AC 3 phase magnetic fields around main board and cable traces
#Magnetic Fields, #3 phases, #Comsol Multiphysics, #Civil Engineering, #Power panels
Challenge
A hospital was being designed, where the electrical installations were to be powered from a main panel in the building basement. Large cable traces and canals were feeding the input of the panel and large cable routing containing various cable geometries and loads were distributing the power on the other side.
The electrical engineer designing the installation had to document that the magnetic field surrounding the panels and cable routing would not exceed the threshold for magnetic fields in hospitals, as defined in DS/HD 60364-7-710, Annex C. If threshold values were exceeded, mitigation measures were requested.
Upvious contribution
Upvious received the building 2D drawings and schematics of the electrical installation, and designed a 3D replica of the geometries including building structures, power panels and cables and canal feeders in the numerically FEM based software Comsol Multiphysics.
Power levels distributed in the various cables were identified, shielding of canals was implemented, and the attenuation of the different building masses were found. The 3D model was secondly used to calculate the magnetic field distribution and highlight areas within the building where thresholds were exceeded.
Results
A few areas on the floor on top of the power panels were the magnetic fields exceeded the threshold values were identified, and a solution with magnetic shielding foil was suggested to mitigate the problem. Contact with the local distributor of the attenuating foil were established, and the sufficient number of layers suggested. The customer was provided with a comprehensive report, to understand the situation and the mitigation measures, and to document the process. This enabled the detailed engineering of the solution as well as sourcing of the field attenuating foil.
