成果報告書詳細
管理番号20110000000729
タイトル*平成22年度中間年報 イットリウム系超電導電力機器技術開発 SMES・高電圧超電導ケーブル技術開発 機器用線材製作・開発
公開日2011/7/28
報告書年度2010 - 2010
委託先名古河電気工業株式会社
プロジェクト番号P08016
部署名エネルギー対策推進部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 (1)「超電導電力貯蔵システム(SMES)の研究開発」(3)SMES対応線材安定製造技術開発 (b)SMES対応線材安定製造技術開発 基板に関しては、これまでに開発した算術平均粗さRaが3nm以下となるような高平滑化基板の作製を繰り返して行い、再現性を確認した。中間層では、IBAD-MgO中間層上へのスパッタ法によるキャップ層形成技術の適用をISTECと協力して行い、安定な中間層作製技術を確立した。
英文要約Technological Development of Yttrium-Based Superconducting Power Equipment
FY 2008 - FY2011
FY2010 Annual Report
Furukawa Electric Co., Ltd.
(1) Wire fabrication technology for SMES
We focus on development of the stable fabrication process for thinner buffer layer with collaboration from ISTEC through sputtering. Optimizing buffer layer construction, the wires with Ic over 200A/cm were manufactured repeatedly. As for superconducting layer, an adequate control of key elements in the material gas flow, such as capillary in the vaporizer, enabled the stable operation of CVD process in a long time. In addition, Cu stabilizing method was established since an electroplated method without Ic degradation was improved through many experiences of Cu plating on both IBAD-CVD wires and IBAD-PLD wires.
(2) HTS cable with a high voltage insulation and low dielectric loss
A one meter HTS conductor was fabricated by using thin width cut and Cu plated tapes. Ic at 77K, 74K, and 73K were 6270A, 8150 A, and 9020A, respectively. AC loss at 3kA and 73K achieved 0.124W/m. The tolerance of a YBCO tape against over-current was needed for fault current accident. The wire withstood an over-current test of 1.48 times higher current and a 30 times cyclic test of 1.2 times higher current than the rated over-current of 63kA for 0.6s. Three types of model cables with various insulation thicknesses have been tested, and the design stress of PD free was determined 22kVrms/mm from the test. The model cable fabricated by the stress had good insulation properties, such as PD free of 300kV for 10min, AC withstand voltage of 400kV for 30min, and impulse withstand voltage of 1155kV for 3 shots. In addition, besides dielectric loss of 0.60W/m was achieved, the total loss came from dielectric loss and AC loss was 0.72W/m. A cable joint was designed by two kinds of breakdown stresses that were the stress of radial direction and the stress of surface direction of insulation, which were obtained from a breakdown tests and a numerical simulation. The termination for 275kV cable was fabricated. An AC withstand voltage test of 400kV for 30min and an impulse withstand voltage test of 1155kV, and thermal stability test of 3kA current loading successfully were carried out. Test conditions of the next demonstration of 30m 275kV HTS cable were considered by reference to IEC, JEC, and other standards of power devices and superconducting devices.
(3) Fabricating of YBCO wires with a high strength and a high industrial Je
The high Ic value in magnetic field and high mechanical strength were required for the wire. In order to improve Ic-B properties, we focused an element addition of superconducting layer and thicken the superconducting layer. The high Ic value of 34A/cm under 3T was achieved by thickening GdYBCO film by the CVD process. To thicken the superconducting layer, we optimized a process condition and a buffer layer construction with a new sputtering machine for LMO layer. We confirmed that the high Ic value over 300A/cm was maintained after the wire was subjected to tensile stress equivalent to 1GPa.
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