GB/T 11026.8-2014
Electrical insulating materials.Thermal endurance properties.Part 8: Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixed time frame method (English Version)

Standard No.: GB/T 11026.8-2014
Language: Chinese, Available in English version
Release Date: 2014
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 11026.8-2014

Scope: This part of GB/T 11026 presents the experimental and calculation procedures for deriving the heat resistance, temperature index (TI) and relative heat resistance index (RTE) of insulating materials using the fixed time-limit method (FTFM). According to FTFM, the aging process will take place in a small number of fixed time periods, using the appropriate aging temperature point each time, and measuring the performance of the sample at the end of the corresponding time period. This method is different from the procedures in GB/T 11026.1. The aging process of GB/T 11026.1 will be completed at a few fixed temperatures, and the performance measurement will be carried out after the aging time according to the aging process. The diagnostic tests used in FTFM are limited to destructive tests. This method is not suitable for non-destructive or confirmatory testing. According to FTFM, the TI and RTE obtained from the test data in this section comply with GB/T 11026.1 and IEC 60216-2, and amended. The calculation procedures and statistical experiments are modified from the corresponding procedures in GB/T 11026.3 and IEC 60216-5.

GB/T 11026.8-2014 Referenced Document

GB/T 10580-2003 Standard conditions for use prior to and during the testing of solid insulating materials
GB/T 11026.1-2003 Electrical insulating materials-Properties of thermal endurance-Part 1:Ageing procedures and evaluation of test results
GB/T 11026.2-2012 Electrical insulating materials.Thermal endurance properties.Part 2:Choice of test criteria
GB/T 11026.3-2006 Electrical insulating materials.Thermal endurance properties.Part 3:Instructions for calculating thermal endurance characteristics
GB/T 11026.4-2012 Electrical insulating materials.Thermal endurance properties.Part 4:Ageing ovens.Single-chamber ovens
GB/T 11026.5-2010 Electrical insulating materials.Thermal endurance properties.Part 5:Ageing ovens.Precision ovens for use up to 300℃
GB/T 11026.6-2010 Electrial insulating materials.Thermal endurance properties.Part 6:Ageing ovens.Multi-chamber ovens
GB/T 11026.7-2014 Electrical insulating materials.Thermal endurance properties.Part 7: Determination of relative thermal endurance index (RTE) of insulating material
GB/T 21223-2007 Guide for the statistical analysis of ageing test data.Methods based on mean values of normalement diatributed test results

2014 GB/T 11026.8-2014 Electrical insulating materials.Thermal endurance properties.Part 8: Determination of thermal endurance indices (TI and RTE) of an insulating material using the fixed time frame method