AC loss of a high- superconducting power-cable conductor

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Abstract
We investigate the AC loss of a high- superconducting power-cable conductor with four layers and interlayer insulation. The electric-circuit model is applied for the calculation of the AC loss of the conductor. The result of a calculation for the AC loss shows that the calculated value is nearly equal to the experimental value; therefore this model explains the electromagnetic property of the conductor well. Moreover the result of a calculation for the current distribution of the conductor indicates that almost all the current passes through the outer layer when the transport current is less than the of the conductor. Finally we calculate the relation between AC loss and the spiral pitch of the high- superconducting wires which make up the conductor. It is found that the AC loss is markedly decreased when the spiral pitch is less than 0.5 m.