AC Loss Assessment of 110 kV/5 kArms HTS Cable for Large Scale Power Application

Abstract

High Temperature Superconducting (HTS) cables offer an alternative solution and better replacement to conventional conductor cables for large scale electricity transmission in grid applications. In this work, the alternating current (AC) power losses of HTS cable which arises due to the occurrence of self-field in the HTS tapes has been estimated. The 5 kArms cable operating at 50 Hz consists of a stainless steel corrugated pipe, HTS conductor, Dielectric material (PPLP), and super-insulation material (PVC). In order to provide the large transmission current at lower AC losses, 2G HTS tape, Yttrium Barium copper Oxide (YBCO) of 4 mm × 0.25 mm is found suitable and considered for the present work. The A.C. losses in the HTS cable are estimated using analytical method (approximated Norris equation) for transport current of 5 kArms at 77 K. Moreover, the effect of various parameters such as varying critical currents, transport current, and frequencies on AC losses is also estimated and presented in the paper. Also, calculated AC losses are validated with the experimentally measured losses available in the literature. The estimated AC losses are found to be in good agreement with the measured published results. The AC losses results will finally help in thermohydraulic modelling of HTS cables to be used in the power grids for efficient and large scale power transmission.