Analysis and Mitigation of Electromagnetic Exposure in Road Infrastructure Crossings with High-Voltage Transmission Lines: An Applied Study on Operational Safety
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Abstract
This study aimed to evaluate the electric and magnetic fields generated by a 500 kV transmission line over a pedestrian bridge, assess compliance with applicable standards, and propose mitigation measures. The analysis employed Maxwell’s potential-coefficient formulations for the electric field and the Biot–Savart law for the magnetic field. A bundle of four subconductors per phase, operating currents of 2000 A and 4083 A, and the occurrence of microdischarge phenomena were considered. The maximum electric field reached 3.12 kV/m, while the maximum magnetic field was 42.24 μT, both remaining below the limits established by RETIE and ICNIRP. Although microdischarges may be perceptible, they do not pose a health risk. The close proximity between roadway infrastructure and high-voltage transmission lines underscores the need for actions that reduce perceived risk and ensure adequate safety in accordance with international regulations. Under appropriate mitigation measures—such as equipotential bonding, grounding, handrail insulation, and operational control—the coexistence of the pedestrian bridge and the transmission line is considered technically feasible.
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