IEC_TS_61245-2015.pdf

IEC TS 61245 Edition 2.0 2015-03 TECHNICAL SPECIFICATION Artificial pollution tests on high-voltage ceramic and glass insulators to be used on d.c.systems IEC TS 61245:2015-03(en)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by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications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 61245 Edition 2.0 2015-03 TECHNICAL SPECIFICATION Artificial pollution tests on high-voltage ceramic and glass insulators to be used on d.c.systems INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.080.10 ISBN 978-2-8322-2546-2 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.2 IEC TS 61245:2015 IEC 2015 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.8 2 Normative references.8 3 Terms and definitions.8 4 General test requirements.11 4.1 General.11 4.2 Test methods.12 4.3 Arrangement of insulator for test.12 4.3.1 Test configuration.12 4.3.2 Insulator cleaning.12 4.4 Requirements for the test circuit.13 4.4.1 Test voltage.13 4.4.2 Atmospheric corrections.13 4.4.3 Characteristics of the measuring systems.13 4.4.4 Identification of flashover.13 5 Salt fog method.14 5.1 General information.14 5.2 Salt solution.14 5.3 Spraying system.16 5.4 Conditions before starting the test.19 5.5 Preconditioning process.19 5.6 Withstand test.20 5.7 Acceptance criteria for the withstand test.20 6 Solid layer method.20 6.1 General information.20 6.2 Main characteristics of inert materials.21 6.3 Composition of the contaminating suspension.21 6.4 Application of the pollution layer.22 6.5 Determination of the degree of pollution of the test insulator.23 6.6 Test procedure.23 6.7 Withstand test and acceptance criteria.24 Annex A(informative)Method for checking the uniformity of the layer.25 Annex B(informative)Determination of the withstand characteristics of insulators.27 B.1 General.27 B.2 Determination of the maximum withstand degree of pollution at a given test voltage.27 B.3 Determination of the maximum withstand voltage at a given degree of pollution.27 B.4 Determination of the 50%withstand voltage at a given degree of pollution.28 Annex C(informative)Additional recommendations concerning the solid layer method procedures.29 C.1 General.29 C.2 Contamination practice.29 C.3 Drying of the pollution layer.29 C.4 Checking the wetting action of the fog.29 IEC TS 61245:2015 IEC 2015 3 C.5 Checking fog uniformity for large or complex test objects.30 C.6 Fog input to the test chamber.