. 7 shows a case where four unit coils 5 are provided for ease of explanation. The common connection member 6s at the current input portion of each unit coil 5 is electrically connected to the annular common connection member 10s, and the common connection member 6e at the current output portion is electrically connected to the annular common connection member 10e. . Thereby, the unit coils 5 are connected in parallel.
[0081]
The current enters from the electrode 7s, passes through the annular common connection member 10s, enters each unit coil 5 from the common connection member 6s, and exits the electrode 7e through the common connection member 6e and the annular common connection member 10e. The annular common connecting members 10s and 10e are spatially separated by “applied voltage / refrigerant pressure”.
[0082]
The common connection member 6, the annular common connection member 10, and the electrode 7 are made of copper or a copper alloy. And in the part connected with the wire, the electrical connection length is 10 cm or more, but when further low loss is required, the part connected with the wire or the connection terminal using the bulk of the superconductor having a critical temperature of 77K or more. May be Ag-plated or solder-plated.
[0083]
The unit coil 5 is configured by stacking single pancake coils in multiple layers (for example, 16 layers) and connecting them in series. In FIG. 8, the block diagram of the single pancake coil in the unit coil 5 is shown. FIG. 8A shows a superconductor wire formed by mounting the superconducting tape 2 on the reinforcing material 4 and is wound by a bifilar, and FIG. 8B shows a portion A of FIG. 8A. FIG. 8 (c) is a detailed side view seen from the direction a in FIG. 8 (b).
[0084]
As shown in FIG. 8A, winding is performed at the center so that the positions of the superconducting tape 2 and the reinforcing material 4 are reversed. The winding diameter D at this time is determined so as to suppress the deterioration of Ic of the superconducting tape 2 to be equal to or less than the bending strain within 10% as compared with the case where bending is not applied. When connecting in this way, the coil diameter of the innermost layer needs to be twice the diameter that can be suppressed to be equal to or less than the bending strain within which the deterioration of Ic is within 10% of the case where bending is not applied.
[0085]
Further, as shown in FIG. 8B, the superconducting wire is formed by two superconducting tapes 2a and 2b and the reinforcing material 4, and the distance L between the two superconducting wires wound by bifilar is “ The distance is more than the distance determined by the “applicable voltage / refrigerant pressure”. Further, as shown in FIG. 8C, the superconducting tape 2 of the superconducting wire is narrower than the reinforcing material 4. Here, an insulating material 3 is provided on the surface of the reinforcing material 4 as necessary.
[0086]
FIG. 9 shows how the superconducting wire is wound. The superconducting wire formed here is 10 mm wide and 0.1 mm thick YBa.₂Cu₃O_y(Y123) / YSZ / Hastelloy substrate tape is used as a superconducting wire with two layers (two strips), and a bifilar winding is applied so that a magnetic field perpendicular to the tape surface where the performance is severely deteriorated is not applied together with a reinforcing material with these two insulation coatings. To do. In this way, the unit coil 5 is formed by laminating one or more stages of pancake coils in which two or more superconducting wires are wound and bifilar wound in an even number.
[0087]
A record-like groove 12 is formed in advance on an FRP plate 11 which is a flat disk-shaped insulating material, and the center portion of the FRP plate 11 is rotatably fixed by a fixture 13a. On the other hand, two sets of superconducting tape reels 14a and 14b wound with superconducting tapes 2a and 2b are prepared, and the central portions thereof are rotatably fixed by fixtures 13b and 13c, and two sets of reinforcing material 4 are wound. The reinforcing material reel 15 is fixed by a fixing tool 13d. The reinforcing material reel 15 is made of SUS316, which is a non-magnetic material that is insulation-coated with Form R. Since the reinforcing material is formed wider than the superconducting wire tapes 2a and 2b, the reinforcing material reel 15 is A tape having a width wider than that of the superconducting wire tapes 2a and 2b is prepared. This reinforcing material 4 also serves as a spacer.
[0088]
Then, the ends of each of the two sets of reinforcing members are fitted into the record-like grooves 12 of the FRP plate 11 and fixed to the FRP plate 11 with the reinforcing member end fixture 16. The superconducting tapes 2a and 2b are drawn out in half of the required length in advance and wound around each of the two superconducting tape reels 14a and 14b, and the drawn portions are placed on the center of the reinforcing material 4 made of SUS316. Start winding.
[0089]
While inserting the reinforcing material 4 made of SUS316 into the record-like groove, the superconducting tape 2 is placed on the groove and wound. After the winding is completed, both the superconducting tape 2 and the reinforcing material 4 are fixed so that the ends of the wires are not rewound, the FRP plate 11 is removed from the flat plate, and a record-like groove is formed on the relationship between the FRP plate 11 and the mirror image. 12 is covered with the FRP plate, and the record-like groove 12 is fitted with one end of the reinforcing material 21 made of SUS316 to complete the pancake coil.
[0090]
FIG. 10 shows the connection between the first layer and the second layer. As shown in FIG. 10, the superconducting tape 2a on the outer side of the first single pancake coil and the superconducting tape 2b on the inner side of the adjacent single pancake coil are connected in series by being electrically connected to the common connecting member 6b. . In this way, adjacent single pancake coils are connected.
[0091]
The arrows in FIG. 10 indicate the direction of current flow. The current enters from the tape 2a ′ inside the first single pancake coil from the common connection member 6a, and the superconducting tape 2a, the common connection member 6b, the superconducting tape 2b, It goes out with the superconducting tape 2b 'and the common connection member 6a. One unit coil 5 can carry a 240 A current. Thus, for example, in order to energize 3 kArms, eight unit coils 5 are arranged around a circle having a diameter of 2 m and connected in parallel to form a toroidal coil.
[0092]
As described above, the unit coil 5 is configured by laminating one or more stages of pancake coils configured such that a reverse current flows alternately in a plurality of adjacent concentric coils. Further, the unit coil 5 may be configured so that a magnetic field generated at the center of the coil is zeroed by passing a reverse current every other layer.
[0093]
According to the third embodiment, when a 66 kV class superconducting coil device for a current limiting element is manufactured for a current limiting element, normally, it can be stably energized at an AC 50 Hz up to a load factor of 90%, and the loss is as small as 10 w. At the time of the accident, the resistance was evenly transferred. In addition, the device had good performance as a current limiting device without deterioration.
[0094]
Next, a fourth embodiment of the present invention will be described. FIG. 11 is an explanatory view of a superconducting coil device for a current limiting element according to a fourth embodiment of the present invention, FIG. 11 (a) is a schematic perspective view, FIG. 11 (b) is a schematic side view thereof, FIG. (C) is explanatory drawing of the unit coil 5, FIG.11 (d) is explanatory drawing of a grooved winding frame.
[0095]
As shown in FIG. 11A, the unit coil 5 is connected to the annular common connection member 10e at the upper part and is connected to the annular common connection member 10s at the lower part. That is, as shown in the schematic side view of FIG. 11 (b), the end portion of the superconducting tape of each unit coil 5 is connected to the annular common connection member 10e via the electrode 7e at the upper part of the unit coil 5. The lower part of the coil 5 is connected to the annular common connecting member 10s via the electrode 7s.
[0096]
As shown in FIG. 11 (c), each unit coil 5 is independently placed in a cryocontainer 17, and the unit coil 5 is configured by connecting two layers of solenoid coils so that the inductance is substantially zero. Yes. That is, the first layer 18a of the right-handed coil is connected in the positive direction inside the grooved winding frame shown in FIG. 11 (d), and the second layer 18b flows in the negative direction outside the grooved winding frame. It is connected. Thereby, a non-inductive coil is formed. As shown in FIG. 11 (d), the superconducting tape 2 is wound around a groove 19 which is a square shape of a grooved winding frame and is spirally formed.
[0097]
Here, the electrodes 7e and 7s and the annular common connection members 10e and 10s may be formed by plating Ag or solder on an oxide superconductor having a critical temperature of 77.3K or higher in order to reduce Joule loss.
[0098]
The superconducting tape 2 used was a 1 μm oxide Y as shown in FIG.₁Ba₂Cu₃O_7-δ20 has a mesh shape deposited on a Hastelloy plate 22 of a mesh substrate having a width of 10 mm and a thickness of 0.1 mm through a YSZ plate 21 having a thickness of 1 μm. Also, the solenoid coil has a coefficient of thermal expansion of 1.6 × 10 in the coil direction.^-6Dyneema FRP [1 / K] was used.
[0099]
According to the fourth embodiment, a 66 kV class superconducting coil device for a current limiting element was manufactured for the current limiting element. Normally, it can be stably energized at 50 Hz AC up to a load factor of 95%, and the loss is as small as 30 W. Sometimes the resistance transition was uniform. In addition, the device had good performance as a current limiting device without deterioration.
[0100]
Next, a fifth embodiment of the present invention will be described. FIG. 13 is an explanatory view of a superconducting coil device for a current limiting element according to a fifth embodiment of the present invention, FIG. 13 (a) is a schematic perspective view, and FIG. 13 (b) is an explanatory view of a magnetic field application coil. is there.
[0101]
Here, the unit coil 5 of the superconducting coil device for the current limiting element is the same as that described in the third embodiment, but here, as a manufacturing method, the pancake coil is a pre-rolled FRP. The one made by the method of putting in the record-like groove of the board is used.
[0102]
As shown in FIG. 13A, the unit coils 5 are alternately arranged in an AC three-phase U-phase, V-phase, and W-phase, and as shown in FIG. 13B, an annular common connecting member 10u for each phase. Connect via 10v, 10w. And the magnetic field application coil 23 is arrange | positioned so that a magnetic field may be applied in the direction shown in FIG.13 (b) to the non-induction current limiting element superconducting coil apparatus in which all these three phases become one toroidal coil.
[0103]
The magnetic field applied here may be set so that Ic of the superconducting tape is 50% or less compared to when the magnetic field is not applied. For example, when Bi2223 superconducting tape is used, B: 0.3T or more is required from FIG. The uniformity of the magnetic field in the space in the superconducting coil device for the current limiting element is preferably within 5%.
[0104]
  According to the fifth embodiment, a 66 kV class superconducting coil device for a current limiting element was manufactured for a current limiting element. Normally, a current can be stably supplied up to a load factor of 91% at an alternating current of 50 Hz.10It was small with W, and the resistance transferred uniformly and quickly at the time of the accident. In addition, the device had good performance as a current limiting device without deterioration.
[0105]
Next, a sixth embodiment of the present invention will be described. In the sixth embodiment, a superconducting tape as shown in FIG. 14 is used as the superconducting tape 2 used in the second embodiment. That is, as in the second embodiment, a pancake coil made up of three oppositely configured coils is used, and the superconducting tape 2 used is shown in FIG.
[0106]
As shown in FIG. 14, 1 μm oxide Y₁Ba₂Cu₃O_7-δNo. 20 is deposited on a Hastelloy plate 22 having a projection of 0.2 mm on the back side with a width of 10 mm and a thickness of 0.1 mm via a 1 μm YSZ plate 21. The superconducting tape 2, the insulating plate, and the reinforcing material having irregularities on the back surface are wound as in the second embodiment. Do not use corrugated reinforcement.
[0107]
  According to the sixth embodiment, a 66 kV class superconducting coil device for a current limiting device was manufactured for the current limiting device. Normally, a current can be stably supplied at an AC 50 Hz up to a load factor of 91%.10WIn the event of an accident, resistance was transferred evenly and quickly. In addition, the device had good performance as a current limiting device without deterioration.
[0108]
Next, a seventh embodiment of the present invention will be described. FIG. 15 is an explanatory view of a seventh embodiment of the present invention, FIG. 15 (a) is an explanatory view of an insulator wire made by bonding cylindrical insulators at intervals, and FIG. 15 (b) is a drawing. It is explanatory drawing of the bifilar winding coil which wound the insulator and superconducting tape of 15 (a).
[0109]
  The unit coil 5 is a pancake coil wound by bifilar, as in the third embodiment. As shown in FIG. 15A, as an insulating plate, for example, an insulating cylinder 25 such as a GFRP having a thickness of 1 mm and a diameter of 1 cm for each 1 cm of an insulating wire 24 having a diameter of 1 mm made of an insulator such as fishing line. Use a mechanically bonded product. Insulator wire24 may be polyethylene. The insulating cylinder 25 may be a sphere, and the material may be aluminum nitride.
[0110]
The insulating plate, the superconducting tape, and the reinforcing material are wound as in the third embodiment as shown in FIG. Do not use corrugated reinforcement.
[0111]
According to the seventh embodiment, a 66 kV class superconducting coil device for a current limiting element was manufactured as a current limiting element. Normally, a current can be stably supplied at an AC 60 Hz up to a load factor of 96%, and the loss is as small as 9 W. Sometimes the resistance transition was uniform and quick. In addition, the device had good performance as a current limiting device without deterioration.
[0112]
Here, it is also possible to provide a cooling means between adjacent superconducting wires. As a result, heat generation can be cooled, and insulation can be achieved if the width of the cooling groove is determined in consideration of the insulation distance.
[0113]
【The invention's effect】
As described above, according to the present invention, since a non-inductive superconducting coil is formed in a toroid shape, a superconducting coil device for a current-limiting element that is stable, has low AC loss, and uniformly conducts normal conduction can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a coil configuration of a superconducting coil device for a current limiting element according to a first embodiment of the present invention.
FIG. 2 is a sectional view of a coil according to the first embodiment of the present invention.
FIG. 3 is a characteristic diagram showing the magnetic field dependence of the critical current density of the superconducting tape in the first embodiment of the present invention.
FIG. 4 is an explanatory diagram of a coil configuration of a superconducting coil device for a current limiting element according to a second embodiment of the present invention.
FIG. 5 is an explanatory diagram of a unit coil according to a second embodiment of the present invention, FIG. 5 (a) is an explanatory diagram of a characteristic concept of the unit coil, and FIG. 5 (b) is an explanatory diagram of how to wind the unit coil. FIG. 5C is an explanatory diagram of the superconducting wire of the unit coil.
FIG. 6 is a characteristic diagram showing a relationship between Ic of the Ag / Bi2223 tape and bending strain when obtaining the inner diameter of the minimum component coil of the unit coil in the second embodiment of the present invention.
FIGS. 7A and 7B are explanatory views of a current-limiting element superconducting coil device according to a third embodiment of the present invention, in which FIG. 7A is a perspective view and FIG. 7B is a plan view.
FIG. 8 is an explanatory diagram of a unit coil according to a third embodiment of the present invention.
FIG. 9 is an explanatory diagram of how to wind a unit coil according to a third embodiment of the present invention.
FIG. 10 is an explanatory diagram of how to wind between unit coils in the third embodiment of the present invention.
FIGS. 11A and 11B are explanatory views of a superconducting coil device for a current limiting element according to a fourth embodiment of the present invention, FIG. 11A is a schematic perspective view, FIG. 11B is a schematic side view thereof, FIG. 11 (c) is an explanatory view of the unit coil 5, and FIG. 11 (d) is an explanatory view of a grooved reel.
FIG. 12 is an explanatory diagram of a superconducting tape according to a fourth embodiment of the present invention.
FIGS. 13A and 13B are explanatory views of a superconducting coil device for a current limiting element according to a fifth embodiment of the present invention, FIG. 13A is a schematic perspective view, and FIG. 13B is an explanatory view of a magnetic field application coil; .
FIG. 14 is an explanatory diagram of a superconducting tape according to a sixth embodiment of the present invention.
15A and 15B are explanatory diagrams of a seventh embodiment of the present invention, in which FIG. 15A is an explanatory diagram of an insulator wire in which cylindrical insulators are bonded at intervals, and FIG. Explanatory drawing of the bifilar winding coil which wound the insulator and superconducting tape of Fig.15 (a).
[Explanation of symbols]
1 coil
2 Superconducting tape
3 Insulator
4 Reinforcing material
5 unit coil
6 Common connection members
7 electrodes
8 Coil
9 U-shaped connecting member
10 Ring common connecting member
11 FRP board
12 Record groove
13 Fixing tool
14 Reel for superconducting tape
15 Reinforcing material reel
16 Stiffener end fixture
17 Cryo container
24 Insulator wire
25 Insulator cylinder

Claims

In a superconducting coil device for a current limiting element in which a non-inductive coil wound with a superconducting wire is housed in a cryocontainer, a toroidal shape formed by moving a small circle having a radius smaller than the great circle along the circumference of the great circle A first superconducting wire wound around the circumference of the great circle and a second wound around the first superconducting wire while proceeding in the direction of the circumference of the great circle. A superconducting coil device for a current limiting element, comprising: a superconducting wire.

The superconducting coil device for a current limiting element according to claim 1, wherein the first and second superconducting wires have the same length .

3. The superconducting coil device for a current limiting element according to claim 1, further comprising a magnetic field application coil for applying a magnetic field in a direction perpendicular to the great circle .

The superconducting coil device for a current limiting element according to any one of claims 1 to 3, wherein the superconducting wire and the reinforcing material are wound at the same time .

The superconducting coil device for a current limiting element according to any one of claims 1 to 3, wherein the superconducting wire and the insulating material are wound simultaneously .

5. The superconducting coil device for a current limiting element according to claim 4 , wherein the reinforcing material is constituted by a wave-processed tape .

In a superconducting coil device for a current limiting element in which a non-inductive coil wound with a superconducting wire is housed in a cryocontainer, a toroidal shape formed by moving a small circle having a radius smaller than the great circle along the circumference of the great circle A superconducting coil device for a current-limiting element, comprising a plurality of unit coils each having a superconducting wire wound around an axis along the circumference of the great circle.

8. The superconducting coil device for a current limiting element according to claim 7 , further comprising a magnetic field applying coil for applying a magnetic field in a direction perpendicular to the great circle .

The unit coil is composed of two or more layers of solenoid coils configured to flow a reverse current every other layer so that the magnetic field generated on the axis of the unit coil is zero. The superconducting coil device for a current limiting element according to claim 7 or 8 , characterized in that it is characterized in that:

9. The pancake coil according to claim 7, wherein the unit coil is a pancake coil configured such that a reverse current flows alternately through a plurality of coils wound around an axis thereof . 10. Superconducting coil device for current limiting element.

The superconducting coil device for a current limiting element according to any one of claims 7 to 10, wherein the unit coil has three or more unit coils .

The limit according to any one of claims 7 to 11, wherein the unit coil is formed by laminating one or more stages of pancake coils in which two or more superconducting wires are wound and bifilar wound in an even number. Superconducting coil device for flow element.

The solenoid coil is composed of an insulator winding frame having a thermal expansion coefficient lower than that of the superconducting wire, and a rectangular groove larger than the width of the superconducting wire is engraved on the winding frame, along the groove. The superconducting coil device for a current limiting element according to claim 9 , wherein the superconducting coil device is wound .

The superconducting coil device for a current limiting element according to any one of claims 7 to 13, wherein the superconducting wire and the reinforcing material are wound simultaneously.

The superconducting coil device for a current limiting element according to any one of claims 7 to 14, wherein the superconducting wire and the insulating material are wound simultaneously.

15. The superconducting coil device for a current limiting element according to claim 14, wherein the reinforcing material is constituted by a wave-processed tape .

17. The unit coil according to claim 7, wherein the unit coil is formed by forming a groove-like groove of a record on a plate made of an insulating material, and inserting a superconducting wire into the groove . Superconducting coil device for current limiting element.

The unit coil forms a groove-like groove of a record on a plate made of an insulator, puts a spacer made of an insulator wider than the superconducting wire into the groove, and wraps the superconducting wire on the spacer The superconducting coil device for a current limiting element according to any one of claims 7 to 16 .

The current limiting element according to any one of claims 7 to 18, wherein a common connection member is disposed around the unit coil, and a terminal from each unit coil is electrically connected to the common connection member. Superconducting coil device.

The ring-shaped two common connection members are arrange | positioned around the said unit coil, and the terminal from each unit coil is electrically connected to a common connection member in any one of Claim 7 thru | or 18 characterized by the above-mentioned. The superconducting coil device for the current limiting element described.

The superconducting coil device for a current limiting element according to claim 17 or 18 , wherein the common connection member is made of an oxide superconductor .

The superconducting coil device for a current limiting element according to any one of claims 7 to 21, wherein each of the plurality of unit coils is housed in an independent cryocontainer .

The superconducting coil device for a current limiting element according to any one of claims 7 to 22, wherein a plurality of three-phase unit coils are arranged in a toroidal shape in the same order .