超電導主変圧器の実用化に向けた交流損失低減と冷却特性向上

摘要

We had designed, fabricated and tested a prototype superconducting traction transformer of a floor-mount type for Shinkansen vehicle by 2004. As a result, we could verify that the transformer satisfied the requirement almost exactly as initially planned. However there have been raised some problems to be solved to put superconducting traction transformer into practical use such that the AC loss of the superconducting tape should be reduced and the capacity of the refrigerator should be larger. In this paper, we present a newly developed narrow type Bi2223 superconducting tape which reduces AC loss to less than 1/2 of that of the transformer fabricated previously in 2004, and a cooling system with 65K, 1kW class pulse tube refrigerator.%鉄道総研では，超電導技術の在来鉄道への応用研究rnとして，鉄道車両用主変圧器の超電導化の可能性についrnて，検討を進めている。2004年度までに，軽量化rnのための最適設計，巻線構造や冷却システムの検討などrnを行い，Bi2223系超電導線を用いた新幹線の架線電圧rn25kVに対応する超電導主変圧器を試作し，その基本特rn性の評価などを行った（以下，「2004年度試作器」と言rnう）。