Alternating current loss calculation in a high-T_Csuperconducting transmission cable considering the magnetic field distribution

Abstract

We have calculated the alternating current (ac) losses of a 114 MVA high-T C superconducting (HTS) transmission cable using an electric-circuit (EC) model. The HTS cable is fabricated by Tokyo Electric Power Company and Sumitomo Electric Industries, Ltd. The EC model is comprised of a resistive part and an inductive part. The resistive part is obtained by the approximated Norris equation for a HTS tape. The Norris equation indicates hysteresis losses due to self-fields. The inductive part has two components, i.e. inductances related to axial fields and those related to circumferential fields. The layer currents and applied fields of each layer were calculated by the EC model. By using both values, the ac losses of the one-phase HTS cable were obtained by calculation considering the self-field, the axial field and the circumferential field of the HTS tape. The measured ac loss transporting 1 kA rms is 0.7 W m −1 ph −1 , which is equal to the calculation. The distribution of each layer loss resembles in shape the distribution of the circumferential field in each layer, which indicates that the circumferential fields strongly influence the ac losses of the HTS cable.

Development of a high-temperature superconducting bus conductor with large current capacity

“…Serious nonuniformity of current distribution may cause a lack of safety and instability of the bus conductor. Self-and mutual inductances of each layer can be regulated by adjusting the winding angle and spiral pitch in order to ensure current uniform distribution [15]. Taking into account the mechanical characteristics of the HTS tapes and form, the winding spiral angle should be satisfied by equation ( 1)…”

Robust Optimization of Multilayer Conductors of HTS AC Cable Using PSO and Perturbation Analysis

“…where const=10 -4 V/m, and I ci is the critical current of the i-th layer. Fig.3 shows the structure of the single-phase cold dielectric type HTS power cable, which consists of four layers of conductor and two layers of shield used Ag/Bi-2223 tapes [7]. The equivalent circuit of the cold dielectric type HTS cable consisting of m layers of phase conductor and n-m layers of shield is shown in Fig.4.…”

Characteristics of the joint mini-model high temperature superconducting cable

“…The HTS power cable is one of the interesting power applications using HTS tape [1]. HTS power cable is expected to be used for underground power transmission lines supplying electric power for densely populated cities in the near future.…”