This part of IEC 62271 gives practical guidance for the evaluation and documentation of the external electromagnetic fields which are generated by HV switchgear assemblies and HV/LV prefabricated substations. Basic requirements to measure or calculate the electric and magnetic fields are summarised for switchgear assemblies covered by IEC 62271-200 and IEC 62271-201, and for prefabricated substations covered by IEC 62271-202.

NOTE 1 The methods described in this technical report refer to three-phase equipment. However, the methodology may be used correspondingly for any single- or multi-phase equipment covered by this technical report.

This technical report applies to equipment rated for voltages up to and including 52 kV and power-frequencies from 15 Hz to 60 Hz. The electromagnetic fields which are generated by harmonics or transients are not considered in this technical report. However, the methods described are equally applicable to the harmonic fields of the power-frequency.

Detailed generic information on requirements and measurements of low-frequency electromagnetic fields is given in IEC 61786.

This technical report covers evaluation under factory or laboratory conditions before installation. The electric and the magnetic fields can be evaluated either by measurements or by calculations.

NOTE 2 Where practicable, the methods described in this technical report may also be used for installations on site.

It is not within the scope of this technical report to specify limit values of electromagnetic fields or methods for the assessment of human exposure.

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PDF Pages	PDF Title
6	English CONTENTS
8	INTRODUCTION
9	1 Scope 2 Normative references
10	3 Terms and definitions
11	4 Evaluation requirements 4.1 General 4.2 Methods of evaluation
12	4.3 Evaluation of electric fields 4.4 Evaluation of magnetic fields
13	Figures Figure 1 – Example of test circuits configuration to obtain the maximum external magnetic field of a switchgear assembly and/or a prefabricated substation
14	5 Measurements 5.1 General 5.2 Measuring instruments 5.3 Measurement procedures
15	Figure 2 – Reference surface (RS) for equipment of irregular shape
16	Figure 3 – Scanning areas to find the hot spots
17	Figure 4 – Determination of the field variation as a function of the distance from the hot spot locations (perpendicular to the reference surface)
19	5.4 Measurement set-up
20	Figure 5 – Test set-up of main components, external cables, hot spot locations and measurement volume
21	Figure 6 – Test circuit for electric and magnetic field measurement
22	6 Calculations 6.1 General
23	6.2 Software 6.3 Calculation procedures 6.4 Results
24	6.5 Validation 7 Documentation 7.1 Characteristics of the HV switchgear assembly or prefabricated substation 7.2 Evaluation method 7.3 Presentation of the measurement results
25	7.4 Presentation of the calculation results
26	Annex A (informative) Presentation of E or B field measurement data – Example for a typical HV/LV pre-fabricated substation Figure A.1 – Hot spot locations representing the field maxima
27	Figure A.2 – Graphical presentation of the field variation Tables Table A.1 – Listing of the hot spot coordinates Table A.2 – Variation of field values for one hot spot
28	Figure A.3 – Example diagram for the field variation at hot spots Table A.3 – Background fields
29	Annex B (informative) Examples of analytical solutions to benchmark EMF calculations Figure B.1 – Schematic for 3-phase magnetic field calculation
32	Figure B.2 – Variation of resultant magnetic field around 3-phase cable Table B.1 – Values of Hres for spatial angles θ and time angles ωt
33	Figure B.3 – Maximum resultant magnetic field around 3-phase cable
34	Table B.2 – Values of maximum Hres for spatial angles θ
37	Figure B.4 – Schematic for 3-phase electric field calculation
40	Figure B.5 – Variation of resultant electric field around 3-phase cable
41	Table B.3 – Values of Eres for spatial angles θ and time angles ωt
42	Figure B.6 – Maximum resultant electric field around 3-phase cable Table B.4 – Values of maximum E for spatial angles θ
47	Bibliography

Status	Definitive
Pages	50
Publication Date	2010-07-31
ISBN	978 0 580 58958 4
Standard Number	PD CLC/TR 62271-208:2010
Title	High-voltage switchgear and controlgear – Methods to quantify the steady state, power-frequency electromagnetic fields generated by HV switchgear assemblies and HV/LV prefabricated substations
Identical National Standard Of	CLC/TR 62271-208:2010, IEC TR 62271-208:2009
Descriptors	Mathematical calculations, Magnetic flux density, Magnetic fields, Low voltage, High voltage, Magnetic field measurement, Electromagnetic fields, Switchgear, Electric substations, Prefabricated parts, Electric fields, Electric control equipment, Electrical equipment, High-voltage equipment, Electrical measurement, Field strength (electric)
Publisher	BSI
Committee	PEL/17
ICS Codes	29.130.10 - High voltage switchgear and controlgear


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