IEC_61400-24-2010.pdf

IEC 61400-24Edition 1.0 2010-06INTERNATIONAL STANDARD Wind turbines Part 24:Lightning protection IEC 61400-24:2010(E)Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 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 3,rue de Varemb CH-1211 Geneva 20 Switzerland Email:inmailiec.ch Web:www.iec.ch About 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.?Catalogue of IEC publications:www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,withdrawn and replaced publications.?IEC Just Published:www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.Just Published details twice a month all new publications released.Available on-line and also by email.?Electropedia:www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary online.?Customer Service Centre:www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance,please visit the Customer Service Centre FAQ or contact us:Email:csciec.ch Tel.:+41 22 919 02 11 Fax:+41 22 919 03 00 Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.IEC 61400-24Edition 1.0 2010-06INTERNATIONAL STANDARD Wind turbines Part 24:Lightning protection INTERNATIONAL ELECTROTECHNICAL COMMISSION XGICS 27.180 PRICE CODEISBN 978-2-88910-969-2 Registered trademark of the International Electrotechnical Commission Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.2 61400-24 IEC:2010(E)CONTENTS FOREWORD.8 1 Scope.10 2 Normative references.10 3 Terms and definitions.12 4 Symbols and units.18 5 Abbreviations.20 6 Lightning environment for wind turbine.20 6.1 General.20 6.2 Lightning current parameters and lightning protection levels(LPL).20 7 Lightning exposure assessment.22 7.1 General.22 7.2 Assessing the frequency of lightning affecting a wind turbine.23 7.3 Assessing the risk of damage.26 7.3.1 Basic equation.26 7.3.2 Assessment of risk components due to flashes to the wind turbine(S1).27 7.3.3 Assessment of the risk component due to flashes near the wind turbine(S2).27 7.3.4 Assessment of risk components due to flashes to a service line connected to the wind turbine(S3).27 7.3.5 Assessment of risk component due to flashes near a service line connected to the wind turbine(S4).28 8 Lightning protection of subcomponents.29 8.1 General.29 8.2 Blades.29 8.2.1 General.29 8.2.2 Requirements.29 8.2.3 Verification.29 8.2.4 Protection design considerations.30 8.2.5 Test methods.32 8.3 Nacelle and other structural components.32 8.3.1 General.32 8.3.2 Hub.33 8.3.3 Spinner.33 8.3.4 Nacelle.33 8.3.5 Tower.34 8.3.6 Testing methods.34 8.4 Mechanical drive train and yaw system.34 8.4.1 General.34 8.4.2 Bearings.35 8.4.3 Hydraulic systems.35 8.4.4 Spark gaps and sliding contacts.35 8.4.5 Testing.35 8.5 Electrical low-voltage systems and electronic systems and installations.36 8.5.1 General.36 8.5.2 LEMP protection measures(LPMS).36 8.5.3 Lightning protection zones(LPZ).37 Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.61400-24 IEC:2010(E)3 8.5.4 Equipotential bonding within the wind turbine.37 8.5.5 Shielding and line routing.37 8.5.6 Coordinated SPD protection.38 8.5.7 Testing methods for system immunity tes