EN 61251-2016 en Electrical insulating materials and systems - A C voltage endurance evaluation.pdf
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1、BSI Standards PublicationElectrical insulating materials and systems A.C. voltage endurance evaluationBS EN 61251:2016National forewordThis British Standard is the UK implementation of EN 61251:2016. It is identical to IEC 61251:2015. It supersedes DD IEC/TS 61251:2008 which is withdrawn.The UK part
2、icipation in its preparation was entrusted to TechnicalCommittee GEL/112, Evaluation and qualification of electrical insulatingmaterials and systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the n
3、ecessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 87580 9ICS 17.220.99; 29.035.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This Britis
4、h Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2016.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61251:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61251 February 2016 ICS 17.220.99; 29.035.0
5、1 English Version Electrical insulating materials and systems - A.C. voltage endurance evaluation (IEC 61251:2015) Systmes et matriaux isolants lectriques - valuation de lendurance a la tension alternative (IEC 61251:2015) Elektrische Isolierstoffe und -systeme - Ermittlung der Wechselspannungsbestn
6、digkei (IEC 61251:2015) This European Standard was approved by CENELEC on 2015-12-23. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date li
7、sts and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
8、under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark,
9、 Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Commi
10、ttee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENE
11、LEC Members. Ref. No. EN 61251:2016 E BS EN 61251:2016EN 61251:2016 2 European foreword The text of document 112/338/FDIS, future edition 1 of IEC 61251, prepared by IEC/TC 112 “Evaluation and qualification of electrical insulating materials and systems“ was submitted to the IEC-CENELEC parallel vot
12、e and approved by CENELEC as EN 61251:2016. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-09-23 latest date by which the national standards conflicting with the do
13、cument have to be withdrawn (dow) 2018-12-23 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the Intern
14、ational Standard IEC 61251:2015 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60243-1 NOTE Harmonized as EN 60243-1. IEC 60243-2 NOTE Harmonized as EN 60243-2.
15、IEC 60243-3 NOTE Harmonized as EN 60243-3. IEC 60343 NOTE Harmonized as EN 60343. IEC 61649 NOTE Harmonized as EN 61649. BS EN 61251:2016EN 61251:2016 3 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in
16、whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Public
17、ation has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 62539 - Guide for the statisti
18、cal analysis of electrical insulation breakdown data - - BS EN 61251:2016 2 IEC 61251:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms, definitions and symbols 6 3.1 Terms and definitions 6 3.2 Symbols 7 4 Voltage endurance 7 4.1 Voltage endurance testi
19、ng 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 (nd) . 9 4.7 Electrical threshold stress (Et) 9 4.8 Voltage endurance relationship . 10 5 Test methods . 11 5.1 Introductory remarks .
20、 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 stress tests 13 5.5 Preliminary tests to determine the initial part of the VE line . 15 5.6 Recommended
21、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 Presentation of the results 16 Annex A (informative) The Weibull distribution . 18 A.1 Weibull distrib
22、ution 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 model for the time to dielectric breakdown . 19 Bibliography 20 Figure 1 General voltage endurance lin
23、e 8 Figure 2 Determination of the differential VEC ndat 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 BS EN 61251:2016IEC 61251:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSULATING
24、MATERIALS AND SYSTEMS AC VOLTAGE ENDURANCE EVALUATION FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operat
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