  Recently, large offshore wind power plants have been installed far from the
shore, using long HVAC three-core armored cables to export power. Its high
capacitance may contribute to the appearance of unwanted phenomena, such as
overvoltages or resonances at low frequencies. To adequately assess these
problems, detailed and reliable cable models are required to develop
time-domain/frequency-domain analyses on this type of cables. This paper
presents, for the first time in the literature, an assessment on the
performance of 3D finite element method-based (3D-FEM) models for developing
frequency-domain analyses on three-core armored cables, confronting simulation
results with experimental measurements found in the literature for three real
cables. To this aim, a simplified ultra-shortened 3D-FEM model is proposed to
reduce the simulation time during frequency sweeps, through which relevant
aspects never analyzed before with frequency-domain 3D-FEM simulations are
addressed, such as total losses, induced sheath current, magnetic field around
the power cable, positive and zero sequence harmonic impedances, as well as
resonant frequencies. Also, a time-domain example derived from the
frequency-domain analysis is provided. Remarkable results are obtained when
comparing computed values and measurements, presenting the simplified
ultra-shortened 3DFEM model as a valuable tool for the frequency-domain
analysis of these cables.
