BSI PD IEC/TR 60216-7-2:2016
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Electrical insulating materials. Thermal endurance properties – Results of the round robin tests to validate procedures of IEC TS 60216-7-1 by non-isothermal kinetic analysis of thermogravimetric data
| Published By | Publication Date | Number of Pages |
| BSI | 2016 | 30 |
The purpose of this part of IEC 60216 , which is a Technical Report, is to validate the procedures of IEC TS 60216‑7‑1 in providing a similar temperature index to conventional methods used in other parts of the IEC 60216 series.
These round robin test results do not provide statistical analysis for precisions. The round robin test focuses on preliminary studies to understand the evaluation and calculation procedures, influence on apparatus, and data variance among laboratories before determination of precisions.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | CONTENTS |
| 6 | FOREWORD |
| 8 | INTRODUCTION |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Test specimens |
| 11 | 5 Test apparatus 5.1 Thermogravimetric analyser (TGA) 5.2 Purge gas supplied into the TGA furnace 6 Test procedures 6.1 General Tables Table 1 – Heat ageing properties of the test specimens by the conventional procedure described in IEC 60216-5 |
| 12 | 6.2 Preconditioning of test samples 6.3 TGA tests with multiple heating rates 6.4 Calculation of the activation energy (Ea) |
| 13 | 6.5 Determination of thermal endurance using TGA 6.5.1 General 6.5.2 Determination of RTEA by given degree of conversion from reference material (Method A) Figures Figure 1 – Fitting curve of plots between degree of conversion andactivation energy determined by ISO 11358-2 (example) |
| 14 | 6.5.3 Determination of TIA by fixed degree of conversion at 0,05 (Method B) 7 Round robin test results 7.1 TGA test results 7.2 Degree of conversion correlated to the activation energy from conventional heat ageing data |
| 15 | 7.3 HICA determined by Method A and Method B Table 2 – Degree of conversion identical to the activation energyof the conventional heat ageing Table 3 – HICA determined by Method A and Method B for dielectric strength |
| 16 | 7.4 RTEA determined by Method A and TIA by Method B Table 4 – HICA determined by Method A and Method B for tensile strength Table 5 – HICA determined by Method A and Method B for impact strength |
| 17 | Table 6 – RTEA determined by Method A and TIA by Method B for dielectric strength Table 7 – RTEA determined by Method A and TIA by Method B for tensile strength |
| 18 | 7.5 Difference between RTEA and TI determined by the conventional heat ageing tests Table 8 – RTEA determined by Method A and TIA by Method B for impact strength Table 9 – Difference between RTEA or TIA, and TI for dielectric strength |
| 19 | 8 Observations from the round robin test results 8.1 General Table 10 – Difference between RTEA or TIA, and TI for tensile strength Table 11 – Difference between RTEA or TIA, and TI for impact strength |
| 20 | 8.2 Sample weight variation |
| 21 | 8.3 Humidity and hydrolysis of the sample Figure 2 – Correlation between the initial sample mass of sample A and the difference of RTEA (TIA) from TI Figure 3 – Correlation between the initial sample mass of sample B and the difference of RTEA (TIA) from TI |
| 22 | 8.4 Consideration on repeatability of TGA curves |
| 23 | 8.5 Baseline drift and responsiveness to heating rates of TGA Table 12 – Comparison of degree of conversion with original or rerun data at 8 K/min |
| 24 | Figure 4 – Overlay charts of TGA curves in multiple heating rates in multiple laboratories (enlarged) |
| 25 | Figure 5 – Logarithm plots for activation energy calculation |
| 26 | 9 Conclusion and recommendation Figure 6 – Fitting curves of degree of conversion vs. activation energy by TGA |
| 28 | Bibliography |
