Frankfurt Germany 6 -9 June 2011 RT 2

Frankfurt (Germany), 6 -9 June 2011 RT 2 c: EMF – Revision of magnetic field limits p p p Risk communication approach Case public exposure Case worker´s exposure Martti Hyvönen MD, Environmental Director at Helsinki Energy Chairman of Eurelectric WG Environment and Society Chairman of EMF Forum in Finland martti. hyvonen@helen. fi Phone: +358 50 364 8840 HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Communication - the implicit messages? p p p MF limit increased to 200 µT instead of 100 µT… Power lines are visible - substations near people EF limit decreased to avoid spark discharges … DSO´s EMF actions are based on … Health controls … HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Children´s playground under power line HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Children´s playground near power line City bridge (110 k. V cable) 110 k. V OH line; load 2 x 500 A 0, 16 µT at playground fence HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Public exposure to distribution substation MF HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Public exposure to distribution substation MF p Trans. Cat project – Categorization of indoor MV/LV transformer substations according to magnetic field exposure p 250 + 53 substations in Finland; by the structure of LV connection MF ≥ 100 µT possible when bus bars or cables near ceiling Measurement guide provided p p Kettunen K &al. : Magnetic field categorization in indoor MV/LV substations by the structure of the low voltage connection. Cired Conference Vienna 2007 p Trans. Expo project? ? In the appartment above, MF ≥ 0, 4 µT/24 h Hareuveny R, Kandel S, Yitzhak NM, Kheifets L, Mezei G: Exposure to 50 Hz magnetic fields in apartment buildings with indoor transformer stations in Israel. J Expo Sci Environ Epidemiol. 2010 HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Inspection round at a CCGT power plant 85 µT HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Inspection round at a CCGT power plant Steam T generator GT bus bar ≤ 1 µT 43 % of time max 401 µT (1732 µT) HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Work at distribution substations HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Work at distribution substations p MF-Safety project – Magnetic field safety in power distribution switchgears and substations p Evaluation of routine tasks with a simple flow chart Basic restriction 10 m. A/m 2 is not exceeded when MF <500 µT. But, higher induced currents possible in non-homogenous fields. The relation between MF and induced currents was similar to Dimbylov´s (2005) results. Substation tasks and layouts can be modified in a simple way to reduce exposure. There was no need to restrain routine work. p p p Keikko T &al: Magnetic field risk eavaluation of workers in indoor distribution substations. Cired Conference Prague 2009 HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Exposure to electric fields p p p High voltage lines are not a significant source of EF public exposure. However, EF guideline values (5 or 10 k. V/m) can be exceeded midspan in the Finnish countryside. At 400 k. V substation maintenance work EF up to 25 k. V/m, but, induced current densities were below the limit value 10 m. A/m 2 By grounding themselves skilled workers avoid spark discharges Korpinen L, Elovaara J, Kuisti H: Occupational exposure to electric fields and induced currents associated with 400 k. V substation tasks from different service platforms. Bioelectromagnetics 32, 1; 79– 83, Jan 2011 HYVONEN-FI-RT. 2 c

Frankfurt (Germany), 6 -9 June 2011 Communication - the implicit messages? p p p MF limit increased to 200 µT instead of 100 µT… Power lines are visible - substations near people EF limit decreased to avoid spark discharges … DSO´s EMF actions are based on … 0, 4 µT «yearly average» – precaution? Health controls: doctor´s magic touch? HYVONEN-FI-RT. 2 c