Low-Frequency Magnetic Field in

A measurement campaign was carried out at Orte and S.Oreste dc substations along a high-speed trunk of the Italian railway lines. The results consist of -field values measured at the two substations, inside the buildings (near the rectifier groups) and outside (in the area surrounding the high-voltage input line, the HV/MV transformers, and the rectifier transformers) for different load conditions during normal service. The goal of this work is to determine the -field intensity at low and medium frequency at dc railway substations. The measurement results are post-processed to extract statistical properties (namely, average values, dispersion, and distribution histograms). This information may contribute to updating and integrating standards regarding dc substation elec- tromagnetic environment and specific immunity tests for housed equipment.