IEC TS 62997:2017
(Main)Industrial electroheating and electromagnetic processing equipment - Evaluation of hazards caused by magnetic nearfields from 1 Hz to 6 MHz
Industrial electroheating and electromagnetic processing equipment - Evaluation of hazards caused by magnetic nearfields from 1 Hz to 6 MHz
IEC/TS 62997:2017(E) specifies the characteristics of external magnetic nearfields, computations of and requirements on induced electric fields in body tissues in the frequency range from 1 Hz to 6 MHz with respect to induced electric shock phenomena, for electroheating (EH) based treatment technologies and for electromagnetic processing of materials (EPM). The phenomena include specific absorption rates with time integration.
General Information
Standards Content (Sample)
IEC TS 62997 ®
Edition 1.0 2017-06
TECHNICAL
SPECIFICATION
colour
inside
Industrial electroheating and electromagnetic processing equipment –
Evaluation of hazards caused by magnetic nearfields from 1 Hz to 6 MHz
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IEC TS 62997 ®
Edition 1.0 2017-06
TECHNICAL
SPECIFICATION
colour
inside
Industrial electroheating and electromagnetic processing equipment –
Evaluation of hazards caused by magnetic nearfields from 1 Hz to 6 MHz
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.180.10 ISBN 978-2-8322-4449-4
– 2 – IEC TS 62997:2017 © IEC 2017
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 11
2 Normative references . 11
3 Terms, definitions, symbols and abbreviated terms . 11
3.1 Terms and definitions . 11
3.2 Quantities and units . 14
4 Organisation and use of the technical specification . 15
5 The basic relationship for determination of the in situ induced electric field . 16
6 Requirements related to immediate nerve and muscle reactions . 16
6.1 General . 16
6.2 Method using the conductor geometry and current restriction (CGCR) . 17
6.3 Volunteer test method . 18
6.3.1 Volunteer basic test method . 18
6.3.2 Method based on volunteer tests and similarity with pre-existing
scenario . 19
6.3.3 Method based on volunteer tests, using available elevated conductor
current or shorter distance between the conductor and bodypart . 19
6.3.4 Method using magnetic nearfield reference levels (RLs) . 19
7 Requirements related to body tissue overheating . 19
7.1 General . 19
7.2 Intermittent conditions with 6 minutes time integration . 20
7.3 Intermittent conditions in fingers and hands with shorter integration times . 21
8 Calculations and numerical computations of induced E field and SAR by magnetic
nearfields: inaccuracies, uncertainties and safety factors . 21
8.1 Principles for handling levels of safety – general . 21
8.2 The C value variations with B field curvature . 22
8.3 Location of parts of the body, instrumentation and measurement issues . 22
8.4 Handling of inaccuracies of in situ E field and SAR numerical values . 22
8.5 Approaches to compliance . 23
8.5.1 General . 23
8.5.2 Cases where verification of levels being below the RL is sufficient . 23
8.5.3 Cases where only B flux measurements are sufficient . 23
8.5.4 Cases where the volunteer test method is applicable . 23
8.5.5 Cases where the CGCR method is applicable . 23
8.5.6 Cases where numerical modelling is carried out . 24
8.6 Summary of inaccuracy/uncertainty factors to be considered . 24
9 Risk group classification and warning marking . 24
9.1 General . 24
9.2 Induced electric fields from 1 Hz to 1 kHz . 25
9.3 Induced electric fields from 1 kHz to 100 kHz . 25
9.4 Induced electric fields from 100 kHz to 6 MHz . 25
9.5 Magnetic flux fields from 1 Hz to 6 MHz . 25
9.6 Warning marking . 25
Annex A (informative) Survey of basic restrictions, reference levels in other
standards, etc. . 27
A.1 Basic restrictions – general and deviations . 27
A.2 The coupling values C in ICNIRP guidelines and IEEE standards . 27
A.3 Basic restrictions – immediate nerve and muscle reactions . 28
A.4 Basic restrictions – specific absorption rates (SAR) . 29
A.5 Reference levels – external magnetic B field . 29
Annex B (normative) Analytical calculations of magnetically induced internal E field
phenomena . 30
B.1 Some basic formulas – magnetic fields and Laws of Nature . 30
B.2 Induced field deposition in tissues by magnetic nearfields . 31
B.3 Coupling of a homogeneous B field to homogeneous objects with simple
geometries . 31
B.4 Starting points for numerical modelling . 32
B.4.1 Relevant bodyparts . 32
B.4.2 The use of external B field and internal power density in numerical
modelling . 32
Annex C (normative) Reference objects representing parts of the body: tissue
conductivities . 33
C.1 Reference bodyparts . 33
C.1.1 General . 33
C.1.2 The wrist/arm models . 33
C.1.3 The hand model with tight fingers . 33
C.1.4 The hand model with spread-out fingers . 33
C.1.5 The finger model. 33
C.2 Dielectric properties of human tissues . 33
C.2.1 General data for assessments . 33
C.2.2 Inner parts of the body . 34
C.2.3 Skin data . 34
Annex D (informative) Results of numerical modelling with objects in a Helmholtz coil
and at a long straight conductor . 35
D.1 General and a large Helmholtz coil scenario with a diameter 200 mm sphere
– FDTD 3D modelling . 35
D.2 Other reference objects in the Helmholtz coil – FDTD 3D modelling . 36
D.2.1 The scenario . 36
D.2.2 Numerical modelling results with smaller spheres . 36
D.2.3 Numerical results with other objects . 37
Annex E (informative) Numerical FDTD modelling with objects at a long straight wire
conductor . 38
E.1 Scenario and general information . 38
E.2 Two 200 mm diameter spheres . 39
E.3 The hand model with tight fingers at different distances from the wire –
FDTD modelling . 40
E.3.1 General information and scenario . 40
E.3.2 Modelling results – power deposition patterns . 40
E.4 The hand model with tight fingers at 100 mm from the wire – Flux® 12 FEM
modelling . 42
E.5 Coupling data and analysis for the hand model with tight fingers above the
wire – FDTD modelling . 42
E.6 Coupling data and analysis for the wrist/arm model above the wire . 43
Annex F (informative) Numerical modelling and volunteer experiments with the hand
models at a coil. 45
F.1 General and on the B field amplitude . 45
– 4 – IEC TS 62997:2017 © IEC 2017
F.2 The hand model with tight fingers 2 mm, 4 mm, 6 mm and 50 mm above the
coil and with its right side above the coil axis – FDTD modelling . 46
F.2.1 The scenario . 46
F.2.2 Modelling results . 47
F.3 The
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