Development of high electrical resistance persistent current switch for high speed energization system

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Development of high electrical resistance persistent current switch for high speed energization system

Jizo, Y. / Furuta, Y. / Nakashima, H.

Japanese National Railways is now developing a superconducting magnetically-levitated train system. Persistent current switch is incorporated in the super-conducting magnet used in the magnetically-levitated train. In recent years, the switch is required to have higher electrical resistance during its off-state in order to realize the high speed energization/de-energization system of the superconducting magnets. The system aims to decrease evaporation volume of liquid helium during the energization/de-energization of the magnet, by means of energizing the superconducting magnet with high current increasing/decreasing rate. Consequently, it would be possible to decrease the dependence of the on-board magnet system upon the ground cooling system. Through the development of a stable superconductive wire material and a coil structure for the persistent current switch using many small model switches which were produced in order to improve their current carrying capacities, we have succeeded in manufacturing the high electrical resistance persistent current switch whose electrical resistance was 5 ohms. The switch, of cylindrical shape, has a diameter of about 100 mm, a length of about 100 mm.