IEC_60099-6ed1.0en.pdf

INTERNATIONALSTANDARDIEC60099-6First edition2002-08Surge arresters Part 6:Surge arresters containing both seriesand parallel gapped structures Rated 52 kV and lessReference numberIEC 60099-6:2002(E)Publication numberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editionsThe 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,thebase publication incorporating amendment 1 and the base publication incorporatingamendments 1 and 2.Further information on IEC publicationsThe technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating tothis publication,including its validity,is available in the IEC Catalogue ofpublications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertakenby the technical committee which has prepared this publication,as well as the listof publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publicationsThe on-line catalogue on the IEC web site(www.iec.ch/catlg-e.htm)enablesyou to search by a variety of criteria including text searches,technicalcommittees and date of publication.On-line information is also available onrecently issued publications,withdrawn and replaced publications,as well ascorrigenda.IEC Just PublishedThis summary of recently issued publications(www.iec.ch/JP.htm)is alsoavailable by email.Please contact the Customer Service Centre(see below)forfurther information.Customer Service CentreIf you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.chTel:+41 22 919 02 11Fax:+41 22 919 03 00INTERNATIONALSTANDARDIEC60099-6First edition2002-08Surge arresters Part 6:Surge arresters containing both seriesand parallel gapped structures Rated 52 kV and less IEC 2002 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,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.chXFor price,see current cataloguePRICE CODECommission Electrotechnique InternationaleInternational Electrotechnical Commission 2 60099-6 IEC:2002(E)CONTENTSFOREWORD.4INTRODUCTION.51General.61.1Scope.61.2Normative references.62Definitions.73Identification and classification.143.1Arrester identification.143.2Arrester classification.144Standard ratings.154.1Standard rated voltages.154.2Standard rated frequencies.154.3Standard nominal discharge currents.154.4Service conditions.155Requirements.165.1Insulation withstand of the arrester housing.165.2Reference voltage.165.3Impulse protective levels.165.4Partial discharges.165.5Seal leakage.165.6Thermal stability.165.7Long duration current impulse withstand.165.8Operating duty.175.9Power frequency voltage versus time characteristics of an arrester.175.10 Short-circuit withstand.185.11 Disconnectors.185.12 Requirements for internal and external grading components.185.13 Power frequency sparkover.185.14 Grading current.185.15 Weather ageing tests.186General procedures.186.1Measuring equipment and accuracy.186.2Reference voltage measurements.196.3Test samples.197Type tests(design tests).197.1General.197.2Insulation withstand tests on the arrester housing.207.3Impulse protective level tests.217.4Long duration current impulse withstand test.257.5Operating duty tests.277.6Tests of arrester disconnectors.337.7Power frequency voltage sparkover tests.357.8Moisture ingress tests.357.9Weather ageing tests.3560099-6 IEC:2002(E)3 8Routine tests and acceptance tests.368.1Routine tests.368.2Acceptance tests.36Annex A(normative)Abnormal service conditions.39Annex B(normative)Test to verify thermal equivalency between complete arresterand arrester section.40Annex C(normative)Procedure to verify the power frequency voltage versus timecharacteristics of an arrester.41Annex D(normative)Artificial pollution testing of metal-oxide surge arresterscontaining gapped structures.42Annex E(informative)Typical information given with inquiries and tenders.43Annex F(informative)Typical maximum protective levels.45Bibliography.46Figure 1 Power losses of arrester at elevated temperatures vs.time.30Table 1 Arrester classification and tests.14Table 2 Steps of rated voltages.15Table 3 Peak currents for switching impulse residual voltage tests.22Table 4 Parameters for the line discharge test(10 000 A arresters).26Table 5 Requirements for the long-duration current impulse teston 5 000 A and 2 500 A ar