Ac losses in two-layer superconducting power transmission cables consisting of coated conductors with a magnetic substrate

作者：Amemiya Naoyuki^*; Nakahata Masaaki; Fujiwara Noboru; Shiohara Yuh

来源：Superconductor Science and Technology, 2010, 23(1): 014022.

DOI：10.1088/0953-2048/23/1/014022

Electromagnetic field analyses were made in cross-sections of two-layer superconducting power transmission cables consisting of coated conductors to calculate their ac losses, neglecting the spiral arrangement of the coated conductor and assuming each coated conductor was parallel to the cable axis. A substrate of each coated conductor was placed inside when assembling the coated conductors into a cable. Based on the electromagnetic field analyses, ac losses in the superconductor layer in the coated conductor as well as those in the magnetic substrate were calculated. The magnetism of the substrate increases ac losses in the outer-layer coated conductors and in the inner-layer coated conductors in different ways. In outer-layer coated conductors, the hysteretic loss in the magnetic substrate itself dominates their ac losses, because their magnetic substrates are directly exposed to the magnetic field produced by the inner-layer current. In inner-layer coated conductors, ac loss in the superconductor layer increases, because the magnetic substrate of the outer-layer coated conductor attracts magnetic flux to increase the magnetic field component normal to the superconductor layer of the inner-layer coated conductor. The influence of the space between the two layers as well as the width of the coated conductor on the ac loss characteristics is also discussed.

• 出版日期2010-1