Investigation On Electromagnetic Characteristics Of Isotropic Strand Made From Coated Conductor

Over the last few years, significant progress, has been made on practical High Temperature Superconductors (HTS), especially ReBCO Coated Conductor (CC) so called the second generation (2G) HTS wire, its critical current density continually increases and anisotropy is also improved. International Companies have achieved the ability to routinely manufacture kilometer-class high performing 2G HTS wire. Meanwhile, the researches on high-capacity superconductors used ReBCO CC have been made certain progress. Several of high-capacity conductors, such as Roebel Cable, TSTC and CORC, have been put forward for power application.In this paper, a high temperature superconducting (HTS) strand with isotropic structure made from ReBCO CC was proposed. Tapes in the strand are stacked with symmetric structure and sheathed outside by superiorly thermal and electrical conventional conductor. The mechanical properties and electromagnetic stability were enhanced by the application of mental capsule technology. Five designs of isotropic HTS strand are put forward, and their structural feature and potential application are introduced. One design was selected for fabricating sample of isotropic HTS strand. The fabricating process is described in detail.This paper focuses on the electromagnetic characteristics of isotropic HTS strand. Firstly, a proportional simulation model is build according to the sample of isotropic HTS strand. The magnetic field distribution on cross-section in self-filed is obtained by using Ansoft Maxwell software. A method based on the distribution of magnetic filed for calculating the critical current of isotropic HTS strand is suggested. Simultaneously, the critical current in self-field at liquid nitrogen temperature was tested. The experimental result was in good agreement with the calculated one, which indicates the reasonability of the calculation. Based on calculating method of critical current in self field, the critical currents of isotropic HTS strand in external field are simulated. Magnetic field dependence of normalized critical current on its orientation as well as angle dependence of normalized critical current on magnetic field are found, respectively. In addition, the corresponding experiments were performed and a good agreement between measurement and simulation is achieved. Finally, the analytical method of AC loss is described and the AC loss measurement platform is designed and set up. The AC loss of isotropic HTS strand was tested at different frequency.