  The great expansion in offshore power plants is raising the concern regarding
the cumulative effect of the electromagnetic field emissions caused by
submarine power cables. In this sense, owners are required to predict these
emissions during the permitting and consenting process of new power plants.
This is a challenging task, especially in the case of HVAC three-core armored
cables due to their complex geometry. Customarily, 2D approaches based on the
finite element method (FEM) have been employed for evaluating the magnetic
field emissions caused by these cables. However, inaccurate results are
obtained since the phase conductors and armor twisting is omitted. This work
develops, for the first time in the literature, an in-depth analysis of the
magnetic field caused by this type of cable through an ultra-shortened 3D-FEM
model, which is also faced to experimental measurements taken on an actual 132
kV, 800 mm2 three-core armored cable. Relevant conclusions are derived
regarding the impact of the cable design on the magnetic field emissions,
including material properties, as well as single and double-layer armors,
presenting the proposed model not only as a valuable tool for predicting
purposes, but also for optimizing cable design in terms of magnetic field
emissions.
