IEC_TS_61244-3-2005.pdf

TECHNICAL SPECIFICATION IEC TS 61244-3 Second edition2005-11 Long-term radiation ageing in polymers Part 3:Procedures for in-service monitoring of low-voltage cable materials Reference number IEC/TS 61244-3:2005(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2.Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to this publication,including its validity,is available in the IEC Catalogue of publications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication,as well as the list of publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publications The on-line catalogue on the IEC web site(www.iec.ch/searchpub)enables you to search by a variety of criteria including text searches,technical committees and date of publication.On-line information is also available on recently issued publications,withdrawn and replaced publications,as well as corrigenda.IEC Just Published This summary of recently issued publications(www.iec.ch/online_news/justpub)is also available by email.Please contact the Customer Service Centre(see below)for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.TECHNICAL SPECIFICATION IECTS 61244-3 Second edition2005-11 Long-term radiation ageing in polymers Part 3:Procedures for in-service monitoring of low-voltage cable materials PRICE CODE IEC 2005 Copyright-all rights reserved 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 the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch U For price,see current catalogueCommission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 TS 61244-3 IEC:2005(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Abbreviations.7 4 Requirements of a monitoring technique.8 5 Techniques available.8 5.1 General.8 5.2 Local tests without sampling.9 5.3 Local tests with micro-sampling.11 6 Summary.14 Bibliography.28 Figure 1 Schematic diagram showing the operating principles of the sonic velocity meter 1.16 Figure 2 Sonic velocity test results 3.17 Figure 3 Variation in IR absorbance with wavelength for PVC material and the use of first derivative to eliminate baseline shifts 1.18 Figure 4 Correlation of first derivative of IR absorbance at 1 640 nm to 1 650 nm and elongation at break for thermal ageing of PVC at 110 C 1.19 Figure 5 Schematic diagram and photographs of prototype torque tester.20 Figure 6 Elongation at break versus torque value for flame-retardant PVC cables thermally aged at 158 C 5.21 Figure 7 Elongation at break versus torque value for PVC cables exposed to sequential radiation ageing to 0,5 MGy and thermal ageing at 120 C 5.21 Figure 8 Elongation at break versus torque value for PVC cables thermally aged at 120 C 5.22 Figure 9 Correlation of tensile elongation with modulus measurements made using the modulus profiling apparatus for a CSPE jacket aged at the five indicated temperatures 6.22 Figure 10 Correlation of tensile elongation with modulus measurements made using the modulus profiling apparatus for a CP jacket aged at the three indicated temperatures(from Reference 8).23 Figure 11 Correlation of tensile elongation with modulus measurements made using the modulus profiling apparatus for a CSPE jacket aged at the four indicated combined environments 9.23 Figure 12 Correlation of tensile elongation with NMR relaxation time measurements for a CP jacket aged at the three indicated temperatures(from Reference 8).24 Figure 13 Correlation of tensile elongation with NMR relaxation time me