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Magnetic shielding is an effective means to reduce low-frequency magnetic fields emitted from power cables and busbars. However, shielding against unbalanced currents has not been addressed well. This paper introduces equivalent magnetic dipoles for discussing magnetic shielding under a monopole current source. It is found that shielding is achieved by the cancellation of magnetic fields from both...
This paper presents an efficient method for modeling 3-D magnetic plates used in low-frequency magnetic shielding. An extended formulation of partial element equivalent circuit is introduced. Both induced current and magnetization densities in the plates are approximated by an analytical function across plate thickness. The proposed method eliminates the need of plate meshing along its thickness,...
This paper presents an extended PEEC formulation for the evaluation of magnetic shielding at low frequency. The shielding is made by linear magnetic plates. In this formulation, circuit equations and constitutive relation were set up using both induced current and surface current of magnetization. With the analytical function for the induced current across the plate thickness, this approach eliminates...
This paper investigated the shielding effect of a metallic wire-grid structure found in modern buildings during an indirect lightning stroke. An equivalent circuit approach was employed to model the structure and nearby down conductor and to calculate the induced current in the structure. The resultant magnetic field inside the buildings was evaluated. It is revealed that the geometric parameters...
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