Cable Insulation Thermal Life Studies

摘要

In the thermal rating of magnet wires, the rate concept is taken into consideration. The thermal rating is based upon a 20,000 hour extrapolated life for magnet wires. With such a thermal-life rating it is possible to explore mechanisms of degradation of polymer insulation and at the same time upgrade polymeric insulation materials in thermal-life rating. Using a similar system of thermal-life rating which is summarized in Table I and Figure 1, (Ref. 1 and 2), thermal-life ratings may be determined for cables and wire. In some cases a thermal life rating will not be obtained in an expected temperature range. This may be indicative of a material incompatability such as an adhesive failure in a tape system. Such modifications in cable construction as paper separators can lead to a reduction in thermal-life rating. Topics included are: The thermal rating of H-film; The thermal-life rating of teflon; The thermal-life rating of ethylene propylene wires; Cut through on H-film data.