成果報告書詳細
管理番号20120000000446
タイトル*平成23年度中間年報 イットリウム系超電導電力機器技術開発
公開日2012/6/13
報告書年度2011 - 2011
委託先名古河電気工業株式会社
プロジェクト番号P08016
部署名省エネルギー部
和文要約1.研究開発の内容及び成果等
[2]「超電導電力ケーブルの研究開発」
(2)高電圧絶縁・低誘電損失ケーブル化技術の開発」
(a)高電圧絶縁・低誘電損失技術の基礎特性評価
超電導ケーブルにおいて、高い送電容量に加えて、低損失、コンパクトがそのメリットである。低損失化は超電導ケーブル開発において重要な技術課題であり、275 kV高電圧ケーブルにおいては、絶縁が厚くなることから導体の発熱量を抑えることが、電気絶縁の信頼性にも関わることとなる。
平成23年度は中間目標までに得られた技術を用いて、275kVケーブルシステム検証用ケーブルと同仕様のケーブルコアを作製した。使用した線材は、中間層をMgOとして、その上にTFA-MODで成膜した線材(MgO線材)とした。中間層が薄いので、機械的な強度が懸念されたが、従来の線材と同等の強度を有していた。この線材をレーザで細線化後に銅メッキし、超電導導体を作製した。交流損失は、今までの成果と同等の結果であり、図1.2-1に示すように、77.3 Kの高温においても、3 kAの交流損失は、0.183 W/mと低損失であることを確認した。この結果は、Icで規格化すると平成22年度に作製した導体と同等である。
275 kVケーブル検証用ケーブルは、ヒートサイクルと課電履歴を受けても、初期特性と同等の誘電特性である0.6 W/mであり、誘電損失と交流損失(超電導導体と超電導シールド)をあわせて、目標の0.8 W/m以下を達成することができる。
英文要約Technological Development of Yttrium-Based Superconducting Power Equipment (FY 2008 - FY2011) Annual Report Furukawa Electric Co., Ltd.

2. R&D on HTS power cable
(2) Development of HTS cable with a high voltage insulation and low dielectric loss
In 2011, we fabricated the conductor having low AC loss of 0.183 W/m at 3 kA despite the high temperature of 77.3 K. This result agreed well with the results of the conductor made in 2010, when the Ic was normalized.
After the test histories of heat cycles and voltage tests, the 275 kV cables kept the same dielectric loss of 0.6 W/m with the initial condition. Therefore, the total losses of AC loss and dielectric loss were less than 0.8 W/m.
When the heat cycle and voltage tests were also applied to the intermediate joint and terminations, no degradation was observed. In addition, an over-current for the intermediate joint was also evaluated. When the over-current of 63 kA for 0.6 sec was applied, the temperature rise and recovery time was controlled less than 20 K and 10 minutes, respectively. After the over-current, no degradation was observed in the electrical resistance of the joints and the Ic.

(5) Verification for demonstration of a 275 kV high voltage cable system
The 30 m length cable was manufactured in 2011. The cable samples from the extra length of 30 m showed that the cable was manufactured well. The Ic of the conductor using 60 3 mm-width wires and the shield using 43 5 mm-width wires were 6440 A and 5580 A, respectively. Average Ic of the conductor and the shield were 358 A/cm and 260 A/cm,which were in good agreement with the sum of Ic of all used superconducting wires.
The 30 m cable demonstration will be conducted in Shenyang Furukawa Cable in China. Its necessary equipments and test layout have been designed, and its construction is in progress. In addition, Furukawa have already started manufacturing the cooling system and terminations. All system will be completed in September 2012.

4. Development of Technology for Wires for Superconducting Power Equipment
(5) Development of technology for fabricating low-cost/high-yield superconducting wires
(a) Development of stable manufacturing technology for fabricating superconducting wires
We investigated the effect of slit. 10 mm-width tapes were slit to 2 mm-width and 70m length tapes with 10 mm-width were slit to 4 mm-width. As a result, we confirmed that slit process had little effect on the Ic of the slit tapes.
We improved each fabrication process in long length tape. As a result, Je of 23 kA/cm2 was confirmed in 50 m length tape.

5. Technical application standardization for superconducting power equipment
(2) Technical standardization for superconducting cable
Concrete plans concerning about the test methods for superconducting cable were discussed at Paris on June 23, 2011. Japan was in charged of type tests, and proposed the test items on the basis of the existing methods in Japan. After several phone discussions, the test items came to a general agreement as follows, a) bending test, b) heating cycle voltage test, c) pressure test d) voltage test, d) lighting impulse voltage test.
Furthermore, routine tests and electrical tests after installation will be examined, and this standard will be completed in June.
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