IEC INTERNATIONAL STANDARD 60216-3 Second edition 2006-04 HOENSERTAMUSENI HISLOCANONBANYASORELIED BY BOK SPLY BUREAU. Electrical insulating materials Thermalenduranceproperties - Part 3: Instructions for calculating thermal endurancecharacteristics IEC Referencenumber IEC 60216-3:2006(E) Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1is now referred to as IEC 60034-1. Consolidated editions The IEc is now publishing consolidated versions of its publications. For example, amendments 1 and 2. FurtherinformationonIECpublications The technical content of IEC publications is kept under constant review by the IEC, HOCENSERTAMUSEI HISLOCANIONBANYASOPLIED BY BO SLYBUREAU. 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) Catalogueof IECpublications 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 On-line information is also available on recently issued publications,withdrawn and replaced publications,as wellas corrigenda IECJustPublished This summary, of recently issued publications (www.iec.ch/online news/ justpub) is also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 SLP Customer Service Centre If you have any questions regarding this publication or need further assistance please contact the Customer Service Centre: Email: [email protected] Tel: +4122 919 02 11 Fax:+4122919 03 00 IEC INTERNATIONAL STANDARD 60216-3 Second edition 2006-04 ADYOOKSPLYBURA Electrical insulating materials Thermal endurance properties - Part 3: Ll Instructionsforcalculatingthermal endurancecharacteristics @IEC 2006 —Copyright-all rights reserved mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varembe, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: [email protected] Web: www.iec.ch X IEC PRICE CODE Commission Electrotechnique Internationale International Electrotechnical Commission MexAyHapoAHagSnekTpoTexHuyeckas KomwCCMg For price, see current catalogue 60216-3@IEC:2006(E) 2 CONTENTS FOREWORD. Scope Normative references 2 6 3 Terms,definitions, symbols and abbreviatedterms. 4 Principles of calculations 4.1 General principles. 10 4.2 Preliminary calculations... 4.3 Variance calculations .. 4.4 Statistical tests. 4.5 Results... 12 5 Requirements andrecommendations forvalid calculations. D 5.1 Requirements forexperimental data 13 5.2 Precision of calculations. 13 SONLIT Calculation procedures. 6.1 Preliminary calculations. 6.2 Main calculations.. 6.3 Statistical tests... 6.4 Thermal endurance graph 21 TION Calculation and requirements for results. 21 BA 7.1 Calculation of thermal endurance characteristics 21 7.2 Summary of statistical tests and reporting 7.3 Reporting of results. 22 8 Test report. 22 Annex A(normative) Decision flow chart. .24 Annex B (normative) Decision table. .25 Annex C(informative) Statistical tables.. .26 AnnexD(informative) Workedexamples .35 Annex E (informative) Computerprogram .42 Bibliography. .50 Figure D.1-Thermal endurance graph. .39 Figure D.2-Example 3: Property-time graph (destructive test data) Table B.1-Decisions and actions according to tests. .25 TableC.1-Coefficientsforcensoreddatacalculations .26 Table C.2 - Fractiles of the F-distribution, F(0,95 fn.fa)... .32 Table C.3 - Fractiles of the F-distribution, F(0,995 fn.fa).. .33 Table C.4 -Fract