Abstract
In this paper an in-depth parametric analysis of shielding efiectiveness obtained when using ferromagnetic or conductive screens to mitigate the fleld generated by duct banks is presented. Due to the need of a case-by-case approach, all the simulations, performed by a flnite element software (GetDp), are applied to a case study composed by 9 (3 £ 3) ducts, with six of them including high voltage single-core cables and the three left empty for eventual future expansion. Two shielding geometries are tested: horizontal and U-reverse, changing in each one the main parameters: width, thickness, clearance to conductors, etc. Moreover, the conductors are grouped in two balanced in-phase three-phase circuits arranged in three conflgurations: vertical, horizontal and triangular. The mutual phase ordering of both circuits is the one that minimizes the fleld, so no further fleld reduction can be obtained by simple methods. The power losses and cost of difierent shielding solutions are also presented, including the efiect of adding a third circuit if required.
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