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Southwire Company has installed, tested and is operating the first real-world application of a high-temperature superconducting cable system at its headquarters in Carrollton, Ga. The cable is powering three Southwire manufacturing plants, marking the first time a company has successfully made the difficult transition from laboratory to practical field application of an HTS cable. The cables are rated at 12.4-kV, 1250-A, 60 Hz and are cooled with pressurized liquid nitrogen at temperatures from 70-80 K. Before placing the cables into service, extensive off-line electrical testing was performed including voltage withstand, measurement of dc critical current, extended load current testing, rated voltage testing and partial discharge measurement. The cables were energized on Jan. 5, 2000 for on-line testing and operation, and by the end of Aug. 2000, had provided 100% of the customer load for 2164 hours.

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