Study of Shunt Type SFCL Equipped with Electromagnetic Repulsion Switch for Large Capacity

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  • 電磁反発スイッチを搭載した分流型超電導限流器の大容量化の検討
  • デンジ ハンパツ スイッチ オ トウサイシタ ブンリュウガタ チョウデンドウ ゲンリュウキ ノ ダイヨウリョウカ ノ ケントウ

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Abstract

Using a high temperature superconductor, we constructed and tested a model Superconducting Fault Current Limiter (SFCL). SFCL we proposed has a vacuum interrupter with electromagnetic repulsion mechanism. We set out to construct high voltage class SFCL. We produced the electromagnetic repulsion switch equipped with a 24kV vacuum interrupter (VI). There are problems that opening speed becomes late, because the larger vacuum interrupter needs the heavier weight of its contact. For this reason, the current which flows in a superconductor may be unable to be interrupted within a half cycles of current. In order to solve this problem, it is necessary to change the design of the coil connected in parallel and to strengthen the electromagnetic repulsion force at the time of opening the vacuum interrupter. Then, the design of the coil was changed, and in order to examine whether the problem is solvable, the current limiting test was conduced. We carried out a current limiting test using second generation (2G) HTS wire. The element which is used in this experiment has stainless steel stabilizer both side of the wire. As a result, we succeed in interrupting the current of a superconductor within a half cycle.

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