EXAMINATION ABOUT THE EFFECTS OF OPENING OF THE MAGNETIC SHIELD PLATE AROUND THE ELECTRIC POWER LINE

Abstract

 Magnetic shielding in a building requires a method for thermal radiation. Therefore, magnetic shielding effectiveness when magnetic material of perforated metal surrounds four aspects of electric power line circumference was examined by both of a physical experiment with practical size of three-phase electric power line and a simulation experiment with finite element method. In the results, high magnetic shielding effectiveness was observed under a condition of large opening ratio, however the condition can easily lead magnetic saturation at relatively low AC current. In addition, a difference of opening alignments made a small difference which can be ignored.