1、 IEC 62858 Edition 1.0 2015-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Lightning density based on lightning location systems (LLS) General principles Densit de foudroiement base sur des systmes de localisation de la foudre (LLS) Principes gnraux IEC 62858:2015-08(en-fr) THIS PUBLICATION IS COPYR
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19、 des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 62858 Edition 1.0 2015-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Lightning density based on lightning location systems (LLS) General principles Densit de foudroiement base sur des systmes de loc
20、alisation de la foudre (LLS) Principes gnraux INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS : 29.020, 91.120.40 ISBN 978-2-8322-2820-3 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Inter
21、nationale 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 agr. 2 IEC 62858:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms
22、, 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 locati
23、on system performance characteristics . 10 Bibliography 12 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
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33、ention 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.
34、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 in
35、formation 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. 4 IEC 62858:2015 IEC 2015 The committee has decided that the contents of this publication
36、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. IEC 62858:2015 IEC 2015 5 INTRODUCTION I
37、nternational 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 G , defined as the mean number of lightning flashes to ground per square kilometer per year is the primary inp
38、ut parameter to perform such an evaluation. In many areas of the world N Gis derived from data provided by lightning location systems (LLS), but no common rule exists defining requirements either for their performance or for the elaboration of the measured data. 6 IEC 62858:2015 IEC 2015 LIGHTNING D
39、ENSITY 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 Gobtained from LLS in various countries. Only parameters that are relevant to risk assessment are c
40、onsidered. 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 (includin
41、g 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
42、 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:
43、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
44、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 IEC 62858:2015
45、 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 dens
46、ity N Gmean number of cloud-to-ground flashes per unit area per unit time (flashes km 2 year 1 ) 3.1.7 ground strike-point density N SGmean number of strike-points to ground or to ground based objects per unit area per unit time (strike-points km 2 year 1 ) 3.1.8 lightning sensor device that measure
47、s 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 systems coverage Note 1 to entry: This note applies to the French language only. 3.1.10 confi
48、dence 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
49、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 m
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