An efficiency comparison of superconducting transmission with other high capacity cable systems

The factors influencing the efficiency of power transmission cables are discussed in order to formulate a valid comparison of superconducting cables with other underground cable concepts. The sources of losses are analyzed in light of the most recent available results to compare the percent power losses of superconducting cables, other underground transmission systems, and overhead lines. Under certain conditions, superconducting cables can be extremely efficient, however, it is pointed out that superconducting cables are not necessarily more efficient than conventional transmission systems. In such cases, however, their use may still be justified on the basis of capacity and cost.