IEC TR 60493-2-2010 Guide for the statistical analysis of ageing test data - Part 2 Validation of procedures for statistical analysis of censored normally distr.pdf

《IEC TR 60493-2-2010 Guide for the statistical analysis of ageing test data - Part 2 Validation of procedures for statistical analysis of censored normally distr.pdf》由会员分享，可在线阅读，更多相关《IEC TR 60493-2-2010 Guide for the statistical analysis of ageing test data - Part 2 Validation of procedures for statistical analysis of censored normally distr.pdf（157页珍藏版）》请在麦多课文档分享上搜索。

1、 Access to Additional Content for IEC/TR 60493-2 Edition 1.0, Dated: 03/2010 (Click here to view the publication) This Page is not part of the original publication This page has been added by IHS as a convenience to the user in order to provide access to additional content as authorized by the Copyr

2、ight holder of this document Click the link(s) below to access the content and use normal procedures for downloading or opening the files. Executable Programs Information contained in the above is the property of the Copyright holder and all Notice of Disclaimer any IEC National Committee interested

3、 in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with c

4、onditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC

5、National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for th

6、e way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any

7、 IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformit

8、y. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members o

9、f its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any

10、 other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be

11、 the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. However, a technical committee may propose the publication of a technical report when it has collected data

12、 of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC 60493-2 which is a technical report, has been prepared by IEC technical committee 112: Evaluation and qualification of electrical insulating materials and systems. TR 60493-2

13、IEC:2010(E) 5 The text of this technical report is based on the following documents: Enquiry draft Report on voting 112/140/DTR 112/145/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. This publication has

14、 been drafted in accordance with the ISO/IEC Directives, Part 2. This publication contains attached files in the form of a CD-ROM. These files are intended to be used as a complement and do not form an integral part of the standard. A list of all parts of the IEC 60493 series, published under the ge

15、neral title Guide for the statistical analysis of ageing test data, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the s

16、pecific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 TR 60493-2 IEC:2010(E) INTRODUCTION Procedures for estimating ageing properties are described in spec

17、ific test procedures, or are covered by the general documents on test procedures for ageing tests with a specific environmental stress (e.g. temperature, radiation, partial discharges). In many cases, a certain property is determined as a function of time at different ageing stresses, and a time to

18、failure based on a chosen end-point criterion is found at each ageing stress. A plot of time to failure versus ageing stress may be used to obtain an estimate of the time to failure for similar specimens exposed to a specified stress, or to obtain an estimate of the value of stress which will cause

19、failure in a specified time. The physical and chemical laws governing the ageing phenomena may often lead to the assumption that a linear relationship exists between the property examined and the ageing time at fixed ageing stresses, or between certain mathematical functions of property and ageing t

20、ime, e.g. square root or logarithm. The relationships between property values, ageing time, ageing and ageing exposure temperature are determined by mathematical procedures known as analysis of variance, analysis of covariance and regression analysis. In some cases, the property values cannot be det

21、ermined because of time or property measurement limitations. Such data are referred to as “censored data”. The mathematical procedures are well known and accepted as valid for complete (uncensored) data. This technical report describes the work done to validate the procedures for censored data. TR 6

22、0493-2 IEC:2010(E) 7 GUIDE FOR THE STATISTICAL ANALYSIS OF AGEING TEST DATA Part 2: Validation of procedures for statistical analysis of censored normally distributed data 1 Scope This part of IEC 60493 provides an account of the work done in designing and validating the statistical procedures for o

23、perations on censored groups of normally distributed data. The relationship to similar operations on complete (uncensored) data is examined, and it is shown that “mixed” or wholly uncensored data groups may be analysed in the same way as wholly censored ones. Attention is drawn to the effect of some

24、 variation of group size and extent of censoring, as well as the effect of non-uniform data group sizes. 2 Normative references IEC 60216-3, Electrical insulating materials Thermal endurance properties Part 3: Instructions for calculating thermal endurance characteristics IEC 60216-5, Electrical ins

25、ulating materials Thermal endurance properties Part 5: Determination of relative thermal endurance index (RTE) of an insulating material IEC 60216-6, Electrical insulating materials Thermal endurance properties Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating material

26、 using the fixed time frame method IEC 60493-1, Guide for the statistical analysis of ageing test data. Part 1: Methods based on mean values of normally distributed test results 3 Terms, definitions and symbols 3.1 Definitions For the purposes of this document, the following terms and definitions ap

27、ply. 3.1.1 ordered data a set of data arranged in sequence so that in the appropriate direction through the sequence each member is greater than or equal to its predecessor. NOTE “Ascending order“ in this report implies that the data is ordered in this way, the first being the smallest. 3.1.2 order-statistic each individual value in a set of ordered data identified by its numerical position in the sequence