Acceptance test and operation of the Southwire Company 30-m high-temperature superconducting cable cryogenic system.

A 30-m demonstration high-temperature superconducting (HTS) transmission cable system has been installed by Southwire Company in Carrollton, Georgia. The three-phase power transmission system is designed for operation at 1250 A and 12.4-kV alternating current. It supplies all the electricity for three large manufacturing facilities and has been operating under full load for more than 8000 h as of June 2001. The HTS cables are cooled by circulating subcooled liquid nitrogen. Refrigeration of the circulating liquid nitrogen is accomplished using an open subcooler system under vacuum to obtain temperatures below 77 K. The HTS cable cryogenic system is briefly described.discussed. [ABSTRACT FROM AUTHOR]