Development of A 1 kA Class Alternating Current Lead System for a Fault Current Limiter
A thermal design of a 1 kA/6.6 kV class superconducting fault current limiter was discussed, and specifications for a current lead system were obtained. According to these specifications, a 1 kA rms current lead system has been designed and tested. The current lead system was composed of (Bi,Pb)2Sr2Ca2Cu3O10+x tube leads (used in 77–4 K range), Cu leads (used in 300–77 K), a liquid helium vessel and a 77 K refrigerator, which cools the thermal anchor of the current leads and a radiation shield. The current lead system was placed in a vacuum vessel and cooled by thermal conduction. This lead system successfully transported 1 kA rms alternating current for 3 hours under steady-state temperature distribution. The total heat load to 4 K for 1 kA rms current was 3.5 W. We have a prospect of developing a small cooling system for a 1 kA class fault current limiter.
KeywordsTotal Heat Helium Refrigeration CuNi
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