IEC_TS_61463-2016.pdf

IEC TS 61463 Edition 2.0 2016-07 TECHNICAL SPECIFICATION Bushings Seismic qualification IEC TS 61463:2016-07(en)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 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by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications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 20 000 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 65 000 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 61463 Edition 2.0 2016-07 TECHNICAL SPECIFICATION Bushings Seismic qualification INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.080.20 ISBN 978-2-8322-3518-8 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.2 IEC TS 61463:2016 IEC 2016 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Terms and definitions.7 4 Symbols and abbreviated terms.8 5 Methods of seismic qualification.9 6 Severities.10 6.1 At the ground.10 6.2 At the bushing flange.10 7 Qualification by static calculation.11 8 Qualification by dynamic analysis.13 8.1 General.13 8.2 Modal analysis using the time-history method.14 8.3 Modal analysis using the RRS.14 9 Qualification by vibration test.14 9.1 General.14 9.1.1 General.14 9.1.2 Mounting.15 9.1.3 External load.15 9.1.4 Measurements.15 9.1.5 Standard frequency range.15 9.1.6 Test methods.15 9.1.7 Testing.17 9.2 Test on complete apparatus.18 9.3 Test on the bushing mounted on a simulating support.18 9.4 Test on the bushing alone.18 10 Evaluation of the seismic qualification.18 10.1 Combination of stresses.18 10.2 Cantilever test.19 10.3 Acceptance criteria.19 11 Necessary exchange of information.20 11.1 Information supplied by the apparatus manufacturer.20 11.2 Information supplied by the bushing manufacturer.20 Annex A(informative)Flow chart for seismic qualification.23 Annex B(informative)Natural frequency and damping determination:Free oscillation test.24 B.1 Free oscillation test.24 B.2 Sine sweep frequency search.25 Annex C(informative)Static calculation method Additional considerations.26 C.1 General.26 C.2 Effect of the first bending mode.26 C.3 Determination of Sc.26 C.4 Value of abg.26 C.5 Typical seismic response of cantilever type structures.27 IEC TS 61463:2016 IEC 2016 3 C.6 Superelevation factor K.29 Annex D(informative)Qualification by static calculation Example on transformer bushing.33 D.1 Seismic ground motion.33 D.2 Critical part of the bushing.33 D.3 Static calculation.33 D.3.1 General.33 D.3.2 Seismic load.34 D.3.3 Wind load.35 D.3.4 Terminal load.35 D.4 Guaranteed bending strength.36 Annex E(informative)Center clamped bushings.37 Bibliography.40 Figure 1 Example of model of the t