UNE-EN IEC 60216-6:2023

This part of IEC 60216 specifies the experimental and calculation procedures for deriving the

thermal endurance characteristics, temperature index (TI) and relative temperature index (RTI)

of an electrical insulating material (EIM) using the fixed time frame method (FTFM) .

In this protocol, the ageing takes place for a small number of fixed times, using the appropriate

number of ageing temperatures throughout each time, the properties of the specimens being

measured at the end of the relevant time interval. This differs from the procedure of IEC 60216-

1, where ageing is conducted at a small number of fixed temperatures, property measurement

taking place after ageing times dependent on the progress of ageing.

The diagnostic tests employed in the fixed time frame method are restricted to destructive tests.

The method has not yet been applied to non-destructive or proof test procedures.

Both the TI and the RTI determined according to the FTFM protocol are derived from

experimental data obtained in accordance with the instructions of IEC 60216-1 and IEC 60216-

2 as modified in this part of IEC 60216. The calculation procedures and statistical tests are

modified from those of IEC 60216-3 and IEC 60216-5.