Some Electrical Characteristics of a DC Superconducting Cable

摘要

A large amount of power (5 GW or more) can be transmitted through a dc superconducting power transmission line (SPTL) which has the highest power density and efficiency of any known transmission line. Although the SPTL has zero resistance to pure dc, it experiences hysteresis and resistive losses under ac and ripple. Under faults, the current may be driven out of the superconductor into the cryostabilizer which causes additional resistive losses. A well-designed SPTL should have minimum steady-state ac losses. It should also be able to recover from a transient fault quickly and reliably. The performance of three dc SPTL's, rated at 2.5 GW, 5 GW, and 7.5 GW are discussed. It is shown that the operating conditions can be successfully met. (ERA citation 02:052830)