IEC_TS_61936-2-2015.pdf

IEC TS 61936-2 Edition 1.0 2015-03 TECHNICAL SPECIFICATION Power installations exceeding 1 kV a.c.and 1,5 kV d.c.Part 2:d.c.IEC TS 61936-2:2015-03(en)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 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 Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland 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.IEC Catalogue-webstore.iec.ch/catalogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards,Technical Specifications,Technical Reports and other documents.Available for PC,Mac OS,Android Tablets and iPad.IEC publications 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by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications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.Available online and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and French,with equivalent terms in 15 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary More than 60 000 electrotechnical terminology entries in English and French extracted from the Terms 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 Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:csciec.ch.IEC TS 61936-2 Edition 1.0 2015-03 TECHNICAL SPECIFICATION Power installations exceeding 1 kV a.c.and 1,5 kV d.c.Part 2:d.c.INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.020;29.080.01 ISBN 978-2-8322-2304-8 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinside 2 IEC TS 61936-2:2015 IEC 2015 CONTENTS FOREWORD.5 INTRODUCTION.8 1 Scope.9 2 Normative references.9 3 Terms and definitions.10 4 Fundamental requirements.12 4.1 General.12 4.1.1 General requirements.12 4.1.2 Agreements between supplier(manufacturer)and user.12 4.2 Electrical requirements.12 4.2.1 Methods of d.c.neutral point earthing.12 4.2.2 Voltage classification.13 4.2.3 Current in normal operation.13 4.2.4 Short-circuit current.13 4.2.5 Rated frequency.13 4.2.6 Corona.13 4.2.7 Electric and magnetic fields.14 4.2.8 Overvoltages.14 4.2.9 Harmonics.14 4.2.10 Galvanic separation between a.c.and d.c.systems.14 4.3 Mechanical requirements.14 4.4 Climatic and environmental conditions.14 4.4.1 General.14 4.4.2 Normal conditions.15 4.4.3 Special conditions.15 4.5 Special requirements.15 5 Insulation.15 5.1 General.15 5.2 Selection of insulation level.15 5.2.1 Consideration of methods of neutral earthing.15 5.2.2 Consideration of rated withstand voltages.15 5.3 Verification of withstand values.16 5.4 Minimum clearances of live parts.16 5.5 Minimum clearances between parts under special conditions.18 5.6 Tested connection zones.18 6 Equipment.18 6.1 General requirements.18 6.2 Specific requirements.18 6.2.1 Switching devices.18 6.2.2 Reactors.18 6.2.3 Prefabricated type-tested switchgear.19 6.2.4 Surge arresters.19 6.2.5 Capacitors.19 6.2.6 Line traps.19 6.2.7 Insulators.19 6.2.8 Insulated cables.19 IEC TS 61936-2:2015 IEC 2015 3 6.2.9 Conductors and accessories.20 6.2.10 Rotating electrical machines.20 6.2.11 Static converters.20 6.2.12 Fuses.20 6.2.13 Electrical and mechanical Interlocking.20 6.2.14 Electronic valve devices.20 6.2.15 Valve cooling system.20 7 Installations.21 7.1 General requirements.21 7.1.1 Circuit arrangement.21 7.1.2 Documentation.21 7.1.3 Transport routes.21 7.1.4 Aisles and access areas.21 7