Computational and Experimental Studies on the Efficiency of Combined Electromagnetic Shielding of the Magnetic Field of Overhead Power Lines

To improve the efficiency of reducing the power frequency of the magnetic field generated by overhead power lines in residential buildings, experimental studies based on the results of 3D modeling when using a combined electromagnetic shield consisting of active and passive parts were conducted. The problem of designing a combined electromagnetic shield consisting of a robust active shielding system and an electromagnetic passive shield is solved on the basis of a multi-criteria antagonistic game between two players. The vector of game wins is calculated using the finite element calculation system COMSOL Multiphysics, and the game solution is calculated using particle multiswarm optimization algorithms. When designing combined electromagnetic shields, the coordinates of the spatial location of the shielding winding, currents and phases in the shielding windings of the robust active shielding system, as well as the geometric dimensions and thickness of the electromagnetic passive shield, were calculated. The results of experimental studies of the effectiveness of magnetic field shielding using 3D modeling for a residential building and a power line, when using combined electromagnetic shielding with active and passive parts, are given. For the first time, in order to increase the effectiveness of a combined electromagnetic shield, which consists of active and passive parts, and is designed to reduce the industrial frequency of the magnetic field created by overhead power lines in residential buildings, experimental studies using 3D modeling were conducted. According to the results of experimental studies, the effectiveness of shielding the output magnetic field was determined. It was found that the shielding coefficient of the electromagnetic passive shield is more than two units, and the effectiveness of the system with an active shield is more than four units, and for a system with a combined electromagnetic passive and active shield it is more than 10 units. The possibility of reducing the level of magnetic field induction in a residential building from power lines when using combined electromagnetic passive and active shielding to a level safe for the population is proven.