EN 60216-5-2008 en Electrical insulating materials - Thermal endurance properties - Part 5 Determination of relative thermal endurance index (RTE) of an insulating material《电气绝缘材料 .pdf

1、BRITISH STANDARDBS EN 60216-5:2008Electrical insulating materials Thermal endurance properties Part 5: Determination of relative thermal endurance index (RTE) of an insulating materialICS 29.035.01g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59

2、g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60216-5:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 August 2008 BSI 2008ISBN 978 0 580 58072 7National forewordThis British Stan

3、dard is the UK implementation of EN 60216-5:2008. It is identical to IEC 60216-5:2008. It supersedes BS EN 60216-5:2003 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee GEL/112, Evaluation and qualification of electrical insulating materials and systems

4、.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from

5、 legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARD EN 60216-5 NORME EUROPENNE EUROPISCHE NORM May 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische

6、 Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60216-5:2008 E ICS 19.020; 29.020; 29.035.01 Supersedes EN 60216-5:2003English version Electrical insulating

7、materials - Thermal endurance properties - Part 5: Determination of relative thermal endurance index (RTE) of an insulating material (IEC 60216-5:2008) Matriaux isolants lectriques - Proprits dendurance thermique - Partie 5: Dtermination de lindice dendurance thermique relatif (RTE) dun matriau isol

8、ant (CEI 60216-5:2008) Elektroisolierstoffe - Eigenschaften hinsichtlich des thermischen Langzeitverhaltens - Teil 5: Bestimmung des relativen thermischen Lebensdauer-Indexes (RTE) von Elektroisolierstoffen (IEC 60216-5:2008) This European Standard was approved by CENELEC on 2008-05-01. CENELEC memb

9、ers 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 lists and bibliographical references concerning such national standards may be obtained on applicati

10、on to the Central Secretariat 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 under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat h

11、as the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherl

12、ands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 112/89/FDIS, future edition 3 of IEC 60216-5, prepared by IEC TC 112, Evaluation and qualification of electrical insulating materials and systems, was submitt

13、ed to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60216-5 on 2008-05-01. This European Standard supersedes EN 60216-5:2003. EN 60216-5:2008 clarifies and corrects a few items and adds an Annex D which provides criteria for the selection of the reference (or reference EIM). EN 602

14、16-5:2008 provides instructions for deriving a provisional estimate of the temperature up to which a material may give satisfactory performance in an application (by comparative thermal ageing with a material of known performance). This standard is to be used in conjunction with EN 60216-1, EN 60216

15、-2 and EN 60216-3. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2009-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 20

16、11-05-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60216-5:2008 was approved by CENELEC as a European Standard without any modification. _ BS EN 60216-5:2008 2 CONTENTS 01 Scope.42 2H2H3 3H3H3.1 4H4H3.2 Symbols and units .5H5H6 3.3 Objectives

17、 of RTE determination .6H6H7 4 Experimental procedures7H7H7 4.1 Selection of reference EIM 8H8H7 4.2 9H9H4.3 Ageing procedures 10H10H8 5 Calculation procedures.11H11H 9 5.1 Thermal endurance data Calculation of intermediate parameters12H12H 9 5.2 Calculation of RTE 13H13H10 5.3 Statistical and numer

18、ical tests . 14H14H10 5.3.1 Tests of IEC 60216-3. 15H15H10 5.3.2 Precision of correlation time 16H16H11 5.3.3 Lower confidence interval of RTE 17H17H11 5.3.4 Extrapolation . 18H18H12 6 Report 19H19H12 6.1 Results of statistical and numerical tests . 20H20H12 6.2 Results 21H21H12 6.3 Report . 22H22H1

19、2 7 Material testing by short-term thermal ageing . 23H23H12 8 Insulation classification 24H24H13 Annex A (informative) Repeatability of correlation time 25H25H14 Annex B (informative) Thermal class assignment . 26H26H17 27H27HAnnex D (informative) Selection of the reference EIM 28H28H20 Bibliograph

20、y 29H29H22 30H30H31H31HTable 1 Input parameters for the calculations concerning RTE. 32H32H10 Table B.1 Thermal class equivalents for insulating material . 33H33H17 Table B.2 F function; p = 0,05 34H34H18 Table B.3 tfunction. 35H35H18 BS EN 60216-5:2008 3 Annex ZA (normative) Normative references to

21、 international publications with theircorresponding European publications .23Normative references .4 Terms, definitions, symbols, units and abbreviations 4 Terms, abbreviations, and definitions 5 Selection of diagnostic test for extent of ageing.8 Annex C (informative) Computer program 19 Figure 1 T

22、hermal endurance graphs.8 9 Figure 2 Unacceptable thermal endurance graphs .ELECTRICAL INSULATING MATERIALS THERMAL ENDURANCE PROPERTIES Part 5: Determination of relative thermal endurance index (RTE) of an insulating material 1 Scope This part of IEC 60216 specifies the experimental and calculation

23、 procedures to be used for deriving the relative thermal endurance index of a material from experimental data obtained in accordance with the instructions of IEC 60216-1 and IEC 60216-2. The calculation procedures are supplementary to those of IEC 60216-3. Guidance is also given for assessment of th

24、ermal ageing after a single fixed time and temperature, without extrapolation. The experimental data may in principle be obtained using destructive, non-destructive or proof tests, although destructive tests have been much more extensively employed. Data obtained from non-destructive or proof tests

25、may be “censored”, 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 (see IEC 60216-1). Guidance is given for preliminary assignment of a thermal class for an insulating material, base

26、d upon the thermal ageing performance. The calculation procedures of this standard also apply to the determination of the thermal class of an electrical insulation system when the thermal stress is the prevailing ageing factor. 2 Normative references The following referenced documents are indispensa

27、ble for the application of this document. For dated references, only the edition cited applies. For undated references, 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 p

28、rocedures and evaluation of test results IEC 60216-2, Electrical insulating materials Thermal endurance properties Part 2: Determination of thermal endurance properties of electrical insulating materials Choice of test criteria IEC 60216-3:2006, Electrical insulating materials Thermal endurance prop

29、erties Part 3: Instructions for calculating thermal endurance characteristics 3 Terms, definitions, symbols, units and abbreviations For the purposes of this document, the following terms, definitions, symbols, units and abbreviated terms apply. BS EN 60216-5:2008 4 3.1 Terms, abbreviations, and def

30、initions 3.1.1 electrical insulating material EIM solid or fluid with negligibly low electric conductivity, or a simple combination of such materials, used to separate conducting parts at different electrical potential in electrotechnical devices 3.1.2 assessed thermal endurance index ATE numerical

31、value of the temperature in degrees Celsius, up to which the reference EIM possesses known, satisfactory service performance in the specified application NOTE 1 The value of the ATE may vary between applications for the same material. NOTE 2 Sometimes referred to as “absolute” thermal endurance inde

32、x. 3.1.3 candidate EIM material for which an estimate of the thermal endurance is required to be determined NOTE The determination is made by simultaneous thermal ageing of the material and a reference EIM. 3.1.4 reference EIM material with known thermal endurance, preferably derived from service ex

33、perience, used as a reference for comparative tests with the candidate EIM 3.1.5 central second moment of a data group sum 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 3.1.6 correlation time estimated time to end

34、point of the reference EIM at a temperature equal to its assessed thermal endurance (ATE) in degrees Celsius 3.1.7 degrees of freedom number of data values minus the number of parameter values 3.1.8 standard error standard error of an estimate of the true value of a data group property is the value

35、of the standard deviation of the hypothetical sampling population of which the group property may be considered to be a member NOTE 1 For the group mean it is equal to the group standard deviation divided by the square root of the number of data in the group, and indicates the uncertainty in the tru

36、e value of the mean. NOTE 2 This standard is concerned only with means and the difference between two means (see Clause 36H36HA.2). 3.1.9 standard deviation square root of the variance of a data group or sub-group BS EN 60216-5:2008 5 3.1.10 relative thermal endurance index RTE numerical value of th

37、e temperature in degrees Celsius at which the estimated time to endpoint of the candidate EIM is the same as the estimated time to endpoint of the reference EIM at a temperature equal to its assessed thermal endurance (ATE) 3.1.11 variance of a data group sum of the squares of the deviations of the

38、data from a reference level defined by one or more parameters, divided by the number of degrees of freedom NOTE The reference level may, for example, be a mean value (1 parameter) or a line (2 parameters, in this standard, the slope and the intercept with the y axis). 3.2 Symbols and units Aa Regres

39、sion coefficient (y-intercept)of thermal endurance equation for reference EIM Ba Regression coefficient (y-intercept) of thermal endurance equation for candidate EIM Ab Regression coefficient (slope) of thermal endurance equation for reference EIM Bb Regression coefficient (slope) of thermal enduran

40、ce equation for candidate EIM X Variable for statistical analysis equal to )/(10+ Y Variable for statistical analysis equal to ln )( Ageing temperature in determination of RTE 0 Temperature on Kelvin scale equal to 0 C Time to endpoint c Estimated time to endpoint of reference EIM at a temperature e

41、qual to ATE (“correlation time”) )(A2 Central second moment of x values for reference EIM )(B2 Central second moment of x values for candidate EIM An Number of y values for reference EIM data Bn Number of y values for candidate EIM data T Students t distributed stochastic variable S Standard error o

42、f the difference of two means 2As Variance of y values for reference EIM data 2Bs Variance of y values for candidate EIM data Ax General mean of x-values for reference EIM data Bx General mean of x-values for candidate EIM data Ay General mean of y-values for reference EIM data By General mean of y-

43、values for candidate EIM data A Temperature in degrees Celsius equal to ATE B Temperature in degrees Celsius equal to RTE BS EN 60216-5:2008 6 BX x value corresponding toB AX x value corresponding to A c(B) Lower confidence limit of B c(A) Lower confidence limit of A L(B)X x value corresponding to l

44、ower confidence limit of B L(A)X x value corresponding to lower confidence limit of A B Lower confidence interval of B A Lower confidence interval of A )B(cHICHalving interval of candidate EIM at a time equal to c 2Ds Variance associated with the difference between the mean y-values for the two mate

45、rials Dn Degrees of freedom of 2Ds A, BLogarithms of the longest mean times to endpoint for materials A and B brIntermediate variable: adjusted value of b for calculation of temperature confidence interval srIntermediate variable: adjusted value of s for calculation of temperature confidence interva

46、l 3.3 Objectives of RTE determination The objectives of the determination are as follows. a) To exploit an assumed relationship between thermal endurance (with an appropriate test criterion for ageing) and service performance, and to use this to predict a value for a preliminary assessment of servic

47、e temperature of a material for which there is relatively little service experience (by comparison with a known reference EIM, see Clauses 37H37H4 and 5). NOTE In the majority of cases, this will involve extrapolation to a longer time and/or lower temperature than in the experimental data. This extr

48、apolation should be kept to a minimum by appropriate choice of ageing temperatures and times, since the uncertainty in the result increases rapidly as the extrapolation is increased. However, even when there is no extrapolation, the uncertainty is still finite, on account of the variances of the exp

49、erimental data and experimental errors. b) To improve the precision of a thermal endurance determination by reduction of systematic errors in the ageing process. If, after ageing, the results for the reference EIM are found to be significantly different from earlier experience, this may indicate changes in material or equipment. This may be investigated and possibly corrected. In any case, the simultaneous ageing of reference and candidate will at least partially compensate f