大容量交流超電導ケーブルの冷却特性

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タイトル別名
  • The Cooling Characteristic of Large-Current Capacity AC Superconducting Cable
  • ダイヨウリョウ コウリュウ チョウデンドウ ケーブル ノ レイキャク トクセイ

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Diameter of the superconducting AC composite strand is small, typically 0.1 mm, because the strand must be twisted in a very short pitch, to reduce coupling losses, therefore, current capacity of the single strand is small and in the range of_??_10A. In large scale electric power apparatuses, the conductors must be able to carry large currents and hundreds of these composite strands should be bundled. The composite strand is highly unstable and susceptible to a very small disturbance due to a frictional wire motion, because the main matrix of the wire is highly resistive CuNi.<br>For stable operation of an AC superconducting winding, every strands in the bundle cable should be fixed firmly. An effective technique to fix strands is to impregnate the winding by epoxy. In this case, the AC losses in the winding are to be cooled by heat conduction through the epoxy. Therefore, it is important to estimate temperature rise of the winding to discuss that the epoxy impregnation technique is applicable to the AC superconducting electric power apparatuses. In this paper, mechanism of thermal conduction of the epoxy impregnated winding at 4.2 K region is discussed based on experimented data and the temperature rise of a large scale cable bundled by 7 × 7 × 7 strands calculated considering thermal resistivity at the interface between the epoxy and the strand. The calculated value well agree with the measured value.

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