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This paper analyzes different ways to simulate electromagnetically three-corearmored cables in 3D by means of the finite element method. Full periodicmodels, as lengthy as 36 m, are developed to evaluate the accuracy whensimulating only a small portion of the cable, as commonly employed in theliterature. The adequate length and boundary conditions for having the sameaccuracy of full periodic models are also studied. To this aim, five mediumvoltage and high voltage armored cables are analyzed, obtaining the minimumlength of the cable that may be simulated for having accurate results inshorter time and with less computational burden. This also results in theproposal of a new method comprising the advantages of short geometries and theapplicability of periodic boundary conditions. Its accuracy is compared withexperimental measurements and the IEC standard for 145 kV and 245 kV cables.The results show a very good agreement between simulations and measurements(errors below 4 %), obtaining a reduction in the computation time of about 90%. This new method brings a more effective tool for saving time andcomputational resources in cable design and the development of new analyticalexpressions for improving the IEC standard.

On Simplified 3D Finite Element Simulations of Three-core Armored Power Cables