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10、e 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 the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
11、 International Standard IEC 60216-3 has been prepared by IEC technical committee 112: Evaluation and qualification of electrical insulating materials and systems 1 . This second edition of IEC 60216-3 cancels and replaces the first edition, published in 2002, and constitutes a technical revision. Th
12、e major technical changes with regard to the first edition concern an updating of Table C.2. In addition, the scope has been extended to cover a greater range of data characteristics, particularly with regard to incomplete data, as often obtained from proof test criteria. The greater flexibility of
13、use should lead to more efficient employment of the time available for ageing purposes. Finally, the procedures specified in this part of IEC 60216 have been extensively tested and have been used to calculate results from a large body of experimental data obtained in accordance with other parts of t
14、he standard. Annex E “Computer program” has been completely reworked. 1Provisional title: IEC technical committee 112 has been formed out of a merger between subcommittee 15E and technical committee 98. 60216-3 IEC:2006(E) 5 The text of this standard is based on the following documents: FDIS Report
15、on voting 112/26/FDIS 112/29/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 with the ISO/IEC Directives, Part 2. IEC 60216 consists of the following parts, under t
16、he general title Electrical insulating materials Thermal endurance properties 2 : Part 1: Ageing procedures and evaluation of test results Part 2: Determination of thermal endurance properties of electrical insulating materials Choice of test criteria Part 3: Instructions for calculating thermal end
17、urance characteristics Part 4: Ageing ovens Part 5: Determination of relative thermal endurance index (RTE) of an insulating material Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixed time frame method NOTE This series may be extended. For revi
18、sions and new parts, see the current catalogue of IEC publications for an up-to-date list. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the sp
19、ecific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. A CD-ROM containing the computer program and data files referred to in Annex E is affixed to the back cover of this publication. A bilingual version of this publication may be
20、 issued at a later date. 2Titles of existing parts in this series will be updated at the time of their next revision. 6 60216-3 IEC:2006(E) ELECTRICAL INSULATING MATERIALS THERMAL ENDURANCE PROPERTIES Part 3: Instructions for calculating thermal endurance characteristics 1 Scope This part of IEC 602
21、16 specifies the calculation procedures to be used for deriving thermal endurance characteristics from experimental data obtained in accordance with the instructions of IEC 60216-1 and IEC 60216-2, using fixed ageing temperatures and variable ageing times. The experimental data may be obtained using
22、 non-destructive, destructive or proof tests. Data obtained from non-destructive or proof tests may be incomplete, in that measurement of times taken to reach the endpoint may have been terminated at some point after the median time but before all specimens have reached end-point. The procedures are
23、 illustrated by worked examples, and suitable computer programs are recommended to facilitate the calculations. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated referenc
24、es, the latest edition of the referenced document (including any amendments) applies. IEC 60216-1:2001, Electrical insulating materials Properties of thermal endurance Part 1: Ageing procedures and evaluation of test results IEC 60216-2:2005, Electrical insulating materials Properties of thermal end
25、urance Part 2: Determination of thermal endurance properties of electrical insulating materials Choice of test criteria IEC 60493-1:1974, Guide for the statistical analysis of ageing test data Part 1: Methods based on mean values of normally distributed test results 3 Terms, definitions, symbols and
26、 abbreviated terms 3.1 Terms and definitions For the purposes of this document, the following definitions apply. 3.1.1 ordered data group 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 1 In this st
27、andard, ascending order implies that the data is ordered in this way, the first being the smallest. NOTE 2 It has been established that the term “group” is used in the theoretical statistics literature to represent a subset of the whole data set. The group comprises those data having the same value
28、of one of the parameters of the set (e.g. ageing temperature). A group may itself comprise a number of sub-groups characterised by another parameter (e.g. time in the case of destructive tests). 60216-3 IEC:2006(E) 7 3.1.2 order-statistic each individual value in a group of ordered data is referred
29、to as an order-statistic identified by its numerical position in the sequence 3.1.3 incomplete data ordered data, where the values above and/or below defined points are not known 3.1.4 censored data incomplete data, where the number of unknown values is known. NOTE 1 If the censoring is begun above/
30、below a specified numerical value, the censoring is Type I. If above/below a specified order-statistic it is Type II This standard is concerned only with Type II. 3.1.5 degrees of freedom number of data values minus the number of parameter values 3.1.6 variance of a data group sum of the squares of
31、the deviations of the data from a reference level. NOTE 1 The reference level may be defined by one or more parameters, for example a mean value (one parameter) or a line (two parameters, slope and intercept), divided by the number of degrees of freedom 3.1.7 central second moment of a data group su
32、m of the squares of the differences between the data values and the value of the group mean, divided by the number of data in the group 3.1.8 covariance of data groups for two groups of data with equal numbers of elements where each element in one group corresponds to one in the other, the sum of th
33、e products of the deviations of the corresponding members from their group means, divided by the number of degrees of freedom 3.1.9 regression analysis process of deducing the best-fit line expressing the relation of corresponding members of two data groups by minimizing the sum of squares of deviat
34、ions of members of one of the groups from the line NOTE The parameters are referred to as the regression coefficients. 3.1.10 correlation coefficient number expressing the completeness of the relation between members of two data groups, equal to the covariance divided by the square root of the product of the variances of the groups NOTE The value of its square is between 0 (no correlation) and 1 (complete correlation). 3.1.11 end-point line line parallel to the time axis intercepting the property axis at the end-point value
