Abstract
The program OPERA/ELEKTRA of Vector Fields Ltd, Oxford, has been used for studies of shielding of 50 Hz magnetic fields, created by high currents in substation bus bars. A 3D finite element model (FEM) is used for analyzing the shielding effectiveness of an eddy current shield applied in the room of a 10/0.4 kV substation in order to reduce the flux density in an office situated above the substation. The influence of the shield extension is studied, and a calculated magnetic field attenuation of 30 dB is obtained for a 5 mm aluminum shield applied to the ceiling and the walls. The calculations have shown a strong geometry dependence of the magnetic shielding effectiveness at low frequencies. With a 3D model, the eddy current distribution in the shield can be studied, giving guidance for door positioning. The influence of shield conductivity is also analyzed
Hamnerius, Y;
Hasselgren, L;
[1]
Moeller, E
[2]
- Chalmers Univ. of Technology, Gothenburg (Sweden). Dept. of Microwave Technology
- Linkoeping Univ. (Sweden). Dept. of Physics and Measurement Technology
Citation Formats
Hamnerius, Y, Hasselgren, L, and Moeller, E.
Calculation of shield of 50 Hz magnetic fields by OPERA/ELEKTRA.
Sweden: N. p.,
1993.
Web.
Hamnerius, Y, Hasselgren, L, & Moeller, E.
Calculation of shield of 50 Hz magnetic fields by OPERA/ELEKTRA.
Sweden.
Hamnerius, Y, Hasselgren, L, and Moeller, E.
1993.
"Calculation of shield of 50 Hz magnetic fields by OPERA/ELEKTRA."
Sweden.
@misc{etde_10142882,
title = {Calculation of shield of 50 Hz magnetic fields by OPERA/ELEKTRA}
author = {Hamnerius, Y, Hasselgren, L, and Moeller, E}
abstractNote = {The program OPERA/ELEKTRA of Vector Fields Ltd, Oxford, has been used for studies of shielding of 50 Hz magnetic fields, created by high currents in substation bus bars. A 3D finite element model (FEM) is used for analyzing the shielding effectiveness of an eddy current shield applied in the room of a 10/0.4 kV substation in order to reduce the flux density in an office situated above the substation. The influence of the shield extension is studied, and a calculated magnetic field attenuation of 30 dB is obtained for a 5 mm aluminum shield applied to the ceiling and the walls. The calculations have shown a strong geometry dependence of the magnetic shielding effectiveness at low frequencies. With a 3D model, the eddy current distribution in the shield can be studied, giving guidance for door positioning. The influence of shield conductivity is also analyzed}
place = {Sweden}
year = {1993}
month = {Sep}
}
title = {Calculation of shield of 50 Hz magnetic fields by OPERA/ELEKTRA}
author = {Hamnerius, Y, Hasselgren, L, and Moeller, E}
abstractNote = {The program OPERA/ELEKTRA of Vector Fields Ltd, Oxford, has been used for studies of shielding of 50 Hz magnetic fields, created by high currents in substation bus bars. A 3D finite element model (FEM) is used for analyzing the shielding effectiveness of an eddy current shield applied in the room of a 10/0.4 kV substation in order to reduce the flux density in an office situated above the substation. The influence of the shield extension is studied, and a calculated magnetic field attenuation of 30 dB is obtained for a 5 mm aluminum shield applied to the ceiling and the walls. The calculations have shown a strong geometry dependence of the magnetic shielding effectiveness at low frequencies. With a 3D model, the eddy current distribution in the shield can be studied, giving guidance for door positioning. The influence of shield conductivity is also analyzed}
place = {Sweden}
year = {1993}
month = {Sep}
}