Abstract
Finite element method (FEM) for both linear and nonlinear cases is widely used for solving time-dependent problems related to the geometrical configuration of electrical HTS devices and AC losses. This paper presents our FEM models used in the development of the HTS cables. Transient 3D FEM models have been developed for optimization of both coaxial and triaxial 2G HTS cables. In these models, only linear magnetic materials are considered. The transient 2D FEM model was developed and used for the calculation of AC losses in the cables made from 2G HTS tapes. The 2G HTS layer of the tape has strong nonlinearity between resistivity and current density and requires careful modeling. Also, it is important to determine the parameters in an empirical expression that describes the critical current density of the 2G HTS layer dependence from the vector magnetic field and its non-uniformity across the tape width.
Highlights
Several software based on the finite-element method (FEM) have been used to model the electromagnetic fields of electrical HTS devices
The model allows to consider the spiral structure of a cable core and shielding layers to obtain current and detailed magnetic field
The AC losses in a HTS device consist of: hysteresis losses caused by the penetration of the magnetic flux in the superconducting material, hysteresis losses in magnetic materials, and eddy current losses in the normal metal parts of the HTS device
Summary
Several software based on the finite-element method (FEM) have been used to model the electromagnetic fields of electrical HTS devices. One of them is ANSYS, it implements the magnetic vector potential formulation, which uses three degrees of freedom in the non-conducting regions, the magnetic vector potential components, and adds an extra degree of freedom, the time-integrated electric voltage, in the conducting regions. The FEM models using the ANSYS Emag software for solving the transient electromagnetic problem for complex study (optimization and AC losses) of the 2G HTS cable had been developed
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