IEC TS 61000-5-8:2009

IEC/TS 61000-5-8 ®
Edition 1.0 2009-08
TECHNICAL
SPECIFICATION
colour
inside
BASIC EMC PUBLICATION
Electromagnetic compatibility (EMC) –
Part 5-8: Installation and mitigation guidelines – HEMP protection methods for
the distributed infrastructure

IEC/TS 61000-5-8:2009(E)
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IEC/TS 61000-5-8 ®
Edition 1.0 2009-08
TECHNICAL
SPECIFICATION
colour
inside
BASIC EMC PUBLICATION
Electromagnetic compatibility (EMC) –
Part 5-8: Installation and mitigation guidelines – HEMP protection methods for
the distributed infrastructure

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 33.100.20 ISBN 978-2-88910-395-9
– 2 – 61000-5-8 © IEC:2009(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .8
4 General introduction .10
5 Description of the distributed infrastructure .10
6 Spatial variation of HEMP environments .11
6.1 Early-time (E1) HEMP spatial variations .11
6.2 Intermediate-time (E2) HEMP spatial variations.13
6.3 Late-time (E3) HEMP spatial variations .13
7 Implications for HEMP coupling to extended conductors .13
7.1 General .13
7.2 Early-time (E1) conducted environments .13
7.3 Intermediate-time (E2) conducted environments .14
7.4 Late-time (E3) conducted environments .15
8 Relation of HEMP disturbances to natural EM environments.16
8.1 General .16
8.2 Comparison of HEMP E1 to EFT and surge .16
8.3 Comparison of HEMP E3 to currents induced by geomagnetic storms .17
9 Protection strategy .18
9.1 General .18
9.2 Electric power .18
9.2.1 Background .18
9.2.2 Emergency planning, operating procedures and restoration.20
9.2.3 HEMP immunity standards for new equipment .20
9.2.4 Selected retrofit protection.21
9.2.5 Application to a high-voltage power substation .22
9.3 Telecommunication centres .25
9.4 Other infrastructures .25
Bibliography.26

Figure 1 – Simplified depiction of the interdependency of critical infrastructures [4] .11
Figure 2 – E1 HEMP tangent radius as a function of the height of burst .12
Figure 3 – An example of the area covered by the early-time (E1) HEMP by a 170 km
burst over the United States .12
Figure 4 – Late-time (E3) electric field waveform from IEC 61000-2-9.17
Figure 5 – Vertical conduit geometry for a current transformer (CT) .23
Figure 6 – Covered shallow trench for control cables .23
Figure 7 – Grounding of control cables at junction box.24
Figure 8 – Control cable access to equipment.24

Table 1 – Peak currents induced by the E1 HEMP on above-ground and buried
conductors.14

61000-5-8 © IEC:2009(E) – 3 –
Table 2 – Peak currents induced by the E2 HEMP on above-ground and buried
conductors.15
Table 3 – Minimum required attenuation of peak time domain external environments for
the six principal protection concepts .21

– 4 – 61000-5-8 © IEC:2009(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 5-8: Installation and mitigation guidelines –
HEMP protection methods for the distributed infrastructure

FOREWORD
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The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC/TS 61000-5-8, which is a technical specification, has been prepared by subcommittee
77C: High power transient phenomena, of IEC technical committee 77: Electromagnetic
compatibility.
61000-5-8 © IEC:2009(E) – 5 –
This Technical Specification forms Part 5-8 of IEC 61000. It has the status of a basic EMC
1)
publication in accordance with IEC Guide 107 [1] .
This document is being issued in the Technical Specification series of publications (according
to the ISO/IEC Directives, Part 1, 3.1.1.1) as a “prospective standard for provisional
application” in the field of protection of the infrastructure against HEMP because there is an
urgent need for guidance on how standards in this field should be used to meet an identified
need.
This document is not to be regarded as an “International Standard”. It is proposed for
provisional application so that information and experience of its use in practice may be
gathered. Comments on the content of this document should be sent to the IEC Central
Office.
A review of this Technical Specification will be carried out not later than 3 years after its
publication with the options of: extension for another 3 years; conversion into an International
Standard; or withdrawal.
The text of this standard is based on the following documents:
Enquiry draft Report on voting
77C/192/DTS 77C/196/RVC
Full information on the voting 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.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
A bilingual version of this publication may be issued at a later date.

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