IEC_TR_62874-2015.pdf

IEC TR 62874 Edition 1.0 2015-05 TECHNICA L REPOR T Guidance on the interpretation of carbon dioxide and 2-furfuraldehy de as markers of paper thermal degradation in insulating mineral oil IEC TR 62874:2015-05(en)Copyright International Electrotechnical Commission THIS PUBLICA TION IS COPYRIGHT PROTECTED Copyright 2015 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 infoiec.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a variety of criteria(reference number,text,technical committee,).It also gives information on projec ts,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications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 more than 30 000 terms and definitions in English and French,with equiv alent terms in 15 additional languages.Also known as the International Elec trotechnical Vocabulary (IEV)online.IEC Glossar y-st d.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 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.Copyright International Electrotechnical Commission IEC TR 62874 Edit ion 1.0 2015-05 TECHNICA L R EPOR T Guidance on the interpretation of carbon dioxide and 2-furfuraldehy de as markers of paper thermal degradation in insulating mineral oil INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.040.10 ISBN 978-2-8322-2661-2 R egist er ed tr ademar k of t he Int er national Electr ot echnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.Copyright International Electrotechnical Commission 2 IEC TR 62874:2015 IEC 2015 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Significance.8 3.1 General.8 3.2 Thermal and mechanical degradation of paper.8 3.2.1 General.8 3.2.2 Impact of temperature.8 3.2.3 Impact of humidity and oxygen.9 3.3 Symptoms of paper ageing in insulating oil.10 3.3.1 General.10 3.3.2 Volatile by-products.11 3.3.3 Soluble by-products.11 3.3.4 Insoluble by-products.11 3.4 Operational parameters influencing paper thermal ageing.11 3.5 Role of oil type and condition.12 3.6 Fault conditions that may affect thermal ageing.12 3.7 Maintenance operations that may affect thermal ageing indicators.13 3.7.1 General.13 3.7.2 Effects of oil reconditioning.13 3.7.3 Effects of oil reclamation.13 3.7.4 Effects of oil change.13 4 Monitoring protocol.14 4.1 General.14 4.2 Parameters.14 4.2.1 Basic monitoring.14 4.2.2 Complementary monitoring.14 4.3 Recommended testing frequencies.14 5 Typical values of paper ageing symptoms.15 5.1 General.15 5.2 Families of equipment.15 6 Estimation of paper thermal degradation and ageing rate.16 6.1 General approach.16 6.2 Practice.16 7 Actions.17 Annex A(informative)Typical values tables.19 A.1 General warning.19 A.2 2-FAL typical values.19 A.2.1 General.19 A.2.2 Family:GSU(generation step-up units).19 A.2.3 Family:network transmission units.20 A.2.4 Family:large distribution units.20 A.2.5 Family:industrial distribution units.20 A.2.6 Family:LVDC units.21 Copyright International Electrotechnical Commission IEC TR 62874:2015 IEC 2015 3 A.3