Power frequency electric and magnetic fields at a 110/20 kV substation

The aim of this paper is to study electric and magnetic fields at a 110/20 kV substation. The fields were measured on the switchyard of the substation. Magnetic field measurements were carried out at two heights along two straight lines and on a quadrangular area. The currents in the conductors were also recorded during the measurements. The highest magnetic field was 18.6 /spl mu/T at the height of 1.0 m and 14.8 /spl mu/T at 0.5 m. Electric fields were measured at 1 m height on the same area and on two other lines. The highest electric field was 4.6 kV/m. The highest magnetic fields were caused by the crossing of a busbar and an outgoing feeder with the highest load, and by a 20 kV cable from the transformer to a 20 kV switchgear. The highest electric fields were caused by conductors passing below bus bars.