Examples of occupational exposure to electric and magnetic fields at 110-kV gas-insulated substations (GISs).

The objectives of the study were to present examples of occupational exposure to electric and magnetic fields at gas-insulated substations (GISs) and to analyse the exposure according to the new European Directive 2013/35/EU. The aim was also to describe the details of the measurements of this study at GISs. Electric and magnetic fields were measured (45 measurements in total) at two GISs in the Tampere region of Finland. Inside the GISs, magnetic field values varied from 0.4 to 43.0 µT, and electric fields from 5 to 90 V m(-1). In the cable room of GIS B, the maximum value was 250 µT (very near the cables). The values did not exceed the low or high action levels of the new Directive 2013/35/EU. In conclusion, it can be stated that at 110-kV GISs, workers are not exposed to electromagnetic fields (EMFs) higher than the new European Directive 2013/35/EU.