## 3 Results
### Numerical Simulations of Electric and Magnetic Field Intensities around Energy Infrastructure  
The actual values of \(E\) and \(H\) depend on the configuration of the lines and objects nearby and are usually determined using finite element method calculations in specialized software. Below is an extreme case of the actual implementation of an industrial warehouse located only 4.5 m from the outermost conductors of a two-track 110 kV high-voltage line. Analysis of the field distribution in the FEMM software was performed for specific boundary conditions, i.e., with phase conductors L1 closest to the warehouse walls reaching the highest peak phase voltage value of 100.3 kV, while the remaining phases L2 and L3 reach values of \((-50.1)\) kV. Therefore, all analysis results are given in maximum voltage values related to 1 m. Furthermore, it was assumed that the lightning rod and the construction outline of the proposed warehouse with an external conducting facade have a ground potential of 0 V. Distances between the conductors were determined according to the data for D2 ON and P series poles (Figure 4A). Due to the close proximity of the outer conductors of the overhead line to the structure of the proposed warehouse, to limit corona discharges, it is recommended to round off the side edges, especially where there is proximity to the 110 kV line. In the calculations, this rounding was set at r = 0.2 m. Figure 4B shows the distribution of \(E\) at a height of 2.0 m above ground level (\(E_{2m}\)). Because of the shielding of EF by the building structure (Faraday cage), its intensity inside is equal to 0 kV/m. Figure 5A specifies the values of \(E\) on the roof surface and on the side wall of the warehouse. For the analyzed cases, the maximum value of \(E\) does not exceed \(E_{max}\) = 4.0 kV/m on the side walls and roof (Figure 5B) and \(E_{2m}\) = 3.0 kV/m at a height of 2.0 m above ground level. The \(H\) value for the 50 Hz component was calculated assuming a restriction based on the occurrence of maximum current values in phases L1, L3 (track 1) and L1 (track 2) located closest to the side plane of the warehouse. According to the obtained data, instantaneous maximum current values of 888.3 A were assumed for phases L1 and L3 (track 1), corresponding to an effective value of 630 A resulting from the assumed long-term load capacity of the conductors for temperatures below 10 \({}^{\circ}\)C. In the remaining phases L2 and L3 (track 2), there is a negative instantaneous current value (\(-444.15\) A). To restrict the simulation results, the current value in phase L3 was set to match that of phase L1 for the line closer to the warehouse wall (assumption of a critical asymmetry of load currents resulting in an increase in the magnetic field level). Aluminum lines were assumed, and a 3 mm thick steel sheet was assumed for the warehouse construction to ensure proper mesh generation in the FEMM program. In practice, with smaller steel thicknesses or for other materials, there the attenuation of the MF is smaller, and the field penetrates into the interior of the warehouse. In Figure 6, the distribution of \(H\) at a height of 2 m above the ground surface (\(H_{2m}\)) is shown. It is worth noting that, unlike the EF, the MF is able to penetrate the interior of the building under investigation. \begin{table}
\begin{tabular}{l l l l} \hline  & **Investigated Object** & **E\({}_{\text{max}}\) [kV/m]** & **H\({}_{\text{max}}\) [A/m]** \\ \hline
1 & Transformer-distribution station 15 kV/0.4 kV & \textless{}0.05 & 5.3 \\
2 & Building plot under 110 kV overhead line (only \(E\)) & 0.83 & - \\
3 & Multi-family building with balconies near 110 kV & 1.2 & \textless{}0.2 \\  & overhead line & & \\
4 & Office space with inappropriate equipotential & - & 4 \\  & bonding (only H) & & \\
5 & Room above the MV/LV indoor station (only \(E\)) & 4.01 & - \\
6 & LV switchboard (only H) & & - & \textless{}16 \\ \hline \end{tabular}
\end{table}