## 3 Results
### Numerical Simulations of Electric and Magnetic Field Intensities around Energy Infrastructure

Table 1: The maximum measured values of electric (\(E_{max}\)) and magnetic (\(H_{max}\)) field intensity. Figure 4: Results of numerical simulations for the distribution of the electric field intensity \(E\): (**A**) coordinates of suspension of wires of span 51–52 in the vicinity of the warehouse (phase wires L1–L3, shield line—LR). The earth potential of 0 V was assumed on the walls and roof of the warehouse. The red line marks the height of 2 m above the ground. (**B**) Electric field level at a height of 2.0 m above the ground according to the profile given in Figure 4A) (solid red line) calculated for catastrophic conditions assuming a height of 5.8 m for the lowest conductors above the ground. Figure 5: Results of numerical simulations for the distribution of the electric field intensity \(E\): (**A**) wire distribution profile, (**B**) electric field level on the roof and side wall of the warehouse according to the profile marked in red in Figure 5A). The local maximum for the abscissa of 8 m results from the field concentration at the assumed radius of rounding the roof edge of r = 0.2 m.  
Figure 7A determines the \(H\) value on the roof surface and on the side wall of the warehouse. In each case, the maximum value of \(H\) does not exceed \(H_{max}\) = 125.0 A /m on the side walls and roof (Figure 7B) and \(H_{2m}\) = 96.0 A /m at a height of 2 m above the ground. In a similar way, numerical simulations were performed for other selected objects. The obtained values of \(E_{max}\), \(E_{2m}\), \(H_{max}\) and \(H_{2m}\) are listed in Table 2. A short characterization of the investigated cases is described below:  
* A multi-family building with balconies near double-track 110 kV overhead lines: The analysis was carried out under the following assumptions: the building on the side of the line has balconies placed, according to the design, at a minimum distance of 6 m from the line (horizontal projection). The double-circuit line is characterized by the following technical parameters of poles and conductors (the heights of suspension are given in relation to the base of the poles, taking into account the dimensions of the insulators): OS24 P+5-type poles, a suspension height of the lowest conductor of 19.4 m and a span length equal to 240 m. The minimum suspension height of the lowest phase wire was estimated at 11.9 m. For the line located closer to the building, the maximum phase current value is 460 A. For the other line, the maximum phase current value is 230.0 A;
* A shopping center under a 110 kV overhead line: A commercial building located partially under a high-voltage line with the following parameters: an SW24 ON120+10 pole with a suspension height of the lowest conductor of 23.9 m and an S24 ON120+10 pole with a suspension height of the lowest conductor of 21.8 m. In the analyzed case,  
Figure 6: Results of numerical simulations for the distribution of the magnetic field intensity \(H\): (**A**) Magnetic field distribution in the warehouse environment. Coordinates of suspension of cables of span 51–52 in the vicinity of the warehouse (phase cables L1–L3, lightning rod—LR). The walls and roof of the warehouse are made of 3 mm thick steel. The height of 2.0 m above the ground is marked with a red line. (**B**) The level of the magnetic field at a height of 2.0 m above the ground in accordance with the profile given in Figure 6A) (red line) calculated for catastrophic conditions assuming the height of the lowest cables above the ground of 5.8 m. The hall walls are made of structural steel. The maximum value of the field intensity occurs at the warehouse wall. the span length was 256.1 m. The value of the long-term current-carrying capacity in the phase cables was 634 A. For the simulation purposes, the maximum permissible cable proximity of 6.4 m to the roof of the building was assumed;
* A residential building next to double-track overhead 110 kV lines: A single-family house located in the vicinity of a 110 kV double-circuit overhead line.