GB/T 11026.1-2016 in English
VALIDElectrical insulating materials--Thermal endurance properties--Part 1: Ageing procedures and evaluation of test results
- Issued on:2016-12-13
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 11026.1-2016电气绝缘材料 耐热性 第1部分：老化程序和试验结果的评定》由TC301（全国电气绝缘材料与绝缘系统评定标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Standard Overview and Technical Evolution
GB/T 11026.1-2016 is equivalent to the sixth edition of IEC 60216-1:2013, replacing the 2003 edition. The main technical changes include: deleting the simplified assessment procedure, adjusting the list of referenced documents, adding Appendix B (exposure time and temperature relationship table), etc. This standard is the basic specification for evaluating the performance changes of electrical insulation materials under thermal aging conditions.
Core Terms and Evaluation Parameters
| Terms | Definition | Calculation Formula |
|---|---|---|
| Temperature Index (TI) | Temperature value at which the material maintains its performance after 20,000 hours of aging | Arrhenius equation extrapolation |
| Half-difference (HIC) | Temperature interval at which the temperature index corresponds to half the time | θ2-θ1 |
| Heat Resistance Diagram | Relationship curve between the logarithm of the endpoint time and the reciprocal of the absolute temperature | log(t) vs 1/T |
Key requirements of the test procedure
1. Sample preparation
Number of samples per group: ≥5 for non-destructive test, ≥11 for inspection test, calculated as N=ms×as×nc+na for destructive test
2. Temperature selection
Three conditions must be met:
- Average endpoint time at the lowest temperature ≥5,000h
- Average endpoint time at the highest temperature 100-500h
- Temperature extrapolation ≤25K
Implementation suggestions and common problems
Non-linear data processing: When the F test shows non-linearity, it is recommended to:
1. Add low temperature test points
2. Eliminate abnormally high temperature data
3. Limit the extrapolation range to 15K
Confidence guarantee: The difference between TI and TC should be ≤0.6HIC, otherwise the data quality needs to be improved by increasing the number of samples or optimizing the test design.
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