Occupational Magnetic Field Exposure in Electric Distribution Substations

T. Keikko, R. Seesvuori, and P. Järventausta (Finland)


Modeling and Simulation of Power Systems, Magnetic fields, Electric distribution substation, and European Parliament and Council Directive.


Due to the possible health effects of the electric and magnetic fields, the ICNIRP (International Commission on Non-Ionizing Radiation Protection) has published the guidelines, in which upper limits for occupational exposure have been presented. Based on the ICNIRP guidelines 1998, a European Parliament and Council Directive on minimum health and safety requirements regarding the exposure of workers to electromagnetic fields, has been adapted in spring 2004. The upper limit for occupational exposure to 50 Hz magnetic fields is 500 µT. However, the harmonic content of the magnetic fields affects to the allowable 50 Hz magnetic field more than previously supposed. The aim of this study was to investigate magnetic fields in electric distribution (20/0.4 kV) substations from the occupational exposure point of view. Based on the studied situations, the need for the reduction of the occupational exposure was rated. Keeping up of the distance from the powered conductors is the best reduction solution from exposure point of view.

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