Effective helical-pitch adjustment in a high-Tc superconducting cable for reducing AC losses

Numerical minimization of AC losses in coaxial coated conductor cables

“…In optimization, the total losses are computed with fast evaluating circuit analysis model [13,14], which has been successfully applied to BSCCO cables [15][16][17] and to a short sample YBCO cable [18]. Here the losses of the individual tapes are computed based on Norris's strip model [19], which have aligned well with the recent measurements from the multilayer cables [9,20], whereas the widely used monoblock model [21] has shown to be too optimistic [9].…”

A Simple and Fast Computation Equivalent Circuit Model to Investigate the Effect of Tape Twisting on the AC Loss of HTS Cables

“…Table V shows the comparison results bewtween the proposed method and other previously published methods. The conducted studies in [21,22] have also aimed to reduce the AC loss by the variation of the twisting angle. The maximum reduction of the AC loss in [21] is about 19.66% while the mechanical limits were also considered.…”

“…However, the current paper uses sensitivity analysis to gain the results and does not AC Loss(W/m) present any iterative method. On the other hand, in [22] the AC loss is reduced by 12 to 14%, but the mechanical limits were neglected.…”

“…COMPARISON BETWEEN THE PROPOSED METHOD AND [21,22] Reference Maximum reduction Mechanical limits Iterative method [21] 19.66% yes no [22] 12-14% no no Proposed 27.99% yes yes IV. CONCLUSION AC loss is investigated in this paper, as a significant parameter in the performance of superconducting cables, with its reduction being the main target.…”

“…Nonetheless, there is a lack of an iterative algorithm in this method to guarantee the certainty of the results. Authors of [22] have also used the twisting angle increase to suppress the AC loss. However, they did not consider any types of mechanical constrain on the HTS tapes.…”