IEC_PAS_63108-2017.pdf

IEC PA S 63108 Edition 1.0 2017-05 PUBLICLY A V A ILA BLE SPECIFICA TION PRE-STANDARD Electrical installations in ships Primary DC distribution Sy stem design architecture IEC PA S 63108:2017-05(en)THIS PUBLICA TION IS COPYRIGHT PROTECTED Copyright 2017 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no par t of this publication may be reproduced or utilized in any for m or by any means,electronic or mechanical,including photocopying and microfilm,without per mission in writing fr om 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 r ights to this publication,please contact the address below or your local IEC member National Committee for further infor mation.IEC Centr al Office Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 inf oiec.ch Switzerland www.iec.ch About t he IEC The International Electr otechnical Commission(IEC)is the leading global organization that prepar es and publishes Inter national Standards for all electr ical,electronic and related technologies.A bout 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 cor rigenda or an amendment might have been published.IEC Cat alogue-webstore.iec.ch/cat alogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards,Technical Specifications,Technical R eports and other documents.A v ailable for PC,Mac OS,A ndroid Tablets and iPad.IEC publications search-w w w.iec.ch/searchpub The adv anced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projec ts,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.A v ailable online and also once a month by email.Elect ropedia-w w w.elect ropedia.org The worlds leading online dic tionary of elec tronic and electrical terms containing 20 000 terms and definitions in English and French,with equiv alent terms in 16 additional languages.A lso known as the International Electrotechnical Vocabulary (IEV)online.IEC Glossar y-st d.iec.ch/glossary 65 000 elec trotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries hav e been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC Customer Service Cent re-webstore.iec.ch/csc If y ou wish to giv e us y our feedback on this publication or need further assistance,please contact the Customer Serv ice Centre:csciec.ch.IEC PA S 63108 Edit ion 1.0 2017-05 PUBLICLY A V A ILA BLE SPECIFICA TION PR E-STA NDA RD Electrical installations in ships Primary DC distribution System design architecture INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 47.020.60 ISBN 978-2-8322-4400-5 R egist er ed tr ademar k of t he Int er national Electr ot echnical Commission W arning!Make sure that y ou obtained this publication from an authorized distributor.2 IEC PAS 63108:2017 IEC 2017 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Terms and definitions.8 4 General requirements.8 4.1 General.8 4.2 Acceptance of substitutes or alternatives.9 4.3 Provisions for maximum load.9 4.4 Additions and alterations.9 4.5 Environmental conditions.9 4.6 Power supply system characteristics.9 4.6.1 General.9 4.6.2 DC distribution systems limits.9 4.7 Mechanical protection.9 4.8 Enclosures.9 5 System design.10 5.1 General.10 5.2 Power quality.10 5.3 Combined AC and DC distribution systems.10 5.4 Black-out start up and start from dead ship condition.10 5.5 DC distribution systems.10 5.6 AC distribution systems.10 5.7 Shore powered charging systems.10 5.8 Short-circuit currents in combined AC and DC systems.11 5.8.1 General.11 5.8.2 Short-circuit current in DC systems.11 5.9 System studies and calculations.11 5.10 Protection.11 5.10.1 General.11 5.10.2 Fixed and variable speed AC generator protection.12 5.10.3 Battery circuits.12 5.10.4 Safety barriers for energy storage systems.12 5.10.5 Protection against electric shock.13 5.11 Protection of interconnection to shore.13 6 Sources of electrical power.13 6.1 General.13 6.2 AC power generation with variable speed.13 6.3 DC power generation with variable speed.14 6.4 Various DC power sources.14 6.5 Load sharing.14 6.6 Transient operation.14 7 Power distribution systems.14 7.1 General.14 7.2 AC distribution systems.14 7.3 DC distribution systems.14 IEC PAS 63108:2017 IEC 2017 3 7.4 DC distribution systems feeding AC distribution systems.15 8 Equipment.15 8.1 General.15 8.2 Generators.15 8.3 DC assemblies.15 8.3.1 General.15 8.3.2 Cooling.15 8.3.3 Individual circuits.16 9 Control systems.17 9.1 General.17 9.