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BS EN IEC 60216-6:2022:2023 Edition

BS EN IEC 60216-6:2022:2023 Edition

$198.66

Electrical insulating materials. Thermal endurance properties – Determination of thermal endurance indices (TI and RTI) of an insulating material using the fixed time frame method

Published By Publication Date Number of Pages
BSI 2023 62
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This part of IEC 60216 specifies the experimental and calculation procedures for deriving the thermal endurance characteristics, temperature index (TI) and relative temperature index (RTI) of an electrical insulating material (EIM) using the “fixed time frame method (FTFM)”. In this protocol, the ageing takes place for a small number of fixed times, using the appropriate number of ageing 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 dependent on the progress of ageing. The diagnostic tests employed in the fixed time frame method are restricted to destructive tests. The method has not yet been applied to non-destructive or proof test procedures. Both the TI and the RTI determined according to the FTFM protocol are derived from experimental data obtained in accordance with the instructions of IEC 60216-1 and IEC 60216-2 as modified in this part of IEC 60216. The calculation procedures and statistical tests are modified from those of IEC 60216-3 and IEC 60216-5.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
9 English
CONTENTS
12 FOREWORD
14 1 Scope
2 Normative references
15 3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
18 3.2 Symbols and abbreviated terms
19 4 FTFM protocol
4.1 Principles of FTFM protocol
4.2 Objective of FTFM protocol
20 5 TI determination
5.1 Ageing procedures
5.2 Ageing times and temperatures
5.3 Test specimens
5.3.1 Preparation
21 5.3.2 Number of specimens
5.4 Diagnostic tests
22 5.5 Selection of end-points
5.6 Establishment of initial property value
5.7 Ageing conditions
5.7.1 Ageing ovens
5.7.2 Environmental conditions
23 5.7.3 Conditions for property measurement
5.8 Procedure for ageing
6 Calculation procedures
6.1 General principles
6.1.1 Thermal endurance calculation
24 6.1.2 Property value ā€“ equivalent temperature transform(Calculation of hypothetical ageing temperature derived from the value of a property)
6.2 Precision of calculations
6.3 Derivation of temperatures equivalent to property values
6.3.1 General
6.3.2 Preliminary calculations
25 6.3.3 Regression calculations (property on temperature)
27 6.3.4 Linearity test
28 6.3.5 Estimation of end-point temperatures equivalent to property values
6.4 Regression analysis (temperature on time)
6.4.1 General
6.4.2 Group means and variances
6.4.3 General means and variances
29 6.4.4 Regression
30 6.5 Statistical tests
6.5.1 Variance equality test
31 6.5.2 Linearity test (F-test)
6.5.3 Estimates of x and y and their confidence limits
33 6.6 Thermal endurance graph
7 Calculation and requirements for results
7.1 Calculation of thermal endurance characteristics
34 7.2 Reporting of results
7.2.1 Summary of statistical tests and reporting
7.2.2 Report format
8 Report
35 9 RTI determination
10 Additional symbols
36 11 Experimental procedures
11.1 Selection of reference EIM
11.2 Selection of diagnostic test for extent of ageing
11.3 Ageing procedures
12 Calculation procedures
12.1 General principles
12.2 Input data
37 12.3 RTI
Tables
Table 1 ā€“ Intermediate data values
38 12.4 Confidence limits
39 12.5 Extrapolation
40 13 Results and report
13.1 Results of statistical and numerical tests
13.2 Result
13.3 Report
41 Annexes
Annex A (normative) Decision flow chart
42 Figures
Figure A.1 ā€“ Decision flow chart
43 Annex B (normative) Decision table
Table B.1 ā€“ Decision table
44 Annex C (informative) Statistical tables
Table C.1 ā€“ Ļ‡ 2-function
Table C.2 ā€“ t-function
45 Table C.3 ā€“ F-function, P = 0,05
46 Table C.4 ā€“ F-function, P = 0,005
48 Annex D (informative) Suggested ageing times and temperatures
D.1 TI determination
D.1.1 Correlation time (TI) = 20 000 h
D.1.2 Other correlation times for TI calculation (see 12.3)
Table D.1 ā€“ Ageing temperatures and times
49 D.2 RTI determination
50 Annex E (informative) Figures
Figure E.1 ā€“ Property-temperature graph with regression line
Figure E.2 ā€“ Thermal endurance graph
51 Figure E.3 ā€“ Ageing times and temperatures in relation to thermal endurance graph
Figure E.4 ā€“ Ageing times and temperatures in relation to thermal endurance graph
52 Figure E.5 ā€“ Ageing times and temperatures in relation to thermal endurance graph
53 Annex F (normative) Statistical significance of the difference between two regression estimates
54 Annex G (informative) Computer program
G.1 General
G.1.1 Overview
55 G.1.2 Convenience program execution
56 G.2 Data files
Figure G.1 ā€“ Shortcut property dialog for program launch
57 G.2.1 Content of file Control6.ftd
59 G.2.2 Report
61 G.2.3 Thermal endurance graph
Figure G.2 ā€“ Thermal endurance graph

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