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eLibrary > PD IEC TR 60216-7-2:2024 - TC Tracked Changes. Electrical insulating materials. Thermal endurance properties - Accelerated determination of relative thermal endurance using analytical test methods (RTEA). Results of the round robin tests to validate proce >

PD IEC TR 60216-7-2:2024 - TC Tracked Changes. Electrical insulating materials. Thermal endurance properties - Accelerated determination of relative thermal endurance using analytical test methods (RTEA). Results of the round robin tests to validate proce, 2024

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PD IEC TR 60216-7-2:2024 - TC Tracked Changes. Electrical insulating materials. Thermal endurance properties - Accelerated determination of relative thermal endurance using analytical test methods (RTEA). Results of the round robin tests to validate proce, 2024

A-30398375.pdf [Go to Page]
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CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Test specimens
5 Test apparatus [Go to Page]
5.1 Thermogravimetric analyser (TGA)
5.2 Purge gas supplied into the TGA furnace
Tables [Go to Page]
Table 1 – Heat ageing properties of the test specimens by the conventional procedure described in IEC 60216-5 [4]
6 Test procedures [Go to Page]
6.1 General
6.2 Preconditioning of test samples
6.3 TGA tests with multiple heating rates
6.4 Calculation of the activation energy (Ea)
6.5 Determination of thermal endurance using TGA [Go to Page]
6.5.1 General
6.5.2 Determination of RTEA by given degree of conversion from reference material (Method A)
Figures [Go to Page]
Figure 1 – Fitting curve of plots between degree of conversion and activation energy determined by ISO 11358-2 [3] (example) [Go to Page]
6.5.3 Determination of TIA by fixed degree of conversion at 0,05 (Method B)
7 Round robin test results [Go to Page]
7.1 TGA test results
7.2 Degree of conversion correlated to the activation energy from conventional heat ageing data
7.3 HICA determined by Method A and Method B
Table 2 – Degree of conversion identical to the activation energy of the conventional heat ageing
Table 3 – HICA determined by Method A and Method B for dielectric strength
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
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
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
Table 10 – Difference between RTEA or TIA, and TI for tensile strength
Table 11 – Difference between RTEA or TIA, and TI for impact strength
8 Observations from the round robin test results [Go to Page]
8.1 General
8.2 Sample weight variation
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
8.3 Humidity and hydrolysis of the sample
8.4 Considerations on repeatability of TGA curves
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
Figure 4 – Overlay charts of TGA curves in multiple heating rates in multiple laboratories (enlarged)
Figure 5 – Logarithm plots for activation energy calculation
Figure 6 – Fitting curves of degree of conversion versus activation energy by TGA
9 Conclusion
Annex A (informative) Additional round robin studies with polybuthylene terephthalate [Go to Page]
A.1 Objectives
A.2 Test specimens
A.3 Test apparatus
Table A.1 – Heat ageing properties of the PBT test specimens by the conventional procedure in accordance with IEC 60216-5 [4]
A.4 Test procedures
A.5 Test results
Table A.2 – Degrees of conversion at the activation energy identical to that from conventional heat ageing
Table A.3 – HICA determined by Method A and Method B for dielectric strength
Table A.4 – HICA determined by Method A and Method B for tensile strength
Table A.5 – HICA determined by Method A and Method B for impact strength
Table A.6 – RTEA determined by Method A and TIA by Method B for dielectric strength
Table A.7 – RTEA determined by Method A and TIA by Method B for tensile strength
Table A.8 – RTEA determined by Method A and TIA by Method B for impact strength
Table A.9 – Difference between RTEA or TIA, and TI for dielectric strength
Table A.10 – Difference between RTEA or TIA, and TI for tensile strength
A.6 Observations
Table A.11 – Difference between RTEA or TIA, and TI for impact strength
Figure A.1 – Effect of sample amount on Ea (data provided by laboratory E)
Figure A.2 – Summary of factors affecting the TGA kinetic study for determination of RTEA and TIA
Bibliography [Go to Page]

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PD IEC TR 60216-7-2:2024 - TC Tracked Changes. Electrical insulating materials. Thermal endurance properties - Accelerated determination of relative thermal endurance using analytical test methods (RTEA). Results of the round robin tests to validate proce, 2024

⨯To continue with accurate pricing,
please select your company type below: