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Документ Normalization of double-circuit overhead line magnetic field inside khrushchev building(Національний технічний університет "Харківський політехнічний інститут", 2021) Chunikhin, K. V.; Grinchenko, V. S.This paper deals with the mitigation of 110 kV double-circuit overhead line magnetic field inside five-story Khrushchev buildings. We show that the magnetic field can exceed the reference level 0.5 μT in 90 % part of living space. To mitigate the magnetic field, we propose the inverted L-shaped grid shield with conductors on the wall and in the attic of the building. Using the analytical model of the grid shield and the numerical simulation, we determine the parameters of the L-shaped grid shield which provides the magnetic field normalization in 97 % part of living space. Further improvement of the grid shield profile, in particular, the placement of some conductors in the basement, allows to reduce the quantity of metal of the shield by 15 % while maintaining the shielding efficiency. Also we consider the magnetic field normalization for the overhead line with a rated current of 500 A. In this case, the quantity of metal of the grid shield increases 2.74 times.Документ Low-frequency magnetic field shielding by a circular passive loop and closed shells(НТУ "ХПИ", 2016) Grinchenko, V. S.; Chunikhin, K. V.; Grinchenko, N. V.We have obtained dependences of the shielding factors for passive loops and shells on the frequency of the external field. Analytically determined frequency of the external magnetic field, below which field shielding of a passive loop is expedient to use, above which it is advisable touse a shielding shell.