1、 IEC 61786-2 Edition 1.0 2014-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Measurement of DC magnetic, AC magnetic and AC electric fields from 1 Hz to 100 kHz with regard to exposure of human beings Part 2: Basic standard for measurements Mesure de champs magntiques continus et de champs magntique
2、s et lectriques alternatifs dans la plage de frquences de 1 Hz a 100 kHz dans leur rapport lexposition humaine Partie 2: Norme de base pour les mesures IEC 61786-2:2014-12(en-fr) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2014 IEC, Geneva, Switzerland All rights reserved. Unless
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20、us: csciec.ch. IEC 61786-2 Edition 1.0 2014-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Measurement of DC magnetic, AC magnetic and AC electric fields from 1 Hz to 100 kHz with regard to exposure of human beings Part 2: Basic standard for measurements Mesure de champs magntiques continus et de ch
21、amps magntiques et lectriques alternatifs dans la plage de frquences de 1 Hz a 100 kHz dans leur rapport lexposition humaine Partie 2: Norme de base pour les mesures INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE W ICS 17.220.20 PRICE CODE CODE PRIX ISBN 978-2-8
22、322-1970-6 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication
23、 via un distributeur agr. colour inside 2 IEC 61786-2:2014 IEC 2014 CONTENTS FOREWORD . 4 1 Scope 6 2 Normative references 7 3 Terms and definitions 7 4 General considerations 8 4.1 Different goals of measurement 8 4.1.1 General 8 4.1.2 Characterisation of field levels for compliance with safety sta
24、ndards 9 4.1.3 Characterisation of spatial variations 9 4.1.4 Characterisation of temporal variation 11 4.1.5 Characterisation of frequency content in magnetic field or electric field 12 4.1.6 Characterisation of population exposure to magnetic field and definition of metric . 13 4.2 Sources with mu
25、ltiple frequencies . 14 4.2.1 General 14 4.2.2 Sum of weighted magnitudes . 14 4.2.3 Weighted peak value 15 4.2.4 Impulse separation . 15 4.2.5 Weighted RMS value 15 4.2.6 Highest weighted spectral line 16 4.2.7 Conclusion and recommendation 16 4.3 Considerations before measurements . 16 5 Measureme
26、nt procedures and precaution 17 5.1 AC magnetic field 17 5.2 DC magnetic field . 18 5.3 AC electric field 19 6 Measurement uncertainty 21 7 Measurement report 22 Annex A (informative) Examples of fields characteristics in typical environments . 24 Annex B (informative) Examples of measurement distan
27、ces 27 B.1 IEC 62110:2009 9 . 27 B.2 IEC 62233: 2005 10 27 B.3 IEC 62311:2007 11 . 27 B.4 IEC 62369-1:2008 12 27 B.5 IEC/TS 62597:2011 14 27 B.6 IEC 62493:2009 13 . 28 Annex C (normative) Measurement uncertainty 29 C.1 Overview. 29 C.2 Assessment of type A uncertainty . 29 C.3 Assessment of type B u
28、ncertainty . 29 C.3.1 Non-uniform field . 29 C.3.2 Pass-band limitations 30 C.3.3 Temperature 30 C.3.4 Humidity 30 C.3.5 Location of measurement. 30 IEC 61786-2:2014 IEC 2014 3 C.3.6 Long-term drift . 31 C.3.7 Instrument time constant . 31 C.3.8 Proximity effect of observer (for electric field) . 31
29、 C.3.9 Correction factor 31 C.3.10 Hysteresis between scales 31 Annex D (informative) Example of measurement uncertainty 32 Bibliography 33 Figure 1 Magnetic field levels under a 77 kV overhead transmission line (from 9 ) . 10 Figure 2 Electric field levels under an overhead transmission line (from
30、9 ) 10 Figure 3 Example of load variation of 735kV line due to the human activities (daily) and outdoor temperature (seasonal) . 11 Figure 4 50 Hz magnetic field in a high speed train in France 12 Figure 5 Waveform (a) and frequency spectrum (b) of magnetic field generated by a 66,04 cm (26 inches)
31、flat-screen LCD television . 13 Figure 6 Example of DC magnetic field profile above DC underground cable (calculated at a height of 1 m) . 19 Figure 7 Observer proximity effects during electric field measurements in vertical electric field 20 Figure A.1 Magnetic field exposure of typical worker (ele
32、ctrician) in North American power plant (based on 3 days recording) 25 Figure B.1 Lighting equipment and measurement distances (from 13) 28 Table A.1 Example of field characteristics inside (workers environment) and outside (public environment) electric substations in a North American utility . 24 T
33、able A.2 Field characteristics (mT) in different mass transportation system in US: average and (maximum) . 26 Table D.1 Example of measurement uncertainty 32 4 IEC 61786-2:2014 IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MEASUREMENT OF DC MAGNETIC, AC MAGNETIC AND AC ELECTRIC FIELDS FROM 1
34、Hz TO 100 kHz WITH REGARD TO EXPOSURE OF HUMAN BEINGS Part 2: Basic standard for measurements FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of I
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44、pensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61786-
45、2 has been prepared by IEC technical committee 106: Methods for the assessment of electric, magnetic and electromagnetic fields associated with human exposure. The text of this standard is based on the following documents: FDIS Report on voting 106/322/FDIS 106/326/RVD Full information on the voting
46、 for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. IEC 61786-2:2014 IEC 2014 5 The committee has decided that the contents of this publication will remain unchanged
47、 until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page of this p
48、ublication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 6 IEC 61786-2:2014 IEC 2014 MEASUREMENT OF DC MAGNETIC, AC MAGNETIC AND AC ELECTRIC FIELDS FROM 1 Hz TO 10
49、0 kHz WITH REGARD TO EXPOSURE OF HUMAN BEINGS Part 2: Basic standard for measurements 1 Scope This part of IEC 61786 provides requirements for the measurement of quasi-static magnetic and electric fields that have a frequency content in the range 1 Hz to 100 kHz, and DC magnetic fields, to evaluate the exposure levels of the human body to these fields. Specifically, this standard gives
