1. Frankfurt (Germany), 6-9 June 2011 Abart-AT-RT.2c RT 2c: EMF – Revision of magnetic field limits  simple assessment procedure for 3-phase Systems  practical approach for measurements  practical experiences Andreas Abart Energie AG Oberoesterreichalso lecturer at TU Graz Asset management Power Quality & EMC andreas.abart@netzgmbh.at Phone: +43 5 9070 2107 Abart-AT-RT.2c RT 2c: EMF – Revision of magnetic field limits

2. Frankfurt (Germany), 6-9 June 2011 1st. Step of Assessment: simple Estimation (magnetic field: 1 mT/kA at 0.2 m distance) No further Assessment in case occupational Exposure: Electric fields at rated voltage < 250 kV generators and transformers Any wire at maximum current < 1 kA (50 Hz) Compliance demonstrated? – Yes => End of Assessment 2nd. Step of Assesment: regarding given compensation effects from parallel wires. Compliance demonstrated? – Yes => End of Assessment 3rd. Step of Assesment (expert job): Measurements including all shielding effects

3. Frankfurt (Germany), 6-9 June 2011 Abart-AT-RT.2c RT 2c: EMF – Revision of magnetic field limits magnetic flux density B=f(a,d)

4. Frankfurt (Germany), 6-9 June 2011 Abart-AT-RT.2c RT 2c: EMF – Revision of magnetic field limits Abart, 15.01.2007, Seite 4 EMF-Exposure

5. Frankfurt (Germany), 6-9 June 2011 Abart-AT-RT.2c RT 2c: EMF – Revision of magnetic field limits occupational exposure (1000µT) General public/office(200µT)

6. Frankfurt (Germany), 6-9 June 2011 Abart-AT-RT.2c RT 2c: EMF – Revision of magnetic field limits ASSESSMENT:  Estimation,  Calculation  Measurement  Calculation & Measurement

7. Frankfurt (Germany), 6-9 June 2011 Abart-AT-RT.2c RT 2c: EMF – Revision of magnetic field limits Measurements in Practice  applying summation Formula according to ICNIRP Guidelines => Exp=Sum of Signal + Sum of noise  following Jokelas approach 2003 (regarding phase of each spectral component) is helpful but complicating processing of measurement data.  regarding spectral components > X% of limits like standards for welding equipement suggest.  RMS of spectral components weighted on limits following the EN 50366 approach (household appliances)