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Superconducting AC power cables and their accessories for rated voltages from 6 kV to 500 kV. Test methods and requirements Ingestion-build-50790 ISO 7971‑2 is an internationalWhat is this standard about? This document specifies test methods and requirements for high temperature superconducting (HTS) AC power cable systems, cables and their accessories, for fixed installations, for rated voltages from 6 kV (Um = 7,2 kV) up to and including 500 kV (Um = 550 kV). The requirements apply to single core, three core and three phase concentric cables with cold dielectric and their accessories that are not intended for fault