IEC_62793-2016.pdf

IEC 62793 Edition 1.0 2016-05 INTERNATIONAL STANDARD Protection against lightning Thunderstorm warning systems IEC 62793:2016-05(en)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch A bout the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.IEC Catalogue-webstore.iec.ch/catalogue The stand-alone application for consulting the entire bibliographical infor mation on IEC Inter national Standards,Technical Specifications,Technical Reports and other documents.Available for PC,Mac OS,Andr oid Tablets and iPad.IEC publications search-www.iec.ch/searchpub The advanced search enables to find IEC publications by a variety of criter ia(r efer ence number,text,technical committee,).It also gives information on pr ojects,replaced and w ithdr awn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and also once a month by email.Electropedia-www.electropedia.org The w or lds leading online dictionary of electronic and electr ical terms containing 20 000 ter ms and definitions in English and French,w ith equivalent terms in 15 additional languages.Also k now n as the International Electr otechnical Vocabulary (IEV)online.IEC Glossary -std.iec.ch/glossary 65 000 electrotechnical ter minology entr ies in English and French extr acted from the Terms and Definitions clause of IEC publications issued since 2002.Some entr ies have been collected fr om earlier publications of IEC TC 37,77,86 and CISPR.IEC Customer Serv ice Centre-webstore.iec.ch/csc If you w ish to give us y our feedback on this publication or need further assistance,please contact the Customer Ser vice Centr e:csciec.ch.IEC 62793 Edition 1.0 2016-05 INTERNATIONAL STANDARD Protection against lightning Thunderstorm warning systems INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.020;91.120.40 ISBN 978-2-8322-3352-8 Registered trademark of the International Electrotechnical Commission Warning!Make sure that y ou obtained this publication from an authorized distributor.colourinside 2 IEC 62793:2016 IEC 2016 CONTENTS FOREWORD.5 INTRODUCTION.7 1 Scope.8 2 Normative references.9 3 Terms,definitions and abbreviations.9 3.1 Terms and definitions.9 3.2 Abbreviations.12 4 Thunderstorm phases and detectable phenomena for alarming.13 4.1 Introductory remark.13 4.2 Phase 1 Initial phase(cumulus stage).13 4.3 Phase 2 Growth phase.13 4.4 Phase 3 Mature phase.13 4.5 Phase 4 Dissipation phase.13 5 Classification of thunderstorm detection devices and their properties.14 6 Alarm method.15 6.1 General.15 6.2 Areas.16 6.2.1 Target area(TA).16 6.2.2 Surrounding area(SA).16 6.2.3 Monitoring area(MA).17 6.2.4 Coverage area(CA).17 6.3 Alarm triggering.17 6.4 Alarm information delivery.19 7 Installation and maintenance.19 8 Alarm evaluation.19 8.1 General.19 8.2 Evaluation of TWS by using lightning location data.21 8.3 Fine tuning of TWS by processing archived data.21 9 Thunderstorms warning systems application guide.21 9.1 General.21 9.2 Procedure.22 9.2.1 General.22 9.2.2 Step 1 Identification of hazardous situations.22 9.2.3 Step 2 Determination of type of loss.22 9.2.4 Step 3 Risk control.23 Annex A(informative)Overview of the lightning phenomena.25 A.1 Origin of thunderclouds and electrification.25 A.2 Lightning phenomena.25 A.3 Electric thunderstorm and lightning characte ristics useful for prevention.26 A.3.1 Electrostatic field.26 A.3.2 Electromagnetic fields.27 A.3.3 Other parameters useful in lightning detection.27 Annex B(informative)Thunderstorm detection techniques.28 B.1 Introductory remarks.28 B.2 Detection techniques and parameters to qualify a sensor.28 IEC 62793:2016 IEC 2016 3 B.2.1 General.28 B.2.2 Class A.28 B.2.3 Class B.29 B.2.4 Class C.29 B.2.5 Class D.29 B.3 Location techniques.29 B.3.1 General.29 B.3.2 Multi-sensor location techniques.29 B.3.3 Single sensor techniques.30 B.4 Thunderstorm detectors evalua