IEC_60092-503-2007.pdf

INTERNATIONAL STANDARD IEC60092-503 Second edition2007-06 Electrical installations in ships Part 503:Special features AC supply systems with voltages in the range of above 1 kV up to and including 15 kV Reference number IEC 60092-503:2007(E)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 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to search by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,withdrawn and replaced publications.?IEC Just Published:www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.Just Published details twice a month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.?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 INTERNATIONAL STANDARD IEC60092-503 Second edition2007-06 Electrical installations in ships Part 503:Special features AC supply systems with voltages in the range of above 1 kV up to and including 15 kV R For price,see current cataloguePRICE CODE Commission Electrotechnique InternationaleInternational Electrotechnical Commission 2 60092-503 IEC:2007(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Terms and definitions.8 3.1 AC voltages.8 3.2 Earthed neutral systems.9 3.3 Insulation.9 4 General requirements.9 4.1 Voltage and frequency.9 4.2 Warning notices.10 4.3 Access.10 4.4 Insulation level.10 4.5 Clearances and creepage distances.10 4.5.1 Clearance distance.10 4.5.2 Creepage distance.10 4.6 Earthing.11 4.7 Distribution systems.12 4.7.1 Divided system.12 4.7.2 Auxiliary circuits.12 4.7.3 Busbars of main switchboards.12 4.7.4 Generator circuits.13 4.7.5 Outgoing circuits.13 4.7.6 Power-transformer circuits.13 4.7.7 Shore-connection circuits and circuits to other units.13 4.7.8 Control and instrumentation circuits.13 4.8 Generator and transformer neutrals.13 4.8.1 Generator neutrals interconnected.13 4.8.2 Disconnection.14 4.9 Electrical protection.14 4.9.1 General.14 4.9.2 Generator protection.14 4.9.3 Motor protection.14 4.9.4 Power-transformer protection.14 4.9.5 Voltage-transformer protection.14 4.9.6 Overvoltage protection.14 4.9.7 Earth-fault monitoring.14 5 Equipment.15 5.1 AC generators and motors.15 5.1.1 Enclosures.15 5.1.2 Performance.15 5.1.3 De-excitation.16 5.1.4 Mechanical characteristics.16 5.2 Transformers.16 5.2.1 Enclosures and installations.16 60092-503 IEC:2007(E)3 5.2.2 Accumulation of moisture and condensation.16 5.2.3 Transient voltage conditions.17 5.2.4 Current inrush.17 5.3 Switchgear and controlgear assemblies(switchboards).17 5.3.1 Design and construction.17 5.3.2 Passageways.18 5.4 Switchgear and controlgear and fuses.18 5.5 Cables.18 5.5.1 General.18 5.5.2 Installation.18 5.5.3 Conductors and terminations.18 5.5.4 Current rating.19 5.5.5 Testing.19 5.5.6 Socket-outlets.19 Table 1 AC three-phase systems having a nominal voltage above 1 kV and up to and including 15 kV.9 Table 2 Minimum clearance for equipment.10 Table 3 Minimum creepage distances for main switchboards and generators.11 Table 4 Minimum creepage distances for other equipment.11 4 60092-503 IEC:2007(E)INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSTALLATIONS IN SHIPS Part 503:Special features AC supply systems with voltages in the range of above 1 kV up to and including 15 kV FOREWORD 1)The International Electrotechnical Commission(IEC)is a worldwide organization for standardization comprising all national electrotechnical committees(IEC National Committees).The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields.To this end and in addition to other activities,IEC publishe