200805837 九、發明說明： 【發明所屬之技術領域】 本發明係關於超導電纜之連接部者。 【先前技術】 超導電纜方面，已提出一種記載於第2圖之超導電纜。 此超導電纜1 0 0係將捻合3條電纜芯1 0所形成之多芯電纜 芯收容於隔熱管2 0內之構成。 各電纜芯10係自中心起依序具有型芯11、超導導體12、 ® 絕緣層1 3、外部導體層14及保護層1 5。通常，絕緣層丄3 係經由捲繞絕緣紙所構成。超導導體1 2及外部導體層！ 4 均是由超導線材所形成。外部導體層1 4係用作爲例如將超 導導體1 2作爲電流往路時的電流歸路。 另一方面，隔熱管20係於內管21與外管22所構成之二 重管之間配置有隔熱材（未圖示），且將二重管內抽成真空 的構成。在隔熱管2 0之外側形成有防蝕層2 3。在此種電纜 中，通常，由內管21與各電纜芯10所包圍之空間係構成 ®冷媒的流路。 在使用此種超導電纜來構築涵蓋長距離之線路的情況， 在線路途中需要有用以連接自不同電纜所引出之電纜芯的 連接部。在作爲該連接部之構成上，例如有專利文獻1所 記載者。該連接部係將電纜芯端部剝除一段以使超導導體 露出，由連接套管來連接各芯之超導導體，並於該些外周 上形成補強絕緣層，以被覆露出之超導導體、連接套管、 絕緣層之端部。 200805837 在專利文獻1中，此補強絕緣層係在超導導體、連接套 管、絕緣層之外周捲繞補強絕緣紙所形成。補強絕緣紙係 與形成電纜芯之絕緣層的絕緣紙相同，使用牛皮紙、或將 聚丙烯薄膜與牛皮紙積層所形成之複合紙（PPLP :住友電氣 工業股份有限公司之註冊商標）。 專利文獻1:日本特開2005-011669號公報 【發明內容】 然而，在超導電纜中，在舖設電纜或由輸送滾筒進行捲 ® 繞時，因爲電纜芯被彎曲，所以在形成電纜芯之絕緣層時， 略微鬆弛地捲繞絕緣紙。 另外，在電纜芯絕緣層上捲繞補強絕緣紙而形成連接部 之補強絕緣層的情況，此補強絕緣紙係處於乾燥之狀態， 所以係在電纜芯絕緣層上捲繞摩擦阻力大之乾性補強絕緣 紙。 因此，在電纜芯絕緣層上形成補強絕緣層的情況，在鬆 驰地捲繞之絕緣紙上捲繞摩擦阻力大之補強絕緣紙。其結 ^ 果，由於補強絕緣紙之捲繞，對電纜芯施加大的鎖緊扭矩， 而有在補強絕緣層正下方之電纜芯絕緣紙上產生捲曲皺折 之虞。 又，當電纜略有彎曲時，使得補強絕緣紙難以順著電纜 芯絕緣層上，所以使得在電纜芯絕緣層上產生捲曲皺折之 可能性增大。例如，在將三芯電纜鬆捻而在每一單相上連 接電纜芯之情況，因爲難以筆直地引出各電纜芯，所以會 有在電纜芯上出現略微彎曲部分的情況。當在如此般電纜 200805837 芯略微彎曲的狀態下連接電纜芯而形成補強絕緣層時，會 使在電纜芯絕緣層上產生捲曲皺折之可能性更爲增大。 於是，當如此般產生有捲曲皺折時，其最壞之情況恐有 引起絕緣破壞等之重大事態之虞。 本發明係鑒於上述情況而提出者，其目的在提供一種超 導電纜之連接部，其即使由補強絕緣紙形成超導電纜之連 接部的補強絕緣層時，仍可防止在形成電纜芯之絕緣層的 絕緣紙上產生捲曲皺折。 ⑩(解決課題之手段） 本發明之超導電纜之連接部，係具有超導導體；接續超 導導體與連接對象之導體連接部；以使超導導體之一部分 露出的方式加以被覆之絕緣層；及至少被覆導體連接部、 露出之超導導體及絕緣層之端部的補強絕緣層之超導電纜 之連接部，其特徵爲：該補強絕緣層係由含浸有絕緣潤滑 油之補強絕緣紙捲繞而形成。 超導電纜之構成並無特別指定。其具代表性者可列舉由 w 電纜芯及收容有電纜芯之隔熱管所構成的超導電纜。其 中，電纜芯之基本構成係具有型芯、超導導體及絕緣層。 本發明之超導電纜之連接部，係形成於超導電纜之端 部。又，本發明之超導電纜之連接部的構成，當然可應用 於中間連接部，亦可應用於終端連接部。 另外，連接部係先將電纜芯之端部剝除一段，以使超導 導體及絕緣層局部露出，並由導體連接部來連接其超導導 體。 200805837 在中間連接部之情況，通常是在使一方之電纜芯的端部 與另一方之電纜芯的端部對接的狀態下，介由導體連接部 來連接該些超導導體。而在終端連接部之情況，通常’超 導電纜之超導導體是介由導體連接部而與銅等之電流導線 連接。 導體連接部係使用，例如至少兩端部成爲空心部的導電 構件，將超導導體嵌入空心部內並加以錫焊、或是將超導 導體與電流導線嵌入空心部內並加以壓縮連接，或是由多 ® 面接觸型連接器加以連接所構成。 其次，在由導體連接部將露出之超導導體連接後，以至 少被覆導體連接部、露出之超導導體及絕緣層之端部的方 式，將含浸有絕緣潤滑油之補強絕緣紙捲繞於該些外周而 形成補強絕緣層。 此時，補強絕緣紙係在捲繞於電纜芯的端部之前預先含 浸絕緣潤滑油。將補強絕緣紙捲繞於電覽芯的端部，而由 補強絕緣層至少被覆導體連接部、自導體連接部露出之超 ® 導導體、及至絕緣層之端部（例如，形成爲錐形之鉛筆狀下 方部）爲止的範圍。 補強絕緣紙可使用牛皮紙、及將牛皮紙與塑膠薄膜積層 所構成之複合紙之至少一種。具體而言，.可列舉僅由牛皮 紙形成補強絕緣層的情況、僅由複合紙形成補強絕緣層的 情況、將牛皮紙與複合紙組合而形成補強絕緣層的情況。 典型之複合紙係可使用將聚丙烯薄膜與牛皮紙積層所形成 者（PPLP :住友電氣工業股份有限公司之註冊商標）。 200805837 亦可由絕緣紙形成被覆超導導體之該絕緣層，而該絕緣 紙可使用含浸有絕緣潤滑油之紙。本發明之絕緣潤滑油係 指在含浸於絕緣補強紙時，可獲得與乾性補強絕緣紙相比 其摩擦阻力變小的潤滑性，且具有絕緣性的油。絕緣潤滑 油係以在常溫下容易以低黏度進行含浸者爲較佳。絕緣潤 滑油可列舉合成油或OF電纜油。較佳爲例如以DDB (十二 烷基苯）、烷基苯、礦油、聚丁烯油、矽油等之電絕緣性能 良好的油爲主體之油或該些的混合油。 如此，因爲捲繞含浸油之補強絕緣紙以形成補強絕緣 層，所以可藉由油的潤滑而以低阻力將補強絕緣紙捲繞於 電纜芯絕緣層之外周，不會對電纜芯施加大的扭矩。 爲了更進一步減小施加於電纜芯之扭矩，形成電纜芯絕 緣層之絕緣紙，亦可使用含浸絕緣潤滑油之絕緣紙。 另外，本發明之超導電纜之連接部，亦可用作爲直流輸 配電用之超導電纜線路、或交流輸配電用之超導電纜線路。 (發明效果） 根據本發明之超導電纜之連接部時，因爲在形成連接部 之補強絕緣層之補強絕緣紙上，使用含浸有絕緣潤滑油之 補強絕緣紙，所以在形成補強絕緣層時，補強絕緣紙之潤 滑性變得良好，可減低施加於電纜芯上之鎖緊扭矩。其結 果，可抑制對電絕緣性有害之形成於電纜芯絕緣層之絕緣 紙上皺折的產生。 【實施方式】 以下，將說明本發明之實施形態。又，對在以下之圖面 200805837 中相同或相當之部分，賦予相同之元件符號，並不再重複 進行說明。圖面之尺寸比例，係用於說明而不一定爲一致。 在此，超導電纜之連接部，係以直流超導電纜之中間連接 部爲例，說明以下之各實施形態。 [連接部之構成] 該中間連接部係將直流超導電纜之一對電纜芯對接而連 接各電纜芯的構造。 各電纜芯係於第1圖中被簡化而顯示，但與第2圖之芯 同樣地，自中心起依序具有型芯、超導導體1 2、絕緣層1 3、 外部導體層及保護層。又，在第1圖中，省略了外部導體 層及保護層。至於型芯係使用將絕緣後之素材線所形成之 複數條銅素材線捻合而成之捻合線。至於超導導體1 2及外 部導體層係使用Bi2223系Ag-Mn包覆帶狀線材。將該帶狀 線材螺旋狀地多層捲繞於型芯上以構成超導導體1 2，並多 層地捲繞於絕緣層1 3上以構成外部導體層。另外，絕緣層 13係捲繞PPLP(註冊商標）所構成。保護層係捲繞絕緣紙而 形成。 將此種電纜芯之端部剝除一段，以使超導導體1 2、絕緣 層1 3呈階梯狀露出。實際上另一層亦被呈階梯狀露出'但 爲了便於說明，顯示使超導導體1 2、絕緣層1 3露出之狀 態。此時，在絕緣層1 3之端部形成越是前端側、直徑越小 之錐形之鉛筆狀下方部1 3 A。 · 在此，各芯之端部係介由連接套管而將型芯彼此壓縮連 接（未圖示），將該外周之超導導體12***導體連接套管（導 -10- 200805837 體連接部）3 2內，並進行錫焊連接。導體連接套管3 2之外 徑係形成爲兩端側小而中央部大，其中央部之外徑係構成 爲與絕緣層之外徑實質上相等。 以被覆此種導體連接套管32、露出之使超導導體1 2、絕 緣層13之端部的範圍的方式形成補強絕緣層31。該補強絕 緣層3 1係將預先含浸由合成油組成之絕緣潤滑油者捲繞 於將牛皮紙積層於聚丙烯上所形成之複合紙帶（PPLP :註冊 商標）上而構成。 更具體而言，將絕緣層之包含鉛筆狀下方部丨3 A的端 部、露出之超導導體12、及導體連接套管32之外周。此時 加以被覆，補強絕緣層3 1之兩端部係形成爲越是遠離導體 連接套管3 2、其外徑越小的錐形。該補強絕緣層3 1之兩端 部係相當於在其上由半導體材料所形成之電場緩和層（未 圖示）之豎立部。 本實施形態之超導電纜之連接部，係捲繞預先含浸絕緣 潤滑油之補強絕緣紙以形成連接部之補強絕緣層，所以補 強絕緣紙之潤滑性良好，可減低對電纜芯施加之鎖緊扭 矩。其結果，可抑制形成電纜芯絕緣層之絕緣紙的皺折的 產生，可防止絕緣破壞。 又’連接於本發明之終觸構造的超導電續，可爲具有一^ 條超導導體之電纜芯的單相超導電纜，亦可爲具有複數條 相同電纜芯的多相超導電纜。多相超導電纜例如可列舉捻 合3條電纜芯而被收容於隔熱管內之三芯合一型之三相超 導電纜。亦可爲公知之單相超導電纜、多相超導電纜。 -11- 200805837 又’當更將已絕緣潤滑油之補強絕緣紙含浸於液態氮等 之冷媒時，尤其是在連接部之組裝時，藉由該冷媒來冷卻 連接部，以凍結補強絕緣紙中的絕緣潤滑油，可抑制油自 電纜中流出。 本次所揭示之實施形態，均係例示而不應認爲係限制 者。本發明之範圍不是由上述實施形態而是由申請專利範 圍所揭示，其包括凡與申請專利範圍相等之意味及其範圍 內的所有變更。 • [產業上之可利用性] 本發明之超導電纜之連接部可利用於直流輸配電用之超 導電纜線路、或交流輸配電用之超導電纜線路° 【圖式簡單說明】 第1圖爲顯示本發明之實施形態之連接部的示意部分縱 剖視圖。 第2圖爲超導電纜之橫剖視圖。 ^【主要元件符號說明】 100超導電纜 1 0電纜芯 1 1型芯 12超導導體 1 3絕緣層 13A鉛筆狀下方部 1 4外部導體層200805837 IX. Description of the Invention: [Technical Field to Which the Invention Is Ascribed] The present invention relates to a connection portion of a superconducting cable. [Prior Art] In the case of a superconducting cable, a superconducting cable described in Fig. 2 has been proposed. This superconducting cable 100 is configured to accommodate a multi-core cable core formed by three cable cores 10 in a heat insulating tube 20. Each of the cable cores 10 has a core 11, a superconducting conductor 12, an insulating layer 13, an outer conductor layer 14, and a protective layer 15 in this order from the center. Usually, the insulating layer 3 is formed by winding insulating paper. Superconducting conductor 12 and outer conductor layer! 4 are all formed by superconducting wires. The outer conductor layer 14 is used as, for example, a current when the superconducting conductor 12 is used as a current path. On the other hand, the heat insulating tube 20 is provided with a heat insulating material (not shown) between the inner tube 21 and the double tube formed by the outer tube 22, and the inside of the double tube is evacuated. An anti-corrosion layer 23 is formed on the outer side of the heat insulating tube 20. In such a cable, generally, the space surrounded by the inner tube 21 and each of the cable cores 10 constitutes a flow path of the refrigerant. In the case of using such a superconducting cable to construct a line covering a long distance, a connection portion for connecting a cable core drawn from a different cable is required in the middle of the line. For example, the configuration of the connecting portion is as described in Patent Document 1. The connecting portion strips the end of the cable core to expose the superconducting conductor, connects the superconducting conductors of the cores by connecting sleeves, and forms a reinforcing insulating layer on the outer circumferences to cover the exposed superconducting conductors. , connecting the sleeve, the end of the insulation layer. 200805837 In Patent Document 1, the reinforcing insulating layer is formed by winding a reinforcing insulating paper around the superconducting conductor, the connecting sleeve, and the insulating layer. The reinforced insulating paper is the same as the insulating paper forming the insulating layer of the cable core, and is formed of kraft paper or a composite paper formed by laminating a polypropylene film and a kraft paper (PPLP: registered trademark of Sumitomo Electric Industries Co., Ltd.). Patent Document 1: Japanese Laid-Open Patent Publication No. 2005-011669. SUMMARY OF THE INVENTION However, in a superconducting cable, when a cable is laid or wound by a transport roller, since the cable core is bent, the insulation of the cable core is formed. In the case of the layer, the insulating paper is wound slightly loosely. In addition, when the reinforcing insulating paper is wound around the cable core insulating layer to form a reinforcing insulating layer of the connecting portion, the reinforcing insulating paper is in a dry state, so that the winding core has a large frictional resistance on the insulating layer of the cable core. Insulating paper. Therefore, in the case where the reinforcing insulating layer is formed on the cable core insulating layer, the reinforcing insulating paper having a large frictional resistance is wound on the loosely wound insulating paper. As a result, due to the winding of the reinforcing insulating paper, a large locking torque is applied to the cable core, and a wrinkle wrinkle is generated on the cable core insulating paper directly under the reinforcing insulating layer. Further, when the cable is slightly bent, it is difficult for the reinforcing insulating paper to follow the cable core insulating layer, so that the possibility of occurrence of curl wrinkles on the cable core insulating layer is increased. For example, in the case where the three-core cable is loosened and the cable core is connected on each single phase, since it is difficult to straighten out the respective cable cores, there may be a case where a slightly curved portion appears on the cable core. When the cable core is connected to form a reinforcing insulating layer in such a state that the cable is slightly bent, the possibility of occurrence of curl wrinkles on the cable core insulating layer is further increased. Therefore, when there is a curl wrinkle in this way, the worst case may cause a major event such as insulation breakdown. The present invention has been made in view of the above circumstances, and an object thereof is to provide a connecting portion of a superconducting cable which can prevent insulation of a cable core from being formed even when a reinforcing insulating layer of a connecting portion of a superconducting cable is formed by reinforcing insulating paper. Curly wrinkles are produced on the insulating paper of the layer. (Means for Solving the Problem) The connection portion of the superconducting cable of the present invention has a superconducting conductor; a conductor connecting portion connecting the superconducting conductor and the connection target; and an insulating layer coated to expose a part of the superconducting conductor And a connecting portion of the superconducting cable covering at least the conductor connecting portion, the exposed superconducting conductor and the reinforcing insulating layer at the end of the insulating layer, wherein the reinforcing insulating layer is made of reinforcing insulating paper impregnated with insulating lubricating oil Formed by winding. The composition of the superconducting cable is not specifically specified. Typical examples thereof include a superconducting cable composed of a w cable core and a heat insulating tube in which a cable core is housed. Among them, the basic structure of the cable core has a core, a superconducting conductor and an insulating layer. The connecting portion of the superconducting cable of the present invention is formed at the end of the superconducting cable. Further, the configuration of the connecting portion of the superconducting cable of the present invention can of course be applied to the intermediate connecting portion or to the terminal connecting portion. Further, the connecting portion first peels the end portion of the cable core to partially expose the superconducting conductor and the insulating layer, and connects the superconducting conductor by the conductor connecting portion. 200805837 In the case of the intermediate connection portion, the superconducting conductors are usually connected via the conductor connecting portion in a state in which the end of one of the cable cores is butted against the end of the other cable core. In the case of the terminal connection portion, the superconducting conductor of the superconducting cable is usually connected to a current conductor such as copper via a conductor connection portion. The conductor connecting portion is used, for example, a conductive member having at least two end portions as a hollow portion, the superconducting conductor is embedded in the hollow portion and soldered, or the superconducting conductor and the current wire are embedded in the hollow portion and compressedly connected, or Multi-face contact connectors are connected. Next, after the exposed superconducting conductor is connected by the conductor connecting portion, the reinforcing insulating paper impregnated with the insulating lubricating oil is wound around at least the conductor connecting portion, the exposed superconducting conductor, and the end portion of the insulating layer. These peripheralities form a reinforcing insulating layer. At this time, the reinforcing insulating paper is previously impregnated with the insulating lubricating oil before being wound around the end of the cable core. The reinforcing insulating paper is wound around the end of the electric core, and the reinforcing insulating layer covers at least the conductor connecting portion, the super-conducting conductor exposed from the conductor connecting portion, and the end portion to the insulating layer (for example, formed into a tapered shape) The range up to the lower part of the pencil shape. The reinforcing insulating paper may be at least one of kraft paper and a composite paper composed of a layer of kraft paper and a plastic film. Specifically, a case where the reinforcing insulating layer is formed only of kraft paper, a case where the reinforcing insulating layer is formed only of the composite paper, and a case where the kraft paper and the composite paper are combined to form a reinforcing insulating layer may be mentioned. A typical composite paper system can be formed by laminating a polypropylene film and a kraft paper (PPLP: registered trademark of Sumitomo Electric Industries Co., Ltd.). 200805837 The insulating layer covering the superconducting conductor may also be formed of insulating paper, and the insulating paper may be paper impregnated with insulating lubricating oil. The insulating lubricating oil of the present invention is an oil having insulating properties which is less than that of the dry reinforcing insulating paper when it is impregnated with the insulating reinforcing paper, and which has insulating properties. Insulating Lubricating Oil is preferred because it is easy to impregnate at a low temperature at normal temperature. Examples of the insulating lubricating oil include synthetic oil or OF cable oil. For example, an oil mainly composed of an oil having good electrical insulating properties such as DDB (dodecylbenzene), alkylbenzene, mineral oil, polybutene oil, eucalyptus oil or the like or a mixed oil thereof is preferable. In this way, since the reinforcing insulating paper containing the oil is wound to form the reinforcing insulating layer, the reinforcing insulating paper can be wound around the outer periphery of the cable core insulating layer with low resistance by lubrication of the oil, and the cable core is not applied to the cable core. Torque. In order to further reduce the torque applied to the cable core, the insulating paper forming the insulating layer of the cable core may be an insulating paper impregnated with an insulating lubricating oil. Further, the connection portion of the superconducting cable of the present invention can also be used as a superconducting cable line for direct current transmission and distribution or a superconducting cable line for alternating current transmission and distribution. (Effect of the Invention) According to the connection portion of the superconducting cable of the present invention, since the reinforcing insulating paper impregnated with the insulating lubricating oil is used on the reinforcing insulating paper forming the reinforcing insulating layer of the connecting portion, reinforcement is formed when the reinforcing insulating layer is formed. The lubricity of the insulating paper becomes good, and the tightening torque applied to the cable core can be reduced. As a result, generation of wrinkles on the insulating paper formed on the insulating layer of the cable core, which is harmful to electrical insulation, can be suppressed. [Embodiment] Hereinafter, embodiments of the present invention will be described. In the following, the same or equivalent components will be denoted by the same reference numerals, and the description will not be repeated. The size ratio of the drawings is for explanation and not necessarily consistent. Here, the connection portion of the superconducting cable is exemplified by the intermediate connection portion of the direct current superconducting cable, and the following embodiments will be described. [Configuration of Connection Portion] The intermediate connection portion is a structure in which one of the DC superconducting cables is butted to the cable core to connect the respective cable cores. Each of the cable cores is shown simplified in Fig. 1, but similarly to the core of Fig. 2, the core, the superconducting conductor 1, the insulating layer 13, the outer conductor layer, and the protective layer are sequentially provided from the center. . Further, in Fig. 1, the outer conductor layer and the protective layer are omitted. As for the core, a twisted wire formed by twisting a plurality of copper material wires formed by the insulated material wires is used. As for the superconducting conductor 12 and the outer conductor layer, a strip wire of Bi2223-based Ag-Mn was used. The strip-shaped wire is spirally wound on a core to form a superconducting conductor 12, and is wound in a plurality of layers on the insulating layer 13 to constitute an outer conductor layer. Further, the insulating layer 13 is formed by winding PPLP (registered trademark). The protective layer is formed by winding an insulating paper. The end portion of the cable core is peeled off for a period so that the superconducting conductor 1 2 and the insulating layer 13 are exposed in a stepwise manner. Actually, the other layer is also exposed in a stepped manner. However, for convenience of explanation, the state in which the superconducting conductor 1 2 and the insulating layer 13 are exposed is shown. At this time, a pencil-like lower portion 1 3 A having a tapered shape as the tip end side is formed at the end portion of the insulating layer 13 is formed. · Here, the ends of the cores are connected to each other via a connecting sleeve (not shown), and the outer superconducting conductor 12 is inserted into the conductor connecting sleeve (guide-10-200805837 body connection portion) ) 3 2 and solder joints. The outer diameter of the conductor connecting sleeve 3 2 is formed such that both end sides are small and the central portion is large, and the outer diameter of the central portion is formed to be substantially equal to the outer diameter of the insulating layer. The reinforcing insulating layer 31 is formed so as to cover the conductor connecting sleeve 32 and expose the end portions of the superconducting conductor 2 and the insulating layer 13. The reinforcing insulating layer 31 is formed by winding an insulating lubricating oil composed of a synthetic oil in advance on a composite paper tape (PPLP: registered trademark) formed by laminating kraft paper on polypropylene. More specifically, the insulating layer includes the end portion of the pencil-shaped lower portion 丨3 A, the exposed superconducting conductor 12, and the outer circumference of the conductor connecting sleeve 32. At this time, the both ends of the reinforcing insulating layer 31 are formed so as to be apart from the conductor connecting sleeve 3, and the outer diameter thereof is tapered. Both ends of the reinforcing insulating layer 31 correspond to an erected portion of an electric field relaxing layer (not shown) formed of a semiconductor material thereon. In the connecting portion of the superconducting cable of the present embodiment, the reinforcing insulating paper impregnated with the insulating lubricating oil is wound to form the reinforcing insulating layer of the connecting portion, so that the reinforcing insulating paper has good lubricity and can reduce the locking applied to the cable core. Torque. As a result, generation of wrinkles of the insulating paper forming the cable core insulating layer can be suppressed, and insulation breakdown can be prevented. Further, the superconducting cable connected to the final touch structure of the present invention may be a single-phase superconducting cable having a cable core of one superconducting conductor, or a multi-phase superconducting cable having a plurality of identical cable cores. The multiphase superconducting cable includes, for example, a three-core type three-phase superconducting cable that is housed in a heat insulating tube by combining three cable cores. It can also be a well-known single-phase superconducting cable or a multi-phase superconducting cable. -11- 200805837 'When the reinforcing insulating paper of the insulating lubricating oil is further immersed in a refrigerant such as liquid nitrogen, especially when the connecting portion is assembled, the connecting portion is cooled by the refrigerant to freeze the reinforcing insulating paper. Insulating lubricant that inhibits oil from flowing out of the cable. The embodiments disclosed herein are illustrative and should not be considered as limiting. The scope of the present invention is not intended to be limited by the scope of the appended claims, but rather • [Industrial Applicability] The connection part of the superconducting cable of the present invention can be used for a superconducting cable line for direct current transmission and distribution or a superconducting cable line for alternating current transmission and distribution. [Simplified illustration] BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a schematic portion of a connecting portion according to an embodiment of the present invention. Figure 2 is a cross-sectional view of the superconducting cable. ^[Main component symbol description] 100 superconducting cable 1 0 cable core 1 1 core 12 superconducting conductor 1 3 insulating layer 13A pencil-shaped lower part 1 4 outer conductor layer
200805837 15 保 護 層 20 隔 熱 管 21 內 管 22 外 管 23 防 鈾 層 30 中 間 連 接 部 3 1 補 強 絕 緣 層 32 導 體 連 接 套管（導體連接部）200805837 15 Protective layer 20 Heat pipe 21 Inner tube 22 Outer tube 23 Anti-uranium layer 30 Middle connection 3 1 Reinforced insulation layer 32 Conductor connection Sleeve (conductor connection)
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