Assessment of H-field levels inside a DC railway substation

The results of a measurement campaign performed at Orte and S.Oreste substations along the high speed Italian railway line are presented and discussed. The presented results consist of H-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). This work is aimed both to collect meaningful values for the H-field intensity at substations (to contribute to standard preparation and update) and to determine suitable measuring procedures for this kind of tests.