IEC IEC63438 Edition 1.02024-12 INTERNATIONAL STANDARD colour nside Railway applications - Fixed installations - Protection principles for AC and DC electrictractionpowersupplysystems IEC 63438:2024-12(en) THISPUBLICATIONIS COPYRIGHTPROTECTED Copyright@2024IEC,Geneva,Switzerland or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IEC's 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, piease contact the address below or your local IEC member National Committee for further information. IEC Secretariat Tel.: +41 22 919 02 11 3, rue de Varembe [email protected] CH-1211Geneva 20 www.iec.ch Switzerland 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. AboutIEC 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 corrigendum or an amendment might have been published. IEC publications search -webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the varietyof criteria (reference number, text, technical publications previews, graphical symbols and the glossary. committee, ..). It also gives information on projects, replaced With a subscription you wili always have access to up to date and withdrawn publications. content tailored to your needs. IEc Just Published - webstore.iec.ch/justpublished Electropedia-www.electropedia.org Stay up to date on all new IEC publications. Just Published The world's leading online dictionary on electrotechnology, details all new publications released. Available online and once containing more than 22 500 terminological entries in English a month by email. and French, with equivalent terms in 25 additional languages. Also known as the International Electrotechnical Vocabulary IECCustomerServiceCentre-webstore.iec.ch/csc (IEV) online. If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre:[email protected]. IEC IEC 63438 Edition 1.0 2024-12 INTERNATIONAL STANDARD olour nside Railway applications - Fixed installations - Protection principles for AC and DC electrictractionpowersupplysystems INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 45.060.01 ISBN 978-2-8327-0063-1 Warning! Make sure that you obtained this publication from an authorized distributor. ? Registered trade IEC63438:2024@IEC2024 - 2 - CONTENTS FOREWORD 1 Scope. .6 2 Normative references 3 Terms and definitions . 4 System to be protected.. 14 4.1 Description 14 4.2 Interfaces.... 4.2.1 Infeed.. .15 4.2.2 Rolling stock.. 15 4.2.3 Electrical installations fedbytheelectrictraction power supply system. 5 General principles ... 5.1 Objectives. .16 5.2 System requirements 17 5.2.1 General. 17 5.2.2 Protection reliability methods 18 5.2.3 Load discrimination.. 19 5.2.4 Speed of protection .. 5.2.5 Selectivity of protection. 5.2.6 Economic feasibility... 5.3 Description oftheprotectionsystem... .20 5.4 Fault and abnormal conditions .... .21 .22 5.5 Protection concept... 6 Specificrequirementsofdifferentsystems. .23 6.1 General. 6.2 AC systems.. .24 6.2.1 Power conversion infeed... .24 6.2.2 Busbar infeed .24 6.2.3 Line feeder .. 6.2.4 Switching station feeder.... ..27 6.2.5 Autotransformer. .28 6.3 DC systems .. .28 6.3.1 Power conversion infeed.. .28 6.3.2 DC busbar infeed.. .29 6.3.3 Line feeder. 6.3.4 Switching station feeder.. 6.3.5 Frame leakage protection .31 6.4 Overview ofprotection reliabilitymethods .31 7 Limitations and residual risks.. 33 8 Design verification.. AnnexA(informative)Example