Evaluation of low-frequency flux density level within an industrial application

The magnetic flux density surrounding the power electrical network involved in a power sub-station is evaluated. Such calculations were done to insure the low enough level of induction required by semiconductor chips production. Others devices, such as electromagnets, power supplies, also included in the sub-station are not taken into account. Due to the volume of the surrounding air compared with the size of conductors, this problem is too huge and too ill-conditioned to be tackled with the so-called finite element method. To circumvent this drawback, the partial element electrical circuit method is used to model the conductors, determine current density and obtain flux density in every point in the space. According to the geometry of conductors in the sub-station, flux density levels are given, firstly for balanced currents, and then for unbalanced conditions.