Electric fields in 400 kV transmission lines

The 400 kV transmission line electric field was measured, and these results were compared to the guidelines. Transmission lines were measured in surroundings of Tampere, Helsinki and Paimio for 25 spans with 38 measurements. In the study, the measured electric field values did exceed the 5 kV/m guideline for general public exposure by ICNIRP in 10 measured spans. The aim of this study was to compare measured 400 kV transmission line electric fields to the guidelines.