PurposeThe purpose of this paper is to present an approach to design passive loop systems in order to reach good performances.Design/methodology/approachThe optimization has been performed by means of the MATLAB optimization toolbox “Gatool” which solves the optimization problems with a genetic algorithm.FindingsSeveral configurations have been analyzed by varying the number of loops from 2 to 15, whose geometry has been chosen by the genetic algorithm. Considering a five loops configuration, along the reference path it is possible to obtain a shielding factor almost constant and equal to 3.5.Originality/valueThe optimized configurations have been compared with a practical employed layout composed of 17 closed loops placed above and around the junction zone. The shielding factors obtained by the six loops configuration are comparable with the ones of the practical layout.
Contact with energized parts at different potentials may cause the circulation of body current and the possible inception of the ventricular fibrillation, which is generally considered the most life-threatening effect imposed on the cardiac muscle. The heart-current factors currently present in international standard have been determined owing to measurements on cadavers as well as experiments with volunteers. Due to the difficulties in experimental verifications, the authors propose the use of numerical techniques to investigate the behavior of the human body when it is subjected to electric fields, with the fundamental purpose of increasing the electrical safety of installations. This work is based on a mathematical representation of the human anatomy, which takes into account the boundaries of the internal organs. The simulations carried out and documented in this paper show results that do not entirely match the published IEC heartcurrent factors; most noticeably, for the pathways hands-feet, right hand-feet, and left hand-right foot, the heart-current factors seem to be overestimated by the IEC.
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