JP2006156163A - Superconductor and its manufacturing method - Google Patents

Superconductor and its manufacturing method Download PDF

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JP2006156163A
JP2006156163A JP2004345920A JP2004345920A JP2006156163A JP 2006156163 A JP2006156163 A JP 2006156163A JP 2004345920 A JP2004345920 A JP 2004345920A JP 2004345920 A JP2004345920 A JP 2004345920A JP 2006156163 A JP2006156163 A JP 2006156163A
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superconducting
layer
superconducting conductor
conductor
tape
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JP4609842B2 (en
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Shinichi Mukoyama
晋一 向山
Satoru Maruyama
悟 丸山
Noboru Ishii
登 石井
Osamu Sato
佐藤　　修
Masashi Yagi
正史 八木
Yukihiro Yagi
幸弘 八木
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Furukawa Electric Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a superconductive cable core which can protect an optical cable arranged inside from an external force. <P>SOLUTION: In the superconductive conductor in which a superconductive conductor layer composed of a plurality of superconductive wires that are wound in a twisted spiral shape, and a superconductive shield layer composed of a plurality of superconductive wires that are wound in a twisted spiral shape via an insulation layer are formed on a surface of an elastic former, a superconductive conductor is provided that has characteristics in that it is provided with a smooth and elastic layer on either or both of upper or lower faces of the superconductive conductor layer and the superconductive shield layer. The elastic smooth layer is formed by two or more of tape shaped bodies which are partially superposed mutually in the width direction, which are then wound into a spiral shape. Furthermore, in the elastic smooth layer, the superconductive conductor can retain elasticity under a superconductive temperature. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は電力送電用超電導ケーブル等に適用可能な可撓性を有する超電導導体に関し、特に曲げによる超電導特性劣化の少ない高温超電導導体に関する。   The present invention relates to a flexible superconducting conductor applicable to a superconducting cable for power transmission, and more particularly to a high-temperature superconducting conductor with little deterioration in superconducting characteristics due to bending.

近年、大電力低損失の電力輸送を実現するために、超電導導体、特に液体窒素温度で超電導状態になる酸化物超電導導体、例えばビスマス（Ｂｉ）系酸化物超電導であるＢｉ２Ｓｒ２Ｃａ２Ｃｕ３Ｏｘ線材等の電力ケーブルへの適用が検討されている。例えば、下記特許文献１で、可撓性を有するフォーマ上に、複数本のテープ状酸化物超電導多芯線、絶縁層テープ、複数本のテープ状酸化物超電導多芯線が順次に巻きつけて形成される超電導導体、及びこの超電導導体を用いたケーブルは開示されている。この超電導ケーブルは可撓性を有するフォーマによって可撓性が付与されており、ドラムに巻き付けてストック及び運搬の際、曲げ直径１．５ｍ曲げても超電導特性を実質的に劣化しない程度の可撓性を有する。 In recent years, in order to realize high-power and low-loss power transport, superconductors, particularly oxide superconductors that become superconductive at liquid nitrogen temperature, such as Bi 2 Sr 2 Ca 2 Cu, which is a bismuth (Bi) -based oxide superconductor, Application to power cables such as 3 O x wire is under study. For example, in Patent Document 1 below, a plurality of tape-shaped oxide superconducting multicore wires, an insulating layer tape, and a plurality of tape-shaped oxide superconducting multicore wires are sequentially wound on a flexible former. A superconducting conductor and a cable using the superconducting conductor are disclosed. This superconducting cable is provided with flexibility by a flexible former, so that the superconducting characteristics are not substantially deteriorated even if it is wound around a drum and bent at a bending diameter of 1.5 m at the time of stock and transportation. Have sex.

しかしながら、実際には、このような超電導ケーブルには、製造や運送又は布設などの作業時に更に大きな曲げ或は繰り返し曲げが発生し、これらの曲げによって超電導導体にも超電導特性が劣化する程の歪みがかかってしまう場合がある。曲げによる超電導ケーブルの超電導特性劣化の問題を解決するために、様々な工夫がされてきた。例えば、特許文献２に開示されたように、フォーマとフォーマ上に巻回されたテープ状超電導導体との間にグリース塗布層などのような潤滑層を設け、フォーマと超電導導体間の滑り性を改善し超電導導体にかかる曲げ歪みを緩和することを図った。 In practice, however, such superconducting cables are subjected to greater bending or repeated bending during operations such as manufacturing, transportation, or installation, and distortions that cause superconducting properties to deteriorate in the superconducting conductor due to these bendings. May occur. Various solutions have been made to solve the problem of deterioration of superconducting characteristics of superconducting cables due to bending. For example, as disclosed in Patent Document 2, a lubrication layer such as a grease coating layer is provided between the former and the tape-shaped superconducting conductor wound on the former, and the slipping property between the former and the superconducting conductor is improved. It was improved and the bending strain applied to the superconducting conductor was reduced.

又は、特許文献３に、フォーマ上にテープ状体をその隣接する側面が互いに接触しないように間隔（ギャップ）を開けて所定のピッチで螺旋状に巻いて、フォーマを長手方向に収縮可能とし、この収縮させたフォーマの外周に、テープ状超電導体を複数本、複数層配置の超電導導体を開示していた。優れた可撓性を有するフォーマから超電導導体に可撓性を付与し、超電導導体に曲げを加える時に折れ曲がりや破断がなくなり、超電導特性の低下を極力抑える効果が期待された。 Or, in Patent Document 3, a tape-like body is wound on the former in a spiral shape at a predetermined pitch with a gap (gap) so that adjacent side surfaces do not contact each other, and the former can be contracted in the longitudinal direction, A plurality of tape-shaped superconductors and a plurality of layers of superconducting conductors have been disclosed on the outer periphery of the contracted former. It was expected that the former having excellent flexibility imparts flexibility to the superconducting conductor, and when bending the superconducting conductor, there is no bending or breakage, and the effect of minimizing the deterioration of the superconducting characteristics is expected.

特許文献３のように、可撓性のある円筒状金属管をフォーマとし、超電導導体層及び超電導シールド層と接する面に、テープ状体をギャップを開けて所定ピッチで螺旋状に巻いてなる平滑層を備えた従来の超電導導体の１例を図３に示す。図３に、フォーマ１、平滑層２、超電導導体層３、内部半導電層４、絶縁層５、外部半導電層６、超電導シールド層７、保護層８からなる超電導導体２２を示す。フォーマ１は可撓性を有する円筒状の金属管、例えば、金属テープを螺旋状に巻きつけたスパイラル管や、銅線を撚り合せた撚り線導体や、波付け金属管などを用いる。フォーマ１の表面凹凸を平滑にするために、フォーマ１の外周にクラフト紙やカーボン紙等のテープでギャップ１０を開けて、１層若しくは数層螺旋状に巻き付けて平滑層２を形成している。平滑層２の外側には、複数本のテープ状の超電導線９が螺旋状に巻きつけられて超電導導体層３を形成している。超電導導体層３の外側には、クラフト紙などからなるテープを多層に巻き付けて絶縁層５を形成するが、超電導電界を緩和する目的、及び超電導導体層３と超電導シールド層７に平滑な接触面を与える目的で、絶縁層５の内側と外側に、カーボン紙等の半導電性テープを前記平滑層２と同様にギャップ１０を開けて１層若しくは数層螺旋状に巻き付けて、内部半導電層４と外部半導電層６を形成している。外部半導電層６の外周には、複数本の超電導線９を所定ピッチで螺旋状に巻線して超電導シールド層７を形成している。超電導シールド層７の外側には、外部から保護する目的でクラフト紙などからなるテープを多層巻回して保護層８を形成するが、保護層８の内側に、前記クラフト紙テープをギャップ１０を開けて螺旋状に巻きつけ、超電導シールド層７に接する面を平滑させる。 As in Patent Document 3, a flexible cylindrical metal tube is used as a former, and a tape-like body is spirally wound at a predetermined pitch on a surface in contact with the superconducting conductor layer and the superconducting shield layer. An example of a conventional superconducting conductor having a layer is shown in FIG. FIG. 3 shows a superconducting conductor 22 comprising a former 1, a smooth layer 2, a superconducting conductor layer 3, an internal semiconductive layer 4, an insulating layer 5, an external semiconductive layer 6, a superconducting shield layer 7, and a protective layer 8. The former 1 uses a flexible cylindrical metal tube, for example, a spiral tube in which a metal tape is spirally wound, a stranded wire conductor in which a copper wire is twisted, a corrugated metal tube, or the like. In order to smooth the surface unevenness of the former 1, a smooth layer 2 is formed by opening a gap 10 with a tape such as kraft paper or carbon paper around the outer periphery of the former 1 and winding it in one layer or several layers spirally. . A plurality of tape-shaped superconducting wires 9 are spirally wound outside the smooth layer 2 to form the superconducting conductor layer 3. Outside the superconducting conductor layer 3, a tape made of kraft paper or the like is wound in multiple layers to form an insulating layer 5. The purpose of relaxing the superconducting field, and a smooth contact surface between the superconducting conductor layer 3 and the superconducting shield layer 7 In order to provide the inner semiconductive layer, a semiconductive tape such as carbon paper is wound around one or several layers in a spiral manner with a gap 10 in the same manner as the smooth layer 2 on the inside and outside of the insulating layer 5. 4 and an external semiconductive layer 6 are formed. On the outer periphery of the external semiconductive layer 6, a superconducting shield layer 7 is formed by winding a plurality of superconducting wires 9 spirally at a predetermined pitch. On the outside of the superconducting shield layer 7, a protective layer 8 is formed by wrapping a tape made of kraft paper or the like for the purpose of protection from the outside, and the kraft paper tape is opened inside the protective layer 8 with a gap 10. The surface in contact with the superconducting shield layer 7 is smoothed by being spirally wound.

上記超電導導体２２において、平滑層２と内部半導電層４は超電導体層３の内側と外側に、また、外部半導電層６と平滑層２は超電導シールド層７の内側と外側に、ギャップ１０を開けて螺旋状に巻回して形成されるが、ギャップ１０を開ける目的は、超電導導体が曲げられた時に、超電導導体層３と超電導シールド層７に接するテープに皺がより、その皺が超電導線９を傷つけることが無いようにするためである。このギャップ１０の間隔が曲げの内側では狭くなり、外側では広くなることで曲げ歪みはギャップ１０によって吸収されることである。 In the superconducting conductor 22, the smooth layer 2 and the inner semiconductive layer 4 are on the inside and outside of the superconductor layer 3, and the outer semiconductive layer 6 and the smooth layer 2 are on the inside and outside of the superconducting shield layer 7, with a gap 10. The purpose of opening the gap 10 is that when the superconducting conductor is bent, the tape is in contact with the superconducting conductor layer 3 and the superconducting shield layer 7 and the wrinkle is superconducting. This is to prevent the line 9 from being damaged. The gap 10 is absorbed by the gap 10 because the gap 10 becomes narrow inside the bend and widened outside.

特開平７−１６９３４３号公報JP-A-7-169343 特開平５−１４４３３３号公報JP-A-5-144333 特開２００２−１５６２９号公報JP 2002-15629 A

しかしながら、上述のように、超電導導体層３或は超電導シールド層７と接する面にギャップ１０を開けたテープ巻回層が形成されると、超電導線９に曲げや側圧が加わった場合、線材は上面または下面に押し付けられる。その際、超電導線９がテープ巻回層のギャップ１０に落ち込み、更に超電導導体層３或は超電導シールド層７の上面または下面がギャップ１０のエッジに押し付けられて超電導線９にダメージを与える。図４は超電導導体層３とその両側にギャップを開けたテープ巻回層を示す図である。更に、超電導線９がギャップ１０に落ち込む様子を拡大して図４−Ａと図４−Ｂ図に示す。図４−Ａの場合、超電導線９に曲げ歪み又はギャップ１０のエッジで局所的にせん断力が加えられ、超電導線９を折るなどのダメージが与えられる。図４−Ｂの場合は、超電導線９の上面と下面にテープ巻回層のギャップ１０が一致していて、超電導線９は上下とも拘束されることなくフリーとなるために、線の折れ幅が大きく、最悪は線が切れてしまうこともあり得る。これらのことによる結果は、超電導導体に流せる電流が著しく低下する問題が生じた。   However, as described above, when a tape winding layer with a gap 10 is formed on the surface in contact with the superconducting conductor layer 3 or the superconducting shield layer 7, when bending or lateral pressure is applied to the superconducting wire 9, Pressed against the top or bottom surface. At this time, the superconducting wire 9 falls into the gap 10 of the tape winding layer, and the upper surface or the lower surface of the superconducting conductor layer 3 or the superconducting shield layer 7 is pressed against the edge of the gap 10 to damage the superconducting wire 9. FIG. 4 is a view showing the superconducting conductor layer 3 and a tape winding layer with a gap formed on both sides thereof. Further, the manner in which the superconducting wire 9 falls into the gap 10 is enlarged and shown in FIGS. 4-A and 4-B. In the case of FIG. 4A, bending stress or a shearing force is locally applied to the superconducting wire 9 at the edge of the gap 10, and damage such as bending of the superconducting wire 9 is given. In the case of FIG. 4-B, since the gap 10 of the tape winding layer coincides with the upper surface and the lower surface of the superconducting wire 9 and the superconducting wire 9 is free without being constrained at the top and bottom, The worst is that the line may break. As a result of these things, there arises a problem that the current that can be passed through the superconducting conductor is significantly reduced.

本発明は、上記問題に鑑みてなされたものであって、曲げ歪みによって超電導特性の劣化が生じない大電流を流せて十分な可撓性を有する超電導導体を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a superconducting conductor having sufficient flexibility by flowing a large current that does not cause deterioration of superconducting characteristics due to bending strain.

上記の目的を達成するために、本発明は、可撓性を有するフォーマの表面に、複数本の超電導線が螺旋状に巻きつけてなる超電導導体層と、複数本の超電導線が螺旋状に巻き付けてなる超電導シールド層が、絶縁層を介して形成された超電導導体において、前記超電導導体層および前記超電導シールド層の上面と下面のいずれか、または両面に、伸縮性を有する平滑層を備えることを特徴とする超電導導体を提供する。 In order to achieve the above object, the present invention provides a superconducting conductor layer in which a plurality of superconducting wires are spirally wound around the surface of a flexible former, and a plurality of superconducting wires spirally. The superconducting shield layer formed by wrapping the superconducting conductor formed via an insulating layer includes a smoothing layer having elasticity on one or both of the superconducting conductor layer and the upper and lower surfaces of the superconducting conductor layer. A superconducting conductor is provided.

また、可撓性の有するフォーマの表面に、超電導導体層が複数本の超電導線より螺旋状に巻きつけて形成された超電導導体において、超電導導体層の上面と下面のいずれか、または両面に、伸縮性を有する平滑層を備えることを特徴とする超電導導体を提供する。 Further, in a superconducting conductor formed by spirally winding a plurality of superconducting wires on the surface of a flexible former, either the upper surface or the lower surface of the superconducting conductor layer, or both sides, Provided is a superconducting conductor comprising a smooth layer having elasticity.

前記伸縮性を有する平滑層は、前記超電導導体が超電導状態となる温度下に於いても伸縮性が保たれることを特徴とするものである。 The smooth layer having stretchability is characterized in that stretchability is maintained even at a temperature at which the superconducting conductor is in a superconducting state.

また、前記伸縮性平滑層は、２本以上のテープ状体が幅方向に一部重ね合わせ、螺旋状に巻きつけて形成されるものである。 The stretchable smooth layer is formed by two or more tape-like bodies partially overlapped in the width direction and wound spirally.

また、前記伸縮性平滑層は、金属テープ状体と非金属テープ状体からなるものである。 The stretchable smooth layer comprises a metal tape-like body and a non-metal tape-like body.

更に、前記超電導導体の製造方法と、前記超電導導体を用いた超電導ケーブル及び超電導ケーブルの製造方法を提供する。 Furthermore, the manufacturing method of the said superconducting conductor, the superconducting cable using the said superconducting conductor, and the manufacturing method of a superconducting cable are provided.

本発明は、可撓性を有するフォーマの表面に、複数本の超電導線を螺旋状に巻き付けてなる超電導導体層と、複数本の超電導線を螺旋状に巻き付けてなる超電導シールド層が、絶縁層を介して形成された超電導導体において、前記超電導導体層および前記超電導シールド層の上面と下面のいずれか、または両面に、伸縮性平滑層を設けることにより、可撓性に優れると共に、超電導導体に曲げ歪みが加わった時に、超電導導体層または超電導シールド層が接する面の表面形状により傷つけることが無く、超電導導体の性能低下が抑制できることである。   The present invention provides a superconducting conductor layer in which a plurality of superconducting wires are spirally wound around a flexible former surface, and a superconducting shield layer in which a plurality of superconducting wires are spirally wound. In the superconducting conductor formed via, by providing a stretchable smooth layer on either or both of the upper and lower surfaces of the superconducting conductor layer and the superconducting shield layer, the superconducting conductor has excellent flexibility and When bending strain is applied, the superconducting conductor layer or the superconducting shield layer is not damaged by the surface shape of the surface, and the performance degradation of the superconducting conductor can be suppressed.

また、前記伸縮性平滑層は２本以上のテープ状体を幅方向に一部重ね合わせて形成されるので、従来の超電導導体で生じた超電導線が平滑層のギャップに落ち込み、更にギャップのエッジによりダメージを受けることが無くなる。 Further, since the stretchable smooth layer is formed by overlapping two or more tape-like bodies partially in the width direction, the superconducting wire generated in the conventional superconducting conductor falls into the gap of the smooth layer, and further, the edge of the gap No longer takes damage.

更に、上記伸縮性平滑層は超電導導体が超電導状態となる温度下においても伸縮性が保たれるので、通電状態にある超電導導体の臨界電流低下を防ぐと共に、超電導導体が可撓性に優れかつ長尺超電導導体およびケーブルを得ることが可能となる。 Furthermore, since the stretchable smooth layer maintains stretchability even at a temperature at which the superconducting conductor is in a superconducting state, the superconducting conductor is excellent in flexibility and prevents a decrease in the critical current of the superconducting conductor in an energized state. It becomes possible to obtain a long superconducting conductor and a cable.

以下、本発明を実施するための最良形態を示す。
図１は本発明に係わる超電導導体の概略図である。 The best mode for carrying out the present invention will be described below.
FIG. 1 is a schematic view of a superconducting conductor according to the present invention.

金属テープを螺旋状に巻きつけたスパイラル管や、銅線を撚り合せた撚り線導体や、波付け金属管などの可撓性を持つ金属管をフォーマ１として用いる。フォーマ１の表面に、図２に示していたように、２本のテープ状体１２、１３が互いに幅方向に一部重なるようにラップして螺旋状に巻きつけられて伸縮性平滑層１１を形成している。 A flexible metal tube such as a spiral tube in which a metal tape is spirally wound, a stranded wire conductor obtained by twisting a copper wire, or a corrugated metal tube is used as the former 1. As shown in FIG. 2, the two tape-like bodies 12 and 13 are wrapped around the surface of the former 1 so as to partially overlap each other in the width direction, and are wound spirally to form the stretchable smooth layer 11. Forming.

この伸縮性平滑層１１の上に、複数本の超電導線９が所定ピッチで螺旋状に巻きつけられて超電導導体層３を形成している。次いで、電解を緩和する目的で内部半導電層４が形成されるが、超電導導体層３に接する内部半導電層４の内面に前記伸縮性平滑層２を形成している。 A plurality of superconducting wires 9 are spirally wound at a predetermined pitch on the stretchable smooth layer 11 to form the superconducting conductor layer 3. Next, the inner semiconductive layer 4 is formed for the purpose of relaxing electrolysis, and the stretchable smooth layer 2 is formed on the inner surface of the inner semiconductive layer 4 in contact with the superconducting conductor layer 3.

内部半導電層４の外周に、テープ状のクラフト紙がギャップ１０を開けて複数層螺旋状に巻きつけられて絶縁層５を形成している。 Tape-like kraft paper is wound around the outer periphery of the inner semiconductive layer 4 with a gap 10 to form a plurality of layers in a spiral manner to form an insulating layer 5.

絶縁層５の外周には、電界を緩和するために外部半導電層６と、複数本の超電導線９が螺旋状に巻きつけられてなる超電導シールド層７と、外部からの保護を目的にして保護テープを螺旋状に多層巻きつけてなる保護層８が、順次に形成されるが、超電導シールド層７に接する外部半導電層６の外面と保護層８の内面に、前記伸縮性平滑層１１を設けている。 On the outer periphery of the insulating layer 5, an external semiconductive layer 6, a superconducting shield layer 7 in which a plurality of superconducting wires 9 are spirally wound to relax the electric field, and protection from the outside A protective layer 8 formed by winding a protective tape in a multi-layered manner is formed in sequence, and the stretchable smooth layer 11 is formed on the outer surface of the outer semiconductive layer 6 in contact with the superconducting shield layer 7 and the inner surface of the protective layer 8. Is provided.

本発明において、前記伸縮性平滑層１１は、２本のテープ状体１２、１３が互い一部重なって螺旋状に巻きつけて形成される。超電導導体が超電導状態となる温度下で伸縮性平滑層１１の伸縮性が保てば、テープ状体１２、１３の材質、または、組合せに特に限定はないが、好ましくは金属テープ状体と非金属テープ状体の組み合わせが良い。テープ状体は、金属の場合、アルミニウム、銅またはそれらの合金、非金属の場合は、クラフト紙、カーボン紙、ポリイミドなどを用いることが出来る。更に、テープ状体の寸法について、特に限定はないが、製造上便利になる理由で、組合わせテープの寸法は同じであることが好ましい。また、テープ状体の重なる量は約テープ幅の１／２以下、好ましくは１／３程度が良い。 In the present invention, the stretchable smooth layer 11 is formed by two tape-like bodies 12 and 13 partially overlapping each other and spirally wound. As long as the stretchability of the stretchable smooth layer 11 is maintained at a temperature at which the superconducting conductor is in a superconducting state, the material or combination of the tape-like bodies 12 and 13 is not particularly limited. A combination of metal tapes is good. As the tape-like body, aluminum, copper, or an alloy thereof can be used in the case of a metal, and craft paper, carbon paper, polyimide, or the like can be used in the case of a nonmetal. Further, the dimensions of the tape-like body are not particularly limited, but it is preferable that the dimensions of the combination tape are the same for the convenience of manufacturing. The overlapping amount of the tape-like body is about ½ or less, preferably about ３ of the tape width.

本発明において、前記超電導導体層３と超電導シールド層７を形成する超電導線９材として、金属超電導体線材或は酸化物超電導体線材のいずれかでよい。酸化物超電導線材には、酸化物超電導として、例えば、Ｙ１ Ｂａ2Ｃｕ3Ｏ７−ｘ温（０≦Ｘ＜１）等のイットリウム系、Ｂｉ２ Ｓｒ2Ｃａ２Ｃｕ3Ｏ１０−Ｙ（０≦Ｙ＜１）等のビスマス（Bi）系、またはＴｌ２ Ｓｒ2Ｃａ２Ｃｕ3Ｏ１０−Ｚ（（０≦Ｚ＜１）等のタリウム系酸化物超電導体に、銀または銀マグネシウム合金シースを施してなる高温超電導テープ等を用いることができる。金属超電導線材には、ＮｂＴｉ、Ｎｂ３Ｓｎ等のテープ状超電導線材が挙げられる。 In the present invention, the superconducting wire 9 forming the superconducting conductor layer 3 and the superconducting shield layer 7 may be either a metal superconductor wire or an oxide superconductor wire. In the oxide superconducting wire, as oxide superconductivity, for example, Y 1 Ba 2 Cu 3 O 7-x temperature (0 ≦ X <1) or the like, Bi 2 Sr 2 Ca 2 Cu 3 O 10-Y ( Bismuth (Bi) such as 0 ≦ Y <1), or thallium oxide superconductor such as Tl 2 Sr 2 Ca 2 Cu 3 O 10-Z ((0 ≦ Z <1), silver or silver magnesium alloy A high-temperature superconducting tape formed with a sheath can be used, and examples of the metal superconducting wire include tape-shaped superconducting wires such as NbTi and Nb 3 Sn.

また、上記の本発明では、超電導導体層３と超電導シールド層７の上面と下面の両方に伸縮性平滑層１１を設けたが、上面または下面のいずれかの一方でも超電導導体の劣化を抑えることが出来、効果的である。 In the present invention, the stretchable smooth layer 11 is provided on both the upper surface and the lower surface of the superconducting conductor layer 3 and the superconducting shield layer 7. However, the deterioration of the superconducting conductor is suppressed on either the upper surface or the lower surface. Can be effective.

図１は本実施例を説明するための本発明に係わる超電導導体２１の概略図である。
可撓性を有する直径３０mmの波付き銅管をフォーマ１に用い、フォーマ１の表面に伸縮性平滑層１１を形成した。伸縮性平滑層１１は、図２に示しているように、アルミテープ１２とカーボン紙テープ１３の２本のテープ状体からなり、テープの幅方向に、互いにテープ幅１／３程度重ねるようにラップして、フォーマ１の上に螺旋状に巻き付けていた。アルミテープ１２とカーボン紙テープ１３の断面寸法は共に、幅２０mm、厚さ０．１mmである。 FIG. 1 is a schematic view of a superconducting conductor 21 according to the present invention for explaining the present embodiment.
A flexible corrugated copper tube having a diameter of 30 mm was used for the former 1, and the stretchable smooth layer 11 was formed on the surface of the former 1. As shown in FIG. 2, the stretchable smooth layer 11 is composed of two tape-like bodies of an aluminum tape 12 and a carbon paper tape 13, and is wrapped so that the tape width is overlapped by about 1/3 in the tape width direction. Then, it was spirally wound on the former 1. Both the aluminum tape 12 and the carbon paper tape 13 have a cross-sectional dimension of 20 mm in width and 0.1 mm in thickness.

伸縮性平滑層１１の外側に、２０本のテープ状超電導線９が、３００mmのピッチで螺旋状に巻き付けられて超電導導体層３を形成した。超電導線９は銀被覆されたBi2 Sr2 Ca2 Cu3 Ox 線材であり、断面寸法は幅４mm、厚さ０．２mmである。 Twenty tape-shaped superconducting wires 9 were spirally wound at a pitch of 300 mm on the outside of the stretchable smooth layer 11 to form the superconducting conductor layer 3. The superconducting wire 9 is a silver-coated Bi 2 Sr 2 Ca 2 Cu 3 O x wire, and has a cross-sectional dimension of 4 mm in width and 0.2 mm in thickness.

超電導導体層３の上面には、テープ状のカーボン紙で１mm程のギャップ１０を開けて内部半導電層４が形成されるが、超電導導体層３に接する内部半導電層４の内面に前記伸縮性平滑層１１を設けた。内部半導電層４の上に絶縁層５は、幅２０mm、厚さ０．１５mmのクラフト紙を１mmのギャップ１０を開けて数十層螺旋状巻き付けて形成された。 An internal semiconductive layer 4 is formed on the upper surface of the superconducting conductor layer 3 with a gap of about 1 mm made of tape-like carbon paper. The expansion and contraction is applied to the inner surface of the inner semiconductive layer 4 in contact with the superconducting conductor layer 3. The smoothness layer 11 was provided. The insulating layer 5 was formed on the inner semiconductive layer 4 by spirally winding several tens of layers of kraft paper having a width of 20 mm and a thickness of 0.15 mm with a gap 10 of 1 mm.

絶縁層５の上に、前記内部半導電層４と同様な方法で外部半導電層６を形成し、更に、３０本の超電導線９を巻き付けてなる超電導シールド層７は、前記伸縮性平滑層１１を介して外部半導電層６の外周に形成された。超電導シールド層７に用いた超電導線９の材質、寸法及び巻き付ける方法は前記超電導導体層３と同じであった。 An outer semiconductive layer 6 is formed on the insulating layer 5 in the same manner as the inner semiconductive layer 4, and the superconducting shield layer 7 formed by winding 30 superconducting wires 9 is formed of the stretchable smooth layer. 11 on the outer periphery of the external semiconductive layer 6. The material, dimensions and winding method of the superconducting wire 9 used for the superconducting shield layer 7 were the same as those of the superconducting conductor layer 3.

超電導シールド層７の上面には、外部からの保護を目的にしてテープ状クラフト紙を１mm程度のギャップを開けて螺旋状に数層巻き付けて保護層８を形成するが、超電導シールド層７と接する面に前記伸縮性平滑層１１を設けた。 On the upper surface of the superconducting shield layer 7, a protective layer 8 is formed by spirally winding several layers of tape-like kraft paper with a gap of about 1 mm for the purpose of protection from the outside. The stretchable smooth layer 11 was provided on the surface.

また、本発明と比較するための比較例として、図３に示していた従来のギャップ巻きの超電導導体２２を作成した。 As a comparative example for comparison with the present invention, the conventional gap winding superconducting conductor 22 shown in FIG. 3 was prepared.

更に、上記本発明の超電導導体２１と従来の技術による超電導導体２２の臨界電流Icを評価した。評価は、超電導導体の製造直後及び曲げ直径１．０ｍで曲げを行った後のIcと超電導導体の積算電流と比較することによって行われた。 Furthermore, the critical current Ic of the superconducting conductor 21 of the present invention and the conventional superconducting conductor 22 was evaluated. The evaluation was performed by comparing Ic after bending of the superconducting conductor with a bending diameter of 1.0 m and the integrated current of the superconducting conductor.

結果は、本発明の超電導導体２１では、製造直後、曲げ直径１．０ｍ曲げた後も、Icの劣化は見られなかったが、従来技術による超電導導体２２では、製造直後でIcは約８５％、更に曲げ直径１．０ｍの曲げを行ったところIcは約６０％まで劣化してしまった。劣化の原因を解体調査した結果、ギャップに位置する部分の超電導線が折れていたことが分かった。一方、本発明による超電導導体では、超電導線に折れなどは観測されなかった。 As a result, in the superconducting conductor 21 of the present invention, Ic was not deteriorated immediately after manufacturing and after bending of a bending diameter of 1.0 m. However, in the superconducting conductor 22 according to the prior art, Ic was about 85% immediately after manufacturing. Further, when bending with a bending diameter of 1.0 m was performed, Ic deteriorated to about 60%. As a result of dismantling the cause of the deterioration, it was found that the superconducting wire in the gap was broken. On the other hand, in the superconducting conductor according to the present invention, no breakage or the like was observed in the superconducting wire.

なお、本発明の超電導導体２１と従来技術による超電導導体２２のいずれも、２０本の超電導線９を螺旋状に巻き付けて形成され、超電導線９の１本あたりの平均Icは５０Aとして、積算された超電導導体のIcは1000Aとなる。 Note that both the superconducting conductor 21 of the present invention and the superconducting conductor 22 according to the prior art are formed by spirally winding 20 superconducting wires 9, and the average Ic per superconducting wire 9 is 50A. The Ic of the superconducting conductor is 1000A.

なお、上記本発明では、超電導導体層と超電導シールド層に接する上面と下面の両面に伸縮性平滑層１１を備えていたが、上面または下面の何れの一方の面でも効果がある。 In the present invention, the stretchable smooth layer 11 is provided on both the upper surface and the lower surface in contact with the superconducting conductor layer and the superconducting shield layer. However, either one of the upper surface and the lower surface is effective.

本発明に係わる超電導導体の概略説明図Schematic illustration of superconducting conductor according to the present invention 本発明に係わる超電導導体における超電導導体層及びその上面と下面に設けた伸縮性平滑層の長手方向断面図Longitudinal sectional view of the superconducting conductor layer and the stretchable smooth layer provided on the upper and lower surfaces thereof in the superconducting conductor according to the present invention. 従来技術による超電導導体の概略説明図Schematic illustration of a superconducting conductor according to the prior art 従来技術による超電導導体における超電導導体層及びその上面と下面に設けた巻回層の長手方向断面図Longitudinal sectional view of a superconducting conductor layer and a winding layer provided on the upper and lower surfaces of the superconducting conductor according to the prior art 超電導線がギャップに落ち込む様子の断面図Cross section of superconducting wire falling into gap 超電導線がギャップに落ち込む様子の断面図Cross section of superconducting wire falling into gap

符号の説明Explanation of symbols

０００１： フォーマ
０００２： 平滑層
０００３： 超電導導体層
０００４： 内部半導電層
０００５： 絶縁層
０００６： 外部半導電層
０００７： 超電導シールド層
０００８： 保護層
０００９： 超電導線
００１０： ギャップ
００１１： 伸縮性平滑層
００１２、００１３： テープ状体
００２１： 本発明に係わる超電導導体
００２２： 従来技術による超電導導体

0001: Former 0002: Smooth layer 0003: Superconducting conductor layer 0004: Internal semiconductive layer 0005: Insulating layer 0006: External semiconductive layer 0007: Superconducting shield layer 0008: Protective layer 0009: Superconducting wire 0010: Gap 0011: Stretchable smooth layer 0012, 0013: Tape-like body 0021: Superconducting conductor 0022 according to the present invention: Superconducting conductor according to the prior art

Claims (8)

可撓性を有するフォーマの表面に、複数本の超電導線を螺旋状に巻き付けてなる超電導導体層と、複数本の超電導線を螺旋状に巻き付けてなる超電導シールド層が、絶縁層を介して形成された超電導導体において、前記超電導導体層および前記超電導シールド層の上面或は下面のいずれか、または両面に、伸縮性を有する平滑層を備えることを特徴とする超電導導体。 A superconducting conductor layer in which a plurality of superconducting wires are spirally wound on a surface of a flexible former and a superconducting shield layer in which a plurality of superconducting wires are spirally wound are formed via an insulating layer. A superconducting conductor comprising a smoothing layer having elasticity on either or both of the upper and lower surfaces of the superconducting conductor layer and the superconducting shield layer. 可撓性の有するフォーマの表面に、複数本の超電導線を螺旋状に巻き付けてなる超電導導体層が形成された超電導導体において、前記超電導導体層の上面或は下面のいずれか、または両面に、伸縮性を有する平滑層を備えることを特徴とする超電導導体。 In a superconducting conductor in which a superconducting conductor layer formed by spirally winding a plurality of superconducting wires is formed on the surface of a flexible former, either the upper surface or the lower surface of the superconducting conductor layer, or both sides, A superconducting conductor comprising a smooth layer having elasticity. 前記伸縮性を有する平滑層は、前記超電導導体が超電導状態となる温度下に伸縮性が保てることを特徴とする請求項１または２に記載の超電導導体。 3. The superconducting conductor according to claim 1, wherein the stretchable smooth layer can maintain stretchability at a temperature at which the superconducting conductor is in a superconducting state. 4. 前記伸縮性平滑層は、２本以上のテープ状体が幅方向に一部重ね合わせ、螺旋状に巻きつけて形成されることを特徴とする請求項１〜３に記載の超電導導体。 The superconducting conductor according to any one of claims 1 to 3, wherein the stretchable smooth layer is formed by two or more tape-like bodies partially overlapped in the width direction and wound spirally. 前記伸縮性平滑層は、金属テープ状体と非金属テープ状体からなることを特徴とする請求項４に記載の超電導導体。 The superconducting conductor according to claim 4, wherein the stretchable smooth layer comprises a metal tape-like body and a non-metal tape-like body. 請求項１〜５のいずれかの１項に記載の超電導導体の製造方法。 The manufacturing method of the superconducting conductor of any one of Claims 1-5. 請求項６に記載の超電導導体を用いた超電導ケーブル。 A superconducting cable using the superconducting conductor according to claim 6. 請求項７に記載の超電導ケーブルの製造方法。


A method for manufacturing a superconducting cable according to claim 7.


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CN105719737A (en) * 2016-01-24 2016-06-29 安徽华星电缆集团有限公司 180-DEG C motor connection heat-resisting drainage wire
CN105551596A (en) * 2016-01-27 2016-05-04 安徽光复电缆有限公司 160-DEG C flexible motor lead and drainage cable

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