1、 IEC 61251 Edition 1.0 2015-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulating materials and systems AC voltage endurance evaluation Systmes et matriaux isolants lectriques valuation de lendurance la tension alternative IEC 61251:2015-11(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECT
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19、aires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61251 Edition 1.0 2015-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulating materials and systems AC voltage endurance evaluation Systmes et matriaux isolants lectriques valuation de lendurance l
20、a tension alternative INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 17.220.99; 29.035.01 ISBN 978-2-8322-2990-3 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make
21、 sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 61251:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms, definitions and symbo
22、ls 6 3.1 Terms and definitions 6 3.2 Symbols 7 4 Voltage endurance 7 4.1 Voltage endurance testing 7 4.2 Electrical stress 7 4.3 Voltage endurance (VE) graph 8 4.4 Short-time electric strength . 8 4.5 Voltage endurance coefficient (VEC) . 9 4.6 Differential VEC (n d ) . 9 4.7 Electrical threshold st
23、ress (E t ) 9 4.8 Voltage endurance relationship . 10 5 Test methods . 11 5.1 Introductory remarks . 11 5.2 Tests at constant stress 11 5.2.1 Conventional VE test . 11 5.2.2 Diagnostic measurements 12 5.2.3 Detection of an electrical threshold 12 5.3 Tests at higher frequency 12 5.4 Progressive stre
24、ss tests 13 5.5 Preliminary tests to determine the initial part of the VE line . 15 5.6 Recommended test procedure 15 6 Evaluation of voltage endurance 15 6.1 Significance of the VEC 15 6.2 Significance of the electrical threshold stress 16 6.3 Dispersion of data and precision requirements 16 6.4 Pr
25、esentation of the results 16 Annex A (informative) The Weibull distribution . 18 A.1 Weibull distribution times to dielectric breakdown . 18 A.2 Weibull distribution dielectric breakdown stresses . 18 A.3 Generalized Weibull distribution of the dielectric breakdown stresses . 18 A.4 Inverse power mo
26、del for the time to dielectric breakdown . 19 Bibliography 20 Figure 1 General voltage endurance line 8 Figure 2 Determination of the differential VEC n dat a generic point P of the VE line 9 Figure 3 Plotting the VE line in a progressive stress test using different rates of stress rise . 14 IEC 612
27、51:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATING MATERIALS AND SYSTEMS AC VOLTAGE ENDURANCE EVALUATION FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committe
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38、ent rights. International Standard IEC 61251 has been prepared by IEC technical committee 112: Evaluation and qualification of electrical insulating materials and systems. This first edition of IEC 61251 cancels and replaces the second edition of IEC TS 61251, published in 2008. This edition constit
39、utes a technical revision. This edition includes the following significant technical changes with respect to the second edition of IEC TS 61251: a) upgrade from Technical Specification to an International Standard; b) clarification of issues raised since publication of IEC TS 61251. 4 IEC 61251:2015
40、 IEC 2015 The text of this standard is based on the following documents: FDIS Report on voting 112/338/FDIS 112/347/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance
41、with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconf
42、irmed, withdrawn, replaced by a revised edition, or amended. IEC 61251:2015 IEC 2015 5 INTRODUCTION This International Standard covers insulating materials and systems. Voltage endurance tests are used to compare and evaluate insulating materials and systems. It is complex to determine the capabilit
43、y of electrical insulating materials and systems to endure a.c. voltage stress. The results of voltage endurance tests are influenced by many factors. Therefore this International Standard can be considered as an attempt to present a unified view of voltage endurance for simplified planning and anal
44、ysis. 6 IEC 61251:2015 IEC 2015 ELECTRICAL INSULATING MATERIALS AND SYSTEMS AC VOLTAGE ENDURANCE EVALUATION 1 Scope This International Standard describes many of the factors involved in voltage endurance tests on electrical insulating materials and systems. It describes the voltage endurance graph,
45、lists test methods illustrating their limitations and gives guidance for evaluating the sinusoidal a.c. voltage endurance of insulating materials and systems from the results of the tests. This International Standard is applicable over the voltage frequency range 20 Hz to 1 000 Hz. The general princ
46、iples can also be applicable to other voltage shapes, including impulse voltages. The terminology to be used in voltage endurance is defined and explained. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its a
47、pplication. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62539, Guide for the statistical analysis of electrical insulation dielectric breakdown data 3 Terms, definitions and symbol
48、s 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 voltage endurance VE measures of the capability of a solid insulating material to endure voltage Note 1 to entry: In this International Standard, only a.c. voltage is considered. Note 2 to
49、 entry: This note only applies to the French language. 3.1.2 life time to dielectric breakdown 3.1.3 voltage endurance coefficient VEC numerical value of the reciprocal of the slope of a straight line log-log VE plot Note 1 to entry: This note only applies to the French language. 3.1.4 specimen representative test object for assessing the value of one or more physical properties IEC 61251:2015 IEC 2015 7 3.1.5 sample g
