EN 60216-5:2008

FOREWORD
1 Scope
2 Normative references
3 Terms, definitions, symbols, units and abbreviations
  3.1 Terms, abbreviations, and definitions
  3.2 Symbols and units
  3.3 Objectives of RTE determination
4 Experimental procedures
  4.1 Selection of reference EIM
  4.2 Selection of diagnostic test for extent of ageing
  4.3 Ageing procedures
5 Calculation procedures
  5.1 Thermal endurance data - Calculation of intermediate
      parameters
  5.2 Calculation of RTE
  5.3 Statistical and numerical tests
      5.3.1 Tests of IEC 60216-3
      5.3.2 Precision of correlation time
      5.3.3 Lower confidence interval of RTE
      5.3.4 Extrapolation
6 Report
  6.1 Results of statistical and numerical tests
  6.2 Results
  6.3 Report
7 Material testing by short-term thermal ageing
8 Insulation classification
Annex A (informative) - Repeatability of correlation time
Annex B (informative) - Thermal class assignment
Annex C (informative) - Computer program
Annex D (informative) - Selection of the reference EIM
Annex ZA (normative) - Normative references to international
                       publications with their corresponding
                       European publications
Bibliography

IEC 60216-5 specifies the experimental and calculation 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 thermal 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 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, based 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. This third edition clarifies and corrects a few items and adds an Annex D which provides criteria for the selection of the reference (or reference EIM). The third edition 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).