SIST EN 62858:2016

SLOVENSKI STANDARD
SIST EN 62858:2016
01-januar-2016
3RJRVWRVWVWUHOHQDRVQRYLVLVWHPRY]DORNDFLMRVWUHO//66SORãQDQDþHOD
Lightning density based on lightning location systems (LLS) - General principles
Densité de foudroiement basée sur des systèmes de localisation de la foudre (LLS) -
Principes généraux
Ta slovenski standard je istoveten z: EN 62858:2015
ICS:
91.120.40 =DãþLWDSUHGVWUHOR Lightning protection
SIST EN 62858:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62858:2016

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SIST EN 62858:2016


EUROPEAN STANDARD EN 62858

NORME EUROPÉENNE

EUROPÄISCHE NORM
November 2015
ICS 91.120.40; 29.020

English Version
Lightning density based on lightning location systems (LLS) -
General principles
(IEC 62858:2015)
Densité de foudroiement basée sur des systèmes de Blitzhäufigkeit basierend auf Blitzortungssystemen -
localisation de la foudre (LLS) - Principes généraux Allgemeine Grundsätze
(IEC 62858:2015) (IEC 62858:2015)
This European Standard was approved by CENELEC on 2015-09-09. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 62858:2015 E

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SIST EN 62858:2016
EN 62858:2015
European foreword
The text of document 81/470/FDIS, future edition 1 of IEC 62858, prepared by IEC/TC 81, "Lightning
protection", was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN 62858:2015.
The following dates are fixed:
– latest date by which this document has to be (dop) 2016-06-09
implemented at national level
by publication of an identical
national standard or by endorsement
– latest date by which the national standards conflicting (dow) 2018-09-09
with this document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62858:2015 was approved by CENELEC as a European
Standard without any modification.
2

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SIST EN 62858:2016
EN 62858:2015

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 62305-1 -  Protection against lightning -- Part 1: General EN 62305-1 -
principles
IEC 62305-2 -  Protection against lightning -- Part 2: Risk EN 62305-2 -
management

3

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SIST EN 62858:2016

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SIST EN 62858:2016



IEC 62858

®


Edition 1.0 2015-08




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Lightning density based on lightning location systems (LLS) – General

principles




Densité de foudroiement basée sur des systèmes de localisation de la foudre

(LLS) – Principes généraux

















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS : 29.020, 91.120.40 ISBN 978-2-8322-2820-3



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 62858:2016
– 2 – IEC 62858:2015 © IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Abbreviations . 7
4 General requirements . 8
4.1 General . 8
4.2 Stroke-to-flash grouping . 9
4.3 Minimum observation periods . 9
4.4 Observation area . 9
4.5 Grid cell size . 9
4.6 Edge effect correction . 10
5 Validation of lightning location system performance characteristics . 10
Bibliography . 12

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SIST EN 62858:2016
IEC 62858:2015 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

LIGHTNING DENSITY BASED ON LIGHTNING LOCATION SYSTEMS (LLS) –
GENERAL PRINCIPLES

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable 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 62858 has been prepared by IEC technical committee 81:
Lightning protection.
The text of this standard is based on the following documents:
FDIS Report on voting
81/470/FDIS 81/494/RVD

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.

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SIST EN 62858:2016
– 4 – IEC 62858:2015 © IEC 2015
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.

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SIST EN 62858:2016
IEC 62858:2015 © IEC 2015 – 5 –
INTRODUCTION
International standards for lightning protection (e.g. IEC 62305-2) provide methods for the
evaluation of the lightning risk on buildings and structures.
The lightning ground flash density N , defined as the mean number of lightning flashes to
G
ground per square kilometer per year is the primary input parameter to perform such an
evaluation.
In many areas of the world N is derived from data provided by lightning location systems
G
(LLS), but no common rule exists defining requirements either for their performance or for the
elaboration of the measured data.

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SIST EN 62858:2016
– 6 – IEC 62858:2015 © IEC 2015
LIGHTNING DENSITY BASED ON LIGHTNING LOCATION SYSTEMS (LLS) –
GENERAL PRINCIPLES



1 Scope
This International Standard introduces and discusses all necessary measures to make
reliable and homogeneous the values of N obtained from LLS in various countries. Only
G
parameters that are relevant to risk assessment are considered.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 62305-1, Protection against lightning – Part 1: General principles
IEC 62305-2, Protection against lightning – Part 2: Risk management
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62305-1 and
IEC 62305-2, as well as the following, apply.
3.1.1
cloud-to-ground lightning
CG
discharge that is comprised of one or more cloud-to-ground lightning strokes that propagate
from cloud to ground or vice versa and lead to a net transfer of charge between cloud and
ground
Note 1 to entry: This note applies to the French language only.
3.1.2
cloud lightning
IC
discharge occurring within or among thunderclouds (intracloud), or between thunderclouds
(intercloud), or between cloud and air, without a ground termination
Note 1 to entry: This note applies to the French language only.
3.1.3
first return stroke
first stroke to ground of a cloud-to-ground lightning discharge
Note 1 to entry: The stepped leader and attachment process precede the first return stroke.
3.1.4
subsequent stroke
subsequent stroke to ground that follows a previous (return) stroke in the same flash

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SIST EN 62858:2016
IEC 62858:2015 © IEC 2015 – 7 –
Note 1 to entry: A subsequent stroke is preceded by a dart leader and may or may not have the same ground
strike-point as any previous (return) stroke in the same flash.
3.1.5
multiplicity
number of first and subsequent strokes in a cloud-to-ground lightning flash
3.1.6
ground flash density
N
G
–2 –1
mean number of cloud-to-ground flashes per unit area per unit time (flashes × km × year )
3.1.7
ground strike-point density
N
SG
mean number of strike-points to ground or to ground based objects per unit area per unit time
–2 –1
(strike-points × km × year )
3.1.8
lightning sensor
device that measures electromagnetic signals produced by lightning discharges
3.1.9
lightning location system
LLS
network of lightning sensors that work together to detect and geolocate lightning events within
the area of the system’s coverage
Note 1 to entry: This note applies to the French language only.
3.1.10
confidence ellipse
ellipse centred on the estimated ground strike-point, describing the degree of confidence of
the location estimation (e.g. 50 %, 90 %, 99 %) based on sensor measurement errors
Note 1 to entry: The confidence ellipse is described in terms of the lengths of the semi-major and semi-minor
axes as well as the bearing of the semi-major axis.
3.1.11
uptime
duration of fully functional operation of a lightning location system sensor, expressed as a
percentage of the total observation time
3.1.12
stroke detection efficiency
flash detection efficiency
percentage of strokes or flashes detected as a percentage of the total number of strokes or
flashes occurring in reality
3.1.13
median location accuracy
median value of the distances between r
...