Field winding model test of 70 MW class superconducting generator

A national project for development of a superconducting generator has been continuing since 1988 in Japan. In this project, the authors have been developing a superconducting field winding. An aluminium stabilized double standard superconducting cable has been developed for the winding. In the rotor, the centrifugal force field is 5000 G, and consequently liquid helium has a cooling ability ten times larger than that in the 1-G gravitational field. Therefore, a cryostable winding design can be used. A field winding model having 40% of the 70-MW-class generator field winding was tested in a nonrotated cryostat. The specification and structure of the cable and the test results are outlined. >