Calculation of Circulating Current Losses in Cable Conductors

Conductors for power cable of large cross section are commonly built up from concentrically stranded bundles, which may be compacted to trapezoidal or sector shape. Concentric stranding does not constitute perfect transposition relative to the non-uniform self-field of the cable. While not normally significant at room temperature, the imperfect transposition can lead to large losses in cryogenic cables.