In this paper we derive the integral equations for radially and polygonally
arranged high-temperature superconductor thin tapes and we solve them by
finite-element method. The superconductor is modeled with a non-linear power
law, which allows the possibility of considering the dependence of the
parameters on the magnetic field or the position. The ac losses are computed
for a variety of geometrical configurations and for various values of the
transport current. Differences with respect to existing analytical models,
which are developed in the framework of the critical state model and only for
certain values of the transport current, are pointed out
