IEC_TR_63040-2016.pdf

IEC TR 63040 Edition 1.0 2016-09 TECHNICA L R EPOR T Guidance on clearances and creepage distances in particular for distances equal to or less than 2 mm Test results of research on influencing parameters IEC T R 63040:2016-09(en)c olourinsideInternational Electrotechnical Commission THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC,Geneva,Switzerland All r ights r eserved.Unless otherwise specif ied,no par t of this publication may be reproduced or utilized in any f orm or by any means,electr onic or mechanical,including photocopying and microfilm,without permission in writing f rom 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 f or fur ther information.IEC Central Office Tel.:+41 22 919 02 11 3,r ue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzer land www.iec.ch About the IEC The Inter national Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standar ds f or all electr ical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sur e that you have the latest edition,a corrigenda or an amendment might have been published.IEC Catalogue-webstore.iec.ch/cat alogue The stand-alone application for consulting the entir e bibliographical information on IEC International Standards,Technical Specifications,Technical Reports and other documents.A vailable for PC,Mac OS,A ndroid Tablets and iPad.IEC publicat ions search-www.iec.ch/searchpub The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdraw n publications.IEC Just Published-webstore.iec.ch/just published Stay up to date on all new IEC publications.Just Published details all new publications released.A vailable online and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionar y of electronic and electrical terms containing 20 000 terms and definitions in English and French,with equivalent terms in 15 additional languages.A lso known as the International Electrotechnical Vocabular y (IEV)online.IEC Glossar y -st d.iec.ch/glossary 65 000 electrotechnical terminology entries in English and French ex tracted from the Ter ms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC Cust omer Service Centre-webst ore.iec.ch/csc If you wish to give us y our feedback on this publication or need fur ther assistance,please contact the Customer Service Centre:csciec.ch.International Electrotechnical Commission IEC TR 63040 Edition 1.0 2016-09 TECHNICA L R EPOR T Guidance on clearances and creepage distances in particular for distances equal to or less than 2 mm Test results of research on influencing parameters INTER NA TIONA L ELECTROTECHNICAL COMMISSION ICS 29.080.30 ISBN 978-2-8322-3656-7 Registered t rademark of t he Int ernational Electrot echnical Commission W arning!Make sure that you obtained this publication from an authorized distributor.c olourinsideInternational Electrotechnical Commission 2 IEC TR 63040:2016 IEC 2016 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative ref erences.7 3 Terms and def initions.7 4 Fundamental aspects and phenomena of clearance and creepage distances.9 4.1 Mutual correlation of insulation characteristics with regard to environmental conditions.9 4.2 Pollution.9 4.2.1 General.9 4.2.2 Humidity level(HL).10 4.2.3 Relation of humidity levels to macro-environment.10 4.2.4 Comparative tracking index(CTI).11 4.2.5 Flashover characteristics.11 5 Clearances and creepage distances.12 5.1 General.12 5.2 Clearances.12 5.2.1 Inf luencing criteria.12 5.2.2 Altitude.14 5.3 Creepage distances.16 5.3.1 General.16 5.3.2 Inf luencing f actors.16 5.3.3 Dimensioning of creepage distances of f unctional insulation.22 6 Additional inf ormation regarding creepage distance characteristics surf ace current over a creepage distance(minimum insulation resistance).22 7 Water adsorption test.24 7.1 Object.24 7.2 Withstand characteristics of creepage distances under high humidity.24 7.3 Recommended test method.25 7.3.1 Test specimen.25 7.3.2 Measurement of the impulse withstand voltage.25 7.3.3 Procedure f or characterization of the insulating materials.25 7.4 Def initions of the water adsorption groups.26 8 Dimensioning diagrams.28 9 Withstand voltage test f or creepage distance under humidity conditions.32 Bibliography.33 Figure 1 Clearances in air f or mutual correlation of insulation characteristics to withstand transient overvoltages up to 2000 m above sea level.14 Figure 2 Creepage dist