ANSI IEEE 930-2004 Guide for the Statistical Analysis of Electrical Insulation Breakdown Data.pdf

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1、 INTERNATIONAL STANDARD IEC62539First edition2007-07IEEE 930Guide for the statistical analysis of electrical insulation breakdown data Reference number IEC 62539(E):2007 IEEE Std 930-2004 Guide for the statistical analysis of electrical insulation breakdown data INTERNATIONAL STANDARD IEC62539First

2、edition2007-07IEEE 930Commission Electrotechnique InternationaleInternational Electrotechnical Commission THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEEE All rights reserved. IEEE is a registered trademark in the U.S. Patent any IEC National Committee interested in the subject dealt with

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9、sulating materials and systems. The text of this standard is based on the following documents: IEEE Std FDIS Report on voting 930 (2004) 112/59/FDIS 112/69A/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. The com

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30、quiries into the legal validity or scope of those patents that are brought to its attention. Published by IEC under licence from IEEE. 2004 IEEE. All rights reserved. IEC 62539:2007(E)IEEE 930-2004(E) 5 IEEE Guide for the Statistical Analysis of Electrical Insulation Breakdown Data SponsorStatistica

31、l Technical Committeeof theIEEE Dielectrics and Electrical Insulation SocietyApproved 29 March 2005American National Standards InstituteApproved 23 September 2004IEEE-SA Standards BoardAbstract: This guide describes, with examples, statistical methods to analyze times to break downand breakdown volt

32、age data obtained from electrical testing of solid insulating materials, forpurposes including characterization of the system, comparison with another insulator system, andprediction of the probability of breakdown at given times or voltages.Keywords: breakdown voltage and time, Gumbel, Lognormal di

33、stributions, statistical methods,statistical confidence limits, WeibullPublished by IEC under licence from IEEE. 2004 IEEE. All rights reserved. IEC 62539:2007(E)IEEE 930-2004(E) 6 IEEE IntroductionEndurance and strength of insulation systems and materials subjected to electrical stress may be teste

34、d usingconstant stress tests in which times to breakdown are measured for a number of test specimens, andprogressive stress tests in which breakdown voltages may be measured. In either case it will be found that adifferent result is obtained for each specimen and that, for given test conditions, the

35、 data obtained may berepresented by a statistical distribution. Failure of solid insulation can be mostly described by extreme-value statistics, such as the Weibull andGumbel distributions, but, historically, also the lognormal function has been used. Methods for determiningwhether data fit to eithe

36、r of these distributions, graphical and computer-based techniques for estimating themost likely parameters of the distributions, computer-based techniques for estimating statistical confidenceintervals, and techniques for comparing data sets and some case studies are addressed in this guide.Notice t

37、o usersErrataErrata, if any, for this and all other standards can be accessed at the following URL: http:/standards.ieee.org/reading/ieee/updates/errata/index.html. Users are encouraged to check this URL forerrata periodically.InterpretationsCurrent interpretations can be accessed at the following U

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39、any patent rights in connection therewith. The IEEE shall not be responsible for identifyingpatents or patent applications for which a license may be required to implement an IEEE standard or forconducting inquiries into the legal validity or scope of those patents that are brought to its attention.

40、This introduction in not part of IEEE Std 930-2004, IEEE Guide for the Statistical Analysis of Electrical InsulationBreakdown Data.Published by IEC under licence from IEEE. 2004 IEEE. All rights reserved. IEC 62539:2007(E)IEEE 930-2004(E) 7 GUIDE FOR THE STATISTICALANALYSIS OF ELECTRICAL INSULATIONB

41、REAKDOWN DATA1. ScopeElectrical insulation systems and materials may be tested using constant stress tests in which times to break-down are measured for a number of test specimens, and progressive stress tests in which breakdownvoltages may be measured. In either case, it will be found that a differ

42、ent result is obtained for each speci-men and that, for given test conditions, the data obtained may be represented by a statistical distribution.This guide describes, with examples, statistical methods to analyze such data.The purpose of this guide is to define statistical methods to analyze times

43、to breakdown and breakdownvoltage data obtained from electrical testing of solid insulating materials, for purposes includingcharacterization of the system, comparison with another insulator system, and prediction of the probabilityof breakdown at given times or voltages.Methods are given for analyz

44、ing complete data sets and also censored data sets in which not all the speci-mens broke down. The guide includes methods, with examples, for determining whether the data is a goodfit to the distribution, graphical and computer-based techniques for estimating the most likely parameters ofthe distrib

45、ution, computer-based techniques for estimating statistical confidence intervals, and techniquesfor comparing data sets and some case studies. The methods of analysis are fully described for the Weibulldistribution. Some methods are also presented for the Gumbel and lognormal distributions. All the

46、examplesof computer-based techniques used in this guide may be downloaded from the following web site “http:/grouper.ieee.org/groups/930/IEEEGuide.xls.” Methods to ascertain the short time withstand voltage or oper-ating voltage of an insulation system are not presented in this guide. Mathematical t

47、echniques contained inthis guide may not apply directly to the estimation of equipment life.2. ReferencesThe following publications may be used when applicable in conjunction with this guide. When the followingstandards are superseded by an approved revision, the revision shall apply.ASTM D149-97a(2

48、004) Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength ofSolid Electrical Insulating Materials at Commercial Power Frequencies.11ASTM publications are available from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken,PA 19428-2959, US

49、A (http:/www.astm.org/). Published by IEC under licence from IEEE. 2004 IEEE. All rights reserved. IEC 62539:2007(E)IEEE 930-2004(E) 8 BS 2918-2, Methods of test for electric strength of solid insulating materials.2IEC 60243 series, Electrical strength of insulating materialsTest MethodsPart 1: Tests at power frequencies.33. Steps required for analysis of breakdown data3.1 Data acquisition3.1.1 Commonly used testing techniquesThere are two commonly used breakdown tests for electrical insulation: constant stress