JP4980254B2 - Superconducting cable terminal connection structure - Google Patents

Superconducting cable terminal connection structure Download PDF

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JP4980254B2
JP4980254B2 JP2008007463A JP2008007463A JP4980254B2 JP 4980254 B2 JP4980254 B2 JP 4980254B2 JP 2008007463 A JP2008007463 A JP 2008007463A JP 2008007463 A JP2008007463 A JP 2008007463A JP 4980254 B2 JP4980254 B2 JP 4980254B2
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connection
superconducting
fitting
connection sleeve
sleeve
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JP2009170275A (en
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祐一 芦辺
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Tokyo Electric Power Co Inc
Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Description

本発明は、超電導ケーブルの超電導導体層が、接続スリーブ及びリング状の連結金具を介して、常電導側導体に導通接続される超電導ケーブルの端末接続部構造に関し、特に、接続スリーブを回り止め状態に固定するようにした超電導ケーブルの端末接続部構造に関する。   The present invention relates to a superconducting cable terminal connection structure in which a superconducting conductor layer of a superconducting cable is conductively connected to a normal conducting side conductor via a connecting sleeve and a ring-shaped connecting bracket, and in particular, the connection sleeve is prevented from rotating. The present invention relates to a terminal connection part structure of a superconducting cable fixed to a cable.

超電導線材として、Bi-Sr-Ca-Cu-Oテープ線材に代表されるBi系超電導テープ線材が実用化されつつある。このようなBi系超電導テープ線材を用いた３心一括型の超電導ケーブルは、例えば図４に示すように構成される。即ち、常電導線材からなるフォーマ１を中心として、その外周に、Bi系超電導テープ線材からなる超電導導体層２、絶縁層３、Bi系超電導テープ線材からなる超電導シールド層４が形成され、これらでケーブルコア９が形成される。そして、３本のケーブルコア９が互いに撚り合わされて内管６と外管７とで形成される二重断熱管に収納され、内管６内に冷媒流通路５が形成される。また、外管７は防食層８によって覆われ、内管６と外管７の間は真空引きされて真空層とされる。   Bi-based superconducting tape wires represented by Bi-Sr-Ca-Cu-O tape wires are being put into practical use as superconducting wires. A three-core superconducting cable using such a Bi-based superconducting tape wire is configured, for example, as shown in FIG. That is, a superconducting conductor layer 2 made of a Bi-based superconducting tape wire, an insulating layer 3, and a superconducting shield layer 4 made of a Bi-based superconducting tape wire are formed around the former 1 made of a normal conducting wire. A cable core 9 is formed. Then, the three cable cores 9 are twisted together and accommodated in a double heat insulating tube formed by the inner tube 6 and the outer tube 7, and the refrigerant flow passage 5 is formed in the inner tube 6. Further, the outer tube 7 is covered with the anticorrosion layer 8, and the space between the inner tube 6 and the outer tube 7 is evacuated to form a vacuum layer.

このような超電導ケーブル１０の超電導層（超電導導体層）２を常温側導体と接続する場合には、従来、例えば図５に示すような端末接続構造が採用されていた(例えば特許文献1，２参照)。即ち、超電導ケーブルから撚りを戻されたケーブルコア９の絶縁層３から超電導層２が段剥ぎ状態に露出され、その超電導層２が、接続部Ｊにおいて、常電導導体であるエポキシユニット１１の中心導体１２の一端と接続される。その中心導体１２の他端が、終端接続箱(図示省略)内に収納された冷媒槽１３内に導入され、圧縮スリーブ１４及び編組線１５を介して常温側導体（ブッシング）１６と冷媒中で接続され、その接続部が電界シールド１７で覆われる。尚、上記接続部Ｊは、終端接続箱に接続された補助接続箱(図示省略)内に設けた冷媒槽１８内の冷媒中に浸漬される。   When connecting a superconducting layer (superconducting conductor layer) 2 of such a superconducting cable 10 to a room temperature side conductor, a terminal connection structure as shown in FIG. 5 has been conventionally employed (for example, Patent Documents 1 and 2). reference). That is, the superconducting layer 2 is exposed in a stepped state from the insulating layer 3 of the cable core 9 untwisted from the superconducting cable, and the superconducting layer 2 is connected to the center of the epoxy unit 11 which is a normal conducting conductor at the connection portion J. Connected to one end of the conductor 12. The other end of the center conductor 12 is introduced into a refrigerant tank 13 housed in a termination junction box (not shown), and is connected to the room temperature side conductor (bushing) 16 and the refrigerant via the compression sleeve 14 and the braided wire 15. The connection portion is covered with the electric field shield 17. In addition, the said connection part J is immersed in the refrigerant | coolant in the refrigerant tank 18 provided in the auxiliary | assistant connection box (illustration omitted) connected to the termination | terminus connection box.

接続部Ｊの構成について詳しく説明すると、段剥ぎされた超電導導体層２の先端が、半田によって接続スリーブ１９の一端に接続され、かつ超電導ケーブルのフォーマは接続スリーブ１９内に圧縮接続されて中心導体１２との間の引っ張り強度が確保される。その接続スリーブ１９の他端が、導電性弾性部材からなるマルチバンドｍを介して、エポキシユニット１１の中心導体１２に導通接続される。そして、接続スリーブ１９の他端に、リング状の連結金具２０の一端が螺合され、連結金具２０の他端が、エポキシユニット１１の中心導体１２に螺合され、連結金具２０の両側がロックリング等のロック部材２１，２２によって固定される。これにより、超電導導体層２が、接続スリーブ１９及びマルチバンドｍを介して中心導体１２に導通接続され、かつ超電導導体層２及びフォーマに一体化された接続スリーブ１９が、連結金具２０を介して、中心導体１２に対して抜け止め方向の引っ張り強度が確保された状態に接続される。そして、そのエポキシユニット１１を含めた接続部分の外周には補強絶縁紙２３が巻回される。このような状態にて、エポキシユニット１１のフランジ１１ａが、冷媒槽１３の縦壁に固定される。尚、図５では、３心一括型の超電導ケーブルにおける１心のみ図示している。
特開２００６−１９６６２８号公報 特開２００７−２８７１０号公報 The configuration of the connecting portion J will be described in detail. The tip of the superconducting conductor layer 2 that has been stripped is connected to one end of the connecting sleeve 19 by solder, and the former of the superconducting cable is compressed and connected in the connecting sleeve 19 to the central conductor. The tensile strength between 12 is ensured. The other end of the connection sleeve 19 is conductively connected to the central conductor 12 of the epoxy unit 11 via a multiband m made of a conductive elastic member. Then, one end of the ring-shaped connecting fitting 20 is screwed to the other end of the connection sleeve 19, the other end of the connecting fitting 20 is screwed to the center conductor 12 of the epoxy unit 11, and both sides of the connecting fitting 20 are locked. It is fixed by lock members 21 and 22 such as rings. As a result, the superconducting conductor layer 2 is conductively connected to the central conductor 12 via the connection sleeve 19 and the multiband m, and the connection sleeve 19 integrated with the superconducting conductor layer 2 and the former is connected via the coupling fitting 20. The center conductor 12 is connected in a state in which the tensile strength in the retaining direction is ensured. The reinforcing insulating paper 23 is wound around the outer periphery of the connection portion including the epoxy unit 11. In such a state, the flange 11 a of the epoxy unit 11 is fixed to the vertical wall of the refrigerant tank 13. FIG. 5 shows only one core in a three-core superconducting cable.
JP 2006-196628 A JP 2007-28710 A

上述のような従来の端末接続構造では、エポキシユニット１１の中心導体１２と接続されている接続スリーブ１９が、その外周に補強絶縁紙２３を巻回する際に、周方向に回動する。即ち、接続スリーブ１９は、連結金具２０を介して、中心導体１２に接続されているが、その接続部の外周に補強絶縁紙２３を巻回する際に、大きな回動トルクが作用するため、周方向につれ回りするものと考えられる。接続スリーブ１９が回動すると、該接続スリーブ１９に接続されている超電導導体層２に捩れを発生させ、これにより、その超電導特性が低下することが懸念される。   In the conventional terminal connection structure as described above, the connection sleeve 19 connected to the central conductor 12 of the epoxy unit 11 rotates in the circumferential direction when the reinforcing insulating paper 23 is wound around the outer periphery thereof. That is, the connection sleeve 19 is connected to the center conductor 12 via the connecting metal fitting 20, but when a reinforcing insulating paper 23 is wound around the outer periphery of the connection portion, a large rotational torque acts, It is thought that it moves around in the circumferential direction. When the connection sleeve 19 rotates, there is a concern that the superconducting conductor layer 2 connected to the connection sleeve 19 is twisted, thereby deteriorating its superconducting characteristics.

本発明は、このような事情に鑑みてなされ、超電導導体層に捩れを発生させないようにした超電導ケーブルの端末接続部構造を提供することを目的とする。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a terminal connection part structure of a superconducting cable that prevents the superconducting conductor layer from being twisted.

本発明の超電導ケーブルの端末接続部構造は、超電導ケーブルの超電導導体層が、接続スリーブ及びリング状の連結金具を介して、常電導側導体に導通接続される超電導ケーブルの端末接続部構造であって、
前記接続スリーブの一端が、超電導導体層に導通接続される一方、前記接続スリーブの他端が、該他端に被嵌接続される前記連結金具を介して、常電導側導体と導通接続され、かつ前記接続スリーブと前記連結金具とには、該接続スリーブと連結金具の相対回動を阻止するためのロック手段が設けられることを特徴とする。 The terminal connection structure of a superconducting cable according to the present invention is a terminal connection structure of a superconducting cable in which the superconducting conductor layer of the superconducting cable is conductively connected to the normal conductor side conductor via a connection sleeve and a ring-shaped coupling fitting. And
One end of the connection sleeve is conductively connected to the superconducting conductor layer, while the other end of the connection sleeve is conductively connected to the normal conductive side conductor via the coupling fitting fitted and connected to the other end. In addition, the connection sleeve and the connection fitting are provided with a locking means for preventing relative rotation of the connection sleeve and the connection fitting.

接続スリーブの一端が、超電導導体層に導通接続される一方、接続スリーブの他端が、該他端に被嵌接続される連結金具を介して、常電導側導体と導通接続される構成において、接続スリーブと連結金具とに設けたロック手段によって、接続スリーブと連結金具の相対回動を阻止することができる。従って、連結金具及び接続スリーブの外周に補強絶縁紙を巻回する際に、連結金具及び接続スリーブが補強絶縁紙から回動方向のトルクを受けても、その回動が阻止される。これにより、超電導導体層が捩れることはなく、捩れに起因する超電導特性の劣化を防止することができる。   In the configuration in which one end of the connection sleeve is conductively connected to the superconducting conductor layer, and the other end of the connection sleeve is conductively connected to the normal conductive side conductor via a coupling fitting fitted and connected to the other end. The locking means provided on the connection sleeve and the coupling metal can prevent the relative rotation of the connection sleeve and the coupling metal. Accordingly, when the reinforcing insulating paper is wound around the outer periphery of the coupling metal and the connection sleeve, even if the coupling metal and the connection sleeve receive torque in the rotational direction from the reinforcing insulation paper, the rotation is prevented. Thereby, the superconducting conductor layer is not twisted, and deterioration of superconducting characteristics due to twisting can be prevented.

前記ロック手段は、前記連結金具に設けられるロック部材と、該ロック部材を係止させるために前記接続スリーブに軸方向に形成されるロック溝と、を備えるようにしてもよい。このようにすれば、接続スリーブのロック溝に、連結金具に設けたロックピン等のロック部材を係止させることによって、連結金具と接続スリーブの相対対応位置のずれを吸収しつつ、連結金具と接続スリーブの相対回動を阻止することができる。   The lock means may include a lock member provided on the coupling metal, and a lock groove formed in an axial direction on the connection sleeve to lock the lock member. In this way, by locking a locking member such as a lock pin provided on the connection fitting in the lock groove of the connection sleeve, while absorbing the shift of the relative corresponding position between the connection fitting and the connection sleeve, The relative rotation of the connection sleeve can be prevented.

前記接続スリーブの一端が、前記超電導導体層に半田接続により導通接続されるようにしてもよい。このようにすれば、例えば超電導導体層に被嵌される接続スリーブに半田注入用の孔をあけておけば、該孔から半田を注入することによって作業性よく接続スリーブと超電導導体層を導通接続することができる。   One end of the connection sleeve may be conductively connected to the superconducting conductor layer by solder connection. In this way, for example, if a hole for solder injection is made in the connection sleeve fitted into the superconducting conductor layer, the connection sleeve and the superconducting conductor layer are connected to each other with good workability by injecting solder from the hole. can do.

前記接続スリーブの他端が、マルチバンドを介して、前記常電導側導体に導通接続されるようにしてもよい。このようにすれば、常電導側導体に、マルチバンドが内装された接続スリーブの他端を、押し込むことによってワンタッチで作業性よく導通接続することができる。   The other end of the connection sleeve may be conductively connected to the normal conducting side conductor via a multiband. If it does in this way, the other end of the connection sleeve with which the multiband was built in the normal conduction side conductor can be pushed in, and can carry out conductive connection by one touch with sufficient workability.

前記連結金具の一端が、前記接続スリーブの他端に螺合される一方、前記連結金具の他端が、前記常電導側導体に螺合されるようにしてもよい。このようにすれば、連結金具を介して、接続スリーブと常電導側導体とを強力な抜け止め方向の引っ張り強度を確保した状態で接続することができる。また、ねじ込み作業によって作業性よく接続することができる。   One end of the connection fitting may be screwed to the other end of the connection sleeve, while the other end of the connection fitting may be screwed to the normal conducting side conductor. If it does in this way, a connection sleeve and a normal conducting side conductor can be connected via a connecting metal fitting in the state where the tensile strength of the direction of a strong retaining direction was secured. Further, it is possible to connect with good workability by screwing work.

前記ロック溝に係止されるロック部材は、前記連結金具に設けたビス孔に螺合されるロックビスであってもよい。このようにすれば、ロックビスを連結金具のビス孔に螺合させて、その先端を接続スリーブに形成したロック溝に係止させることによって、連結金具の回動を安定な状態に阻止することができる。   The lock member locked in the lock groove may be a lock screw that is screwed into a screw hole provided in the connection fitting. By doing this, the lock screw can be screwed into the screw hole of the connecting metal fitting, and the tip of the lock screw can be locked in the lock groove formed in the connecting sleeve, thereby preventing the rotation of the connecting metal piece in a stable state. it can.

前記ビス孔は、前記連結金具の周方向に複数形成されるようにしてもよい。このようにすれば、接続スリーブの他端に螺合される連結金具の締結終了近辺において、ロック溝に適切に対応するビス孔を選択しやすくなるため、ロック状態も安定化する。   A plurality of the screw holes may be formed in the circumferential direction of the connection fitting. By doing so, it becomes easy to select a screw hole corresponding to the lock groove in the vicinity of the end of fastening of the coupling fitting screwed into the other end of the connection sleeve, so that the locked state is also stabilized.

本発明の超電導ケーブルの端末接続部構造は、接続スリーブと連結金具とに設けたロック手段によって、接続スリーブと連結金具の相対回動を阻止することができるため、これらの外周に補強絶縁紙を巻回する際に接続スリーブの周方向への回動を防ぐことができ、超電導導体層の捩れに起因する超電導特性の劣化を防止することができる。   Since the terminal connecting portion structure of the superconducting cable of the present invention can prevent the relative rotation of the connecting sleeve and the connecting bracket by the locking means provided on the connecting sleeve and the connecting bracket, a reinforcing insulating paper is provided on the outer periphery thereof. When winding, the connection sleeve can be prevented from rotating in the circumferential direction, and deterioration of the superconducting characteristics due to twisting of the superconducting conductor layer can be prevented.

以下に、本発明の実施の形態に係る超電導ケーブルの端末接続部構造について図面を参照しつつ詳細に説明する。   Below, the terminal connection part structure of the superconducting cable which concerns on embodiment of this invention is demonstrated in detail, referring drawings.

図１は、超電導ケーブルの端末接続部構造の要部半断面図、図２は接続スリーブの半断面図、図３は連結金具を示す。図１に示す接続スリーブ１９の一端(図示省略)は、図５に示す従来例と同様に、段剥ぎされた超電導導体層の先端に対して半田によって導通接続されており、フォーマは接続スリーブ内に圧縮接続されている。そして、接続スリーブ１９の他端が、導電性弾性部材からなるマルチバンドｍを介して、エポキシユニット(図示省略)の中心導体（常電導側導体）１２に導通接続される。その接続スリーブ１９の他端外周に形成された雄ねじに、リング状の連結金具２０の一端内周の雌ねじが螺合され、連結金具２０の他端内周に形成された雌ねじが、エポキシユニットの中心導体１２の外周に形成された雄ねじに螺合されている。そして、連結金具２０の一端側がリング付きのロックナット２２（図３（ｄ）参照）に螺合されるロックねじ２４によって固定され、他端側が、先尖り状のロックピン２１によって中心導体１２に固定される。   FIG. 1 is a half sectional view of a principal part of a terminal connection structure of a superconducting cable, FIG. 2 is a half sectional view of a connection sleeve, and FIG. As in the conventional example shown in FIG. 5, one end (not shown) of the connection sleeve 19 shown in FIG. 1 is conductively connected by solder to the tip of the stepped superconducting conductor layer. Compressed connection to. Then, the other end of the connection sleeve 19 is conductively connected to the center conductor (normal conducting side conductor) 12 of the epoxy unit (not shown) through a multiband m made of a conductive elastic member. A female screw formed on the inner periphery of one end of the ring-shaped connecting fitting 20 is screwed to a male screw formed on the outer periphery of the other end of the connection sleeve 19, and a female screw formed on the inner periphery of the other end of the connecting fitting 20 is connected to the epoxy unit. It is screwed into a male screw formed on the outer periphery of the center conductor 12. Then, one end side of the connection fitting 20 is fixed by a lock screw 24 screwed into a lock nut 22 with a ring (see FIG. 3D), and the other end side is fixed to the central conductor 12 by a pointed lock pin 21. Fixed.

接続スリーブ１９の他端側には、図２（ａ）（ｂ）に示すように、連結金具２０の回動を阻止するための一対のロック溝２５がケーブル軸方向に形成される一方、連結金具２０の一端側には、図３（ｂ）（ｃ）に示すように、１２対のビス孔２６が形成されており、該ビス孔２６に螺合さるロックビス２７が、ロック溝２５に嵌入係止することによって、連結金具２０と接続スリーブ１９の相対回動が阻止される。このロック溝２５とロックビス２７によって本発明のロック手段が構成される。連結金具２０は、図３（ｂ）に示すように、その内周の略全長にわたって雌ねじ２０ａが形成されており、その他端側には、ロックピン２１を螺合させるためのねじ孔２８が形成されている。その他の点については、図５等に示される従来例と同等に構成されてよい。   On the other end side of the connection sleeve 19, as shown in FIGS. 2 (a) and 2 (b), a pair of lock grooves 25 for preventing the rotation of the connection fitting 20 are formed in the cable axial direction, As shown in FIGS. 3B and 3C, 12 pairs of screw holes 26 are formed on one end side of the metal fitting 20, and lock screws 27 screwed into the screw holes 26 are fitted into the lock grooves 25. By locking, the relative rotation of the coupling fitting 20 and the connection sleeve 19 is prevented. The lock groove 25 and the lock screw 27 constitute the lock means of the present invention. As shown in FIG. 3 (b), the connecting metal fitting 20 is formed with a female screw 20a over substantially the entire inner circumference, and a screw hole 28 for screwing the lock pin 21 is formed on the other end side. Has been. About another point, you may be comprised similarly to the prior art example shown by FIG.

このように構成される超電導ケーブルの端末接続部構造では、中心導体１２に連結金具２０が周方向へ回動不能に固定され、その連結金具２０に接続スリーブ１９が周方向への回動が阻止された状態にロックされる。即ち、連結金具２０に設けたロック部材としてのロックビス２７を、接続スリーブ１９の軸方向に形成されたロック溝２５に係止させることによって、接続スリーブ１９を、周方向への相対回動が規制された状態にロックすることができる。従って、接続スリーブ１９と連結金具２０の外周に補強絶縁紙(図示省略)を巻回する際に、接続スリーブ１９が補強絶縁紙から回動方向のトルクを受けても、その回動が阻止される。これにより、超電導導体層に捩れを発生させることがなくなり超電導特性の劣化を防止することができる。   In the terminal connecting portion structure of the superconducting cable configured as described above, the connecting metal fitting 20 is fixed to the central conductor 12 so as not to rotate in the circumferential direction, and the connecting sleeve 19 is prevented from rotating in the circumferential direction on the connecting metal fitting 20. Locked in the locked state. That is, by locking a lock screw 27 as a lock member provided on the connecting metal fitting 20 in the lock groove 25 formed in the axial direction of the connection sleeve 19, relative rotation in the circumferential direction of the connection sleeve 19 is restricted. Can be locked in the locked state. Therefore, when the reinforcing insulating paper (not shown) is wound around the outer periphery of the connection sleeve 19 and the coupling metal 20, even if the connection sleeve 19 receives torque in the rotational direction from the reinforcing insulating paper, the rotation is prevented. The As a result, no twist is generated in the superconducting conductor layer, and deterioration of the superconducting characteristics can be prevented.

そのロックビス２７によって連結金具２０を回り止め状態に固定するまでの接続作業手順について説明すると、まず、接続スリーブ１９の一端側に、段剥ぎされた超電導導体層の先端を挿入して、該接続スリーブ１９に開けた孔(図示省略)から半田を注入して超電導導体層と接続スリーブ１９を導通接続すると共に、フォーマを接続スリーブ１９内に圧縮接続する。次いで、マルチバンドｍを内装させた接続スリーブ１９の他端を、中心導体１２の接続部１２ａに押し込むワンタッチ動作で圧接状態に導通接続する。この導通接続工程の前に、予め、接続スリーブ１９の一端側に連結金具２０とリング付きのロックナット２２を螺装させておき、導通接続終了後に、連結金具２０を図１の左方向に螺進させ、その他端（図示左側）を中心導体１２の雄ねじ１２ｂに螺合させる。   The connection work procedure until the connection fitting 20 is fixed in the non-rotating state by the lock screw 27 will be described. First, the tip of the stepped superconducting conductor layer is inserted into one end side of the connection sleeve 19, and the connection sleeve Solder is injected from a hole (not shown) formed in 19 to connect the superconducting conductor layer and the connection sleeve 19 in a conductive manner, and the former is compression-connected in the connection sleeve 19. Next, the other end of the connection sleeve 19 in which the multiband m is housed is electrically connected in a pressure contact state by a one-touch operation of pushing into the connection portion 12a of the center conductor 12. Prior to this conductive connection step, the connection fitting 19 and a lock nut 22 with a ring are screwed to one end of the connection sleeve 19 in advance, and the connection fitting 20 is screwed in the left direction in FIG. The other end (the left side in the figure) is screwed into the male screw 12b of the center conductor 12.

その連結金具２０の螺合動作の完了間近辺りで、接続スリーブ１９のロック溝２５の直近に対応する連結金具２０のビス孔２６，２６を選択して、該ビス孔２６，２６にロックビス２７，２７を螺合させてその先端をロック溝２５に嵌入係止させて締結する。次いで、連結金具２０の他端側のねじ孔２８に螺合させてあるロックピン２１を締結して、中心導体１２に対して連結金具２０の他端側を固定すると共に、連結金具２０の一端側に向けて、リング付きのロックナット２２を螺進させてロックねじ２４を締結することによって連結金具２０の一端側を中心導体１２に固定する。これにより、接続作業が終了する。   In the vicinity of the completion of the screwing operation of the connecting fitting 20, the screw holes 26, 26 of the connecting fitting 20 corresponding to the immediate vicinity of the lock groove 25 of the connection sleeve 19 are selected, and the lock holes 27, 26 are inserted into the screw holes 26, 26. 27 is screwed and the tip is fitted and locked in the lock groove 25 to be fastened. Next, the lock pin 21 screwed into the screw hole 28 on the other end side of the connection fitting 20 is fastened to fix the other end side of the connection fitting 20 to the center conductor 12 and one end of the connection fitting 20. The lock nut 22 with a ring is screwed toward the side and the lock screw 24 is fastened to fix one end side of the connecting metal fitting 20 to the central conductor 12. Thereby, the connection work is completed.

以上のように、マルチバンドｍと接続スリーブ１９を介して、超電導導体層と中心導体１２とが導通接続される接続構造において、連結金具２０の一端が、接続スリーブ１９の他端に螺合される一方、連結金具２０の他端が、中心導体１２に螺合されるため、連結金具２０を介して、接続スリーブ１９と中心導体１２とが、強力な抜け止め方向の引っ張り強度が確保された状態で接続される。しかも、回り止め状態にロックされている連結金具２０と、その連結金具２０に対して相対回動が阻止された接続スリーブ１９との接続部を含めたエポキシユニットの外周に補強絶縁紙が巻回される工程中に、接続スリーブ１９に回動トルクが作用しても、超電導導体層に捩れが発生することはなく、超電導特性の劣化を防ぐことができる。尚、本発明は、実施の形態に限定されることなく、発明の要旨を逸脱しない限りにおいて、適宜、必要に応じて改良、変更等は自由である。   As described above, in the connection structure in which the superconducting conductor layer and the central conductor 12 are conductively connected via the multiband m and the connection sleeve 19, one end of the coupling metal 20 is screwed to the other end of the connection sleeve 19. On the other hand, since the other end of the connection fitting 20 is screwed to the center conductor 12, the connection sleeve 19 and the center conductor 12 have a strong tensile strength in the retaining direction via the connection fitting 20. Connected in state. In addition, the reinforcing insulating paper is wound around the outer periphery of the epoxy unit including the connection portion between the connection fitting 20 that is locked in a non-rotating state and the connection sleeve 19 that is prevented from rotating relative to the connection fitting 20. Even if a rotating torque acts on the connection sleeve 19 during the process, the superconducting conductor layer is not twisted, and deterioration of the superconducting characteristics can be prevented. It should be noted that the present invention is not limited to the embodiment, and can be freely improved, changed, etc. as necessary without departing from the gist of the invention.

本発明の超電導ケーブルの端末接続部構造は、接続スリーブの周方向への回動に伴う超電導導体層の捩れに起因する超電導特性の劣化を防止できるので、大電流通電用に好適に適用することができる。   The terminal connection structure of the superconducting cable of the present invention can prevent deterioration of superconducting characteristics due to torsion of the superconducting conductor layer accompanying rotation of the connecting sleeve in the circumferential direction. Can do.

本発明の実施の形態に係る超電導ケーブルの端末接続部構造の要部構成説明図である。It is principal part structure explanatory drawing of the terminal connection part structure of the superconducting cable which concerns on embodiment of this invention. （ａ）は同接続スリーブの側面図、（ｂ）同半断面図である。(A) is a side view of the connection sleeve, and (b) is a half sectional view thereof. 同連結金具とロックナットを示し、（ａ）は（ｂ）のＡ−Ａ線矢視断面図、（ｂ）は同連結金具の半断面側面図、（ｃ）は（ｂ）のＢ−Ｂ線矢視断面図、（ｄ）はロックナットの半断面図である。The connection metal fitting and the lock nut are shown, (a) is a cross-sectional view taken along line AA in (b), (b) is a half cross-sectional side view of the connection metal fitting, and (c) is BB in (b). A cross-sectional view taken along line arrow, (d) is a half cross-sectional view of the lock nut. 従来の３心一括型の超電導ケーブルの断面図である。It is sectional drawing of the conventional 3 core lump type superconducting cable. 従来の超電導ケーブルの端末接続構造の構成説明図である。It is structure explanatory drawing of the terminal connection structure of the conventional superconducting cable.

符号の説明Explanation of symbols

１ フォーマ ２超電導導体層 ３ 絶縁層 ４ 超電導シールド層
５ 冷媒流通路 ６ 内管 ７ 外管 ８ 防食層 ９ ケーブルコア
１０ 超電導ケーブル １１ エポキシユニット １１ａ フランジ
１２ 中心導体 １２ａ 接続部 １２ｂ 雄ねじ １３冷媒槽
１４ 圧縮スリーブ １５ 編組線 １６ 常温側導体（ブッシング）
１７ 電界シールド １８ 冷媒槽 １９ 接続スリーブ ｍ マルチバンド
Ｊ 接続部 ２０ 連結金具 ２０ａ 雌ねじ
２１ ロックピン（ロック部材） ２２ ロックナット（ロック部材）
２３ 補強絶縁紙 ２４ ロックねじ ２５ ロック溝（ロック手段）
２６ ビス孔 ２７ ロックビス（ロック手段） ２８ ねじ孔 DESCRIPTION OF SYMBOLS 1 Former 2 Superconducting conductor layer 3 Insulating layer 4 Superconducting shield layer 5 Refrigerant flow path 6 Inner tube 7 Outer tube 8 Anticorrosion layer 9 Cable core 10 Superconducting cable 11 Epoxy unit 11a Flange 12 Center conductor 12a Connection part 12b Male screw 13 Refrigerant tank 14 Compression Sleeve 15 Braided wire 16 Room temperature side conductor (bushing)
17 Electric Field Shield 18 Refrigerant Tank 19 Connection Sleeve m Multiband J Connection 20 Connection Metal 20a Female Screw 21 Lock Pin (Lock Member) 22 Lock Nut (Lock Member)
23 Reinforced insulating paper 24 Lock screw 25 Lock groove (locking means)
26 Screw hole 27 Lock screw (locking means) 28 Screw hole

Claims (4)

超電導ケーブルの超電導導体層が、接続スリーブ及びリング状の連結金具を介して、常電導側導体に導通接続される超電導ケーブルの端末接続部構造であって、
前記接続スリーブの一端が、超電導導体層に導通接続される一方、前記接続スリーブの他端が、該他端に被嵌接続される前記連結金具を介して、常電導側導体と導通接続され、かつ前記接続スリーブと前記連結金具とには、該接続スリーブと連結金具の相対回動を阻止するためのロック手段が設けられることを特徴とする超電導ケーブルの端末接続部構造。 The superconducting conductor layer of the superconducting cable is connected to the normal conducting side conductor through the connection sleeve and the ring-shaped coupling metal fitting, and is a terminal connection part structure of the superconducting cable,
One end of the connection sleeve is conductively connected to the superconducting conductor layer, while the other end of the connection sleeve is conductively connected to the normal conductive side conductor via the coupling fitting fitted and connected to the other end. The terminal connection part structure for a superconducting cable is characterized in that the connection sleeve and the connection fitting are provided with a locking means for preventing relative rotation of the connection sleeve and the connection fitting. 前記ロック手段は、前記連結金具に設けられるロック部材と、該ロック部材を係止させるために前記接続スリーブに軸方向に形成されるロック溝と、を備えることを特徴とする請求項１に記載の超電導ケーブルの端末接続部構造。   The said locking means is provided with the locking member provided in the said connection metal fitting, and the locking groove formed in the said connection sleeve in the axial direction in order to latch this locking member, The Claim 1 characterized by the above-mentioned. Terminal connection structure of superconducting cable. 前記ロック溝に係止されるロック部材は、前記連結金具に設けたビス孔に螺合されるロックビスであることを特徴とする請求項２に記載の超電導ケーブルの端末接続部構造。   The terminal connection part structure of a superconducting cable according to claim 2, wherein the lock member latched in the lock groove is a lock screw screwed into a screw hole provided in the connection fitting. 前記ビス孔は、前記連結金具の周方向に複数形成されることを特徴とする請求項３に記載の超電導ケーブルの端末接続部構造。   The terminal connection part structure of a superconducting cable according to claim 3, wherein a plurality of the screw holes are formed in a circumferential direction of the connecting metal fitting.
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