BS EN 60216-6-2006 Electrical insulating materials - Thermal endurance properties - Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixe.pdf

1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58properties Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating materia

2、l using the fixed time frame methodThe European Standard EN 60216-6:2006 has the status of a British StandardICS 17.220.99; 29.035.01Electrical insulating materials Thermal endurance BRITISH STANDARDBS EN 60216-6:2006BS EN 60216-6:2006This British Standard was published under the authority of the St

3、andards Policy and Strategy Committee on 29 December 2006 BSI 2006ISBN 0 580 49815 8Amendments issued since publicationAmd. No. Date Commentsits secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compli

4、ance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of EN 60216-6:2006. It is identical with IEC 60216-6:2006. It supersedes BS EN 60216-6:2004 which is withdrawn.The UK participation in i

5、ts preparation was entrusted to Technical Committee GEL/112, Evaluation and qualification of electrical insulating materials and systems.A list of organizations represented on GEL/112 can be obtained on request to EUROPEAN STANDARD EN 60216-6 NORME EUROPENNE EUROPISCHE NORM November 2006 CENELEC Eur

6、opean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide f

7、or CENELEC members. Ref. No. EN 60216-6:2006 E ICS 17.220.99; 29.035.01 Supersedes EN 60216-6:2004English version Electrical insulating materials - Thermal endurance properties Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixed time frame method

8、 (IEC 60216-6:2006) Matriaux isolants lectriques - Proprits dendurance thermique Partie 6: Dtermination des indices dendurance thermique (TI et RTE) dun matriau isolant en utilisant la mthode de “trame de dures fixes (fixed time frame)“ (CEI 60216-6:2006) Elektroisolierstoffe - Eigenschaften hinsich

9、tlich des thermischen Langzeitverhaltens Teil 6: Bestimmung der thermischen Langzeitkennwerte (TI und RTE) eines Isolierstoffes unter Anwendung des Festzeitrahmenverfahrens (IEC 60216-6:2006) This European Standard was approved by CENELEC on 2006-09-01. CENELEC members are bound to comply with the C

10、EN/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 application to the Central Secretariat or t

11、o 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 has the same status as the official

12、 versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slo

13、vakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 112/28/FDIS, future edition 2 of IEC 60216-6, prepared by IEC TC 112, Evaluation and qualification of electrical insulating materials and systems, was submitted to the IEC-CENELEC parallel vote and was

14、approved by CENELEC as EN 60216-6 on 2006-09-01. This European Standard supersedes EN 60216-6:2004. The significant technical change with respect to EN 60216-6:2004 is as follows: EN 60216-6:2006 has been supplemented by Annex G and the corresponding software. The following dates were fixed: latest

15、date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2007-06-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-09-01 Annex ZA has been added by CENELEC. _ Endorsement

16、 notice The text of the International Standard IEC 60216-6:2006 was approved by CENELEC as a European Standard without any modification. _ EN 60216-6:2006 2 3 EN 60216-6:2006 CONTENTS 1 Scope . H5 2 Normative references H5 3 Terms, definitions, symbols and abbreviated terms. H6 3.1 Terms, abbreviati

17、ons and definitions . H6 3.2 Symbols and abbreviated terms H9 4 FTFM protocol. H10 4.1 Principles and objectives H10 5 TI determination H11 5.1 Ageing procedures H11 5.2 Ageing times and temperatures. H11 5.3 Test specimens H12 5.4 Diagnostic tests H13 5.5 Selection of end-points . H13 5.6 Establish

18、ment of initial property value . H14 5.7 Ageing conditions . H14 5.8 Procedure for ageing H14 6 Calculation procedures H15 6.1 General principles H15 6.2 Precision of calculations . H16 6.3 Derivation of temperatures equivalent to property values. H16 6.4 Regression analysis (temperature on time) H1

19、9 6.5 Statistical tests. H21 6.6 Thermal endurance graph . H23 7 Calculation and requirements for results H23 7.1 Calculation of thermal endurance characteristics. H23 7.2 Reporting of results H24 8 Report. H24 9 RTE determination. H25 9.1 Objectives of RTE determination. H25 10 Additional symbols.

20、H25 11 Experimental procedures . H26 11.1 Selection of control material H26 11.2 Selection of diagnostic test for extent of ageing. H26 11.3 Ageing procedures H26 12 Calculation procedures H26 12.1 General principles H26 12.2 Input data. H27 12.3 RTE . H27 12.4 Confidence limits H27 12.5 Extrapolati

21、on H29 EN 60216-6:2006 4 13 Results and report . H29 13.1 Results of statistical and numerical tests. H29 13.2 Result H29 13.3 Report H30 Annex A (normative) Decision flow chart . H31 Annex B (normative) Decision table. H32 Annex C (informative) Statistical tables . H33 Annex D (informative) Suggest

22、ed ageing times and temperatures H36 Annex E (informative) Figures . H38 Annex F (normative) Statistical significance of the difference between two regression estimates. H41 Annex G (informative) Computer programs for IEC 60216-6. H42 HFigure E.1 Property-temperature graph with regression line. H38

23、HFigure E.2 Thermal endurance graph H38 HFigure E.3 Ageing times and temperatures in relation to thermal endurance graph . H39 HFigure E.4 Ageing times and temperatures in relation to thermal endurance graph . H39 HFigure E.5 Ageing times and temperatures in relation to thermal endurance graph . H40

24、 HFigure G.1 Thermal endurance graph H47 HTable B.1 Decision table . H32 HTable C.1 2-Function. H33 HTable C.2 tFunction . H33 HTable C.3 F-function, P = 0,05 H34 HTable C.4 F-function, P = 0,005 H35 Annex ZA (normative) Normative references to international publications with their corresponding Eur

25、opean publications. 49 5 EN 60216-6:2006 ELECTRICAL INSULATING MATERIALS THERMAL ENDURANCE PROPERTIES Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixed time frame method 1 Scope This part of IEC 60216 specifies the experimental and calculation

26、procedures for deriving the thermal endurance characteristics, temperature index (TI) and relative thermal endurance index (RTE) of a material using the “fixed time frame method (FTFM)”. In this protocol, the ageing takes place for a small number of fixed times, using the appro-priate number of agei

27、ng temperatures throughout each time, the properties of the specimens being measured at the end of the relevant time interval. This differs from the procedure of IEC 60216-1, where ageing is conducted at a small number of fixed temperatures, property measurement taking place after ageing times depen

28、dent on the progress of ageing. The diagnostic tests employed in the fixed time frame method are restricted to destructive tests. The method has not as yet been applied to non-destructive or proof test procedures. Both the TI and the RTE determined according to the FTFM protocol are derived from exp

29、erimental data obtained in accordance with the instructions of IEC 60216-1 and IEC 60216-2 as modified in this standard. The calculation procedures and statistical tests are modified from those of IEC 60216-3 and IEC 60216-5. 2 Normative references The following referenced documents are indispensabl

30、e 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 60212, Standard conditions for use prior to and during the testing of solid electrical insulatin

31、g materials IEC 60216-1:2001, Electrical insulating materials Properties of thermal endurance Part 1: Ageing procedures and evaluation of test results IEC 60216-2, Electrical insulating materials Thermal endurance properties Part 2: Determination of thermal endurance properties of electrical insulat

32、ing materials Choice of test criteria IEC 60216-3:2002, Electrical insulating materials Thermal endurance properties Part 3: Instructions for calculating thermal endurance characteristics EN 60216-6:2006 6 IEC 60216-4-1, Electrical insulating materials Thermal endurance properties Part 4-1: Ageing o

33、vens Single-chamber ovens IEC 60216-4-2, Electrical insulating materials Thermal endurance properties Part 4-2: Ageing ovens Precision ovens for use up to 300 C IEC 60216-4-3, Electrical insulating materials Thermal endurance properties Part 4-3: Ageing ovens Multi-chamber ovens IEC 60216-5, Electri

34、cal insulating materials Thermal endurance properties Part 5: Determination of relative thermal endurance index (RTE) of an insulating material 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,

35、definitions, symbols and abbreviated terms For the purposes of this document, the following terms, definitions, symbols and abbreviations apply. 3.1 Terms, abbreviations and definitions 3.1.1 assessed thermal endurance index ATE numerical value of the temperature in degrees Celsius, up to which the

36、control material possesses known, satisfactory service performance in the specified application NOTE 1 The ATE of a specific material may vary between different applications of the material. NOTE 2 ATE is sometimes referred to as “absolute” thermal endurance index. 3.1.2 ageing temperature temperatu

37、re in degrees Celsius at which a group of specimens is thermally aged 3.1.3 end-point temperature temperature in degrees Celsius at which a specimen is considered to have reached end-point after ageing for a specified time 3.1.4 candidate material material for which an estimate of the thermal endura

38、nce is required to be determined NOTE The determination is made by simultaneous thermal ageing of the material and a control material. 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 da

39、ta in the group 7 EN 60216-6:2006 3.1.6 95 % confidence limit statistical parameter, calculated from test data, which with 95 % confidence constitutes an upper or lower limit for the true value of a quantity estimated by statistical analysis NOTE 1 This implies that there is only 5 % probability tha

40、t the true value of the quantity estimated is actually larger (or smaller) than the upper (or lower) confidence limit. NOTE 2 In other connections, confidence values other than 95 % may sometimes be used, e.g. in the linearity test for destructive test data. 3.1.7 control material material with know

41、n assessed thermal endurance index (ATE), preferably derived from service experience, used as a reference for comparative tests with the candidate material 3.1.8 correlation coefficient number expressing the completeness of the relation between members of two data sets, equal to the covariance divid

42、ed by the square root of the product of the variances of the sets NOTE 1 The value of its square is between 0 (no correlation) and 1 (complete correlation). NOTE 2 In this standard, the two data sets are the values of the independent variable and the means of the corresponding dependent variable gro

43、ups. 3.1.9 correlation time (RTE) estimated time to end-point of the control material at a temperature equal to its ATE in degrees Celsius 3.1.10 correlation time (TI) hypothetical time to end-point used to calculate TI NOTE Its usual value is 20 000 h. 3.1.11 covariance (of data sets) for two sets

44、of data with equal numbers of elements where each element in one set corresponds to one in the other, sum of the products of the deviations of the corresponding members from their set means, divided by the number of degrees of freedom 3.1.12 degrees of freedom number of data values minus the number

45、of parameter values 3.1.13 destructive test diagnostic property test, where the test specimen is irreversibly changed by the property measurement, in a way which precludes a repeated measurement on the same specimen NOTE An example of a destructive test is measurement of electric strength. An exampl

46、e of a non-destructive test is measurement of tg . 3.1.14 end-point line line parallel to the temperature axis intercepting the property axis at the end-point value EN 60216-6:2006 8 3.1.15 halving interval HIC numerical value of the temperature interval in kelvins which expresses the halving of the

47、 time to end-point taken at a time equal to TI 3.1.16 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 deviations of members of one of the groups from the line 3.1.17 regression coefficie

48、nts coefficients of the equation of the best fit line derived by regression analysis 3.1.18 relative thermal endurance index RTE estimate of the thermal endurance of a candidate material, made by thermal ageing simultaneously with the control material, as described in this standard NOTE The value of

49、 RTE is the value of the temperature in degrees Celsius at which the estimated time to end-point of the candidate material is the same as the estimated time to end-point of the control material at a temperature equal to its ATE. 3.1.19 significance probability of a value of a statistical function greater than a specified value NOTE The value is equal to (1p