成果報告書詳細
管理番号20120000000559
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2012/6/9
報告書年度2011 - 2011
委託先名富士電機株式会社
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
(1)超電導変圧器巻線技術開発
(a)超電導変圧器巻線の大電流化技術開発
平成23 年度の実施計画に従い、5mm 幅線材(細線化加工無し)を用いた多層転位並列導体の一次・二次巻線で鉄心付き大電流巻線モデルを設計した。
形態は単相の変流器方式とした。一次巻線は5mm 幅線材を2 並列、二次巻線は平成22年度までに実施された変圧器二次巻線モデル(転位均流線モデル)の成果を反映させ、5mm 幅線材を24 並列にした。その結果、定格容量:1150kVA、定格電圧:6900V/575V、定格電流:167A/2000A、%インピーダンス: 16.7%、総線材長:1.5km/1.3km などとなった。
本設計に基づき巻線の磁界解析を行った。磁界解析結果を図-1 に示す。定格電流において、線材テープ面に垂直方向に印加される最大磁界は0.12T、並行方向は0.26T となった。また、巻線の磁界分布と線材の磁界-交流損失特性を用いて交流損失解析を行い、定格電流において約1.3kW(50Hz)となる見通しとなった。
英文要約Development item: Interim annual report (2011, abstract) on
"Development of yttrium superconductive electric power equipment" (2011 - 2012)

Name of contractor: Fuji Electric Co., Ltd.

[Description]

1. Contents and achieved results of research and development
(1) Development of superconducting transformer winding technology
(a) Development of superconducting transformer winding technology for large current
We designed a large current winding model of the multi-layer dislocation parallel conductor having primary and secondary windings of 5mm-wide wire rods (without thinning process) on an iron core according to the 2011 Implementation Plan.
This model adopts a single-phase current transformer structure by utilizing a primary winding of two parallel rows of 5mm-wide wire rods and a secondary winding of 24 parallel rows of 5mm-wide wire rods reflecting the achieved result of the transformer secondary winding model (dislocation homogeneous current model) that had been used by 2010. As the result, we have obtained a rated capacity of 1150 kVA, rated voltage of 6900V/ 75V, rated current of 167A/2000A, percent impedance of 16.7%, and total wire rod length of 1.5km/1.3km.

(b) Development of technology for reducing the superconducting transformer winding loss
We produced a low-loss winding model having primary and secondary windings of thinned wire rods whose AC loss is one third (100m-class of wire rod length) of that of the crude wire rod on an iron core according to the 2011 Implementation Plan. We implemented AC loss characteristic tests on this model to validate that its AC loss was equal to or less than one third of that of the crude wire rod.
As the result, we found that both the crude and thinned wire rods showed a good conformance with analytic AC loss values. With this, we can see the goal of reducing the AC loss to about one third just as designed.

(2) Development of technology for adding a current limiting function (Trial production of a transformer equipped with a current limiting function of some-hundreds kVA class)
We implemented over-current tests on a transformer equipped with a current limiting function of some-hundreds kVA class produced by 2010 according to the 2011 Implementation Plan to validate the current limiting performance.
In the test environment of subcool liquid nitrogen (66K, atmospheric pressure), we applied a rated voltage of 6.9 kV to the primary winding of the transformer and short-circuited the secondary winding to flow an over-current. We measured the primary current and found 559A in the first wave was limited down to 174A after about 0.25 second. In the other words, this function could limit the current down to 174A that was three times of the rated current 58A (primary). We could successfully produce a predetermined result.

(3) Validation of 2MVA-class superconducting transformer model (Study on designing of a 2MVA-class superconducting transformer model)
We performed detailed design of a 2MVA-class transformer model based on the design study by 2010 according to the 2011 Implementation Plan, and started production of transformer windings.

Contract management number
11500169?0
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