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The proposed paper is focused on the definition of an aging diagnostic method by an analysis of the winding behavior at high frequencies, which strongly depends on the turn-to-turn capacitances. Firstly, it is shown that the thermal aging define variations of the turn-to-turn capacitances which determine changes in winding frequency resonances at high frequencies. These frequencies variations will be used as an aging indicator. A PSpice model is used to simulate the real coil behavior and shows the variation of several high frequency resonances which can be used as indicators for AC machine preventive maintenance program.

The presented paper concerns the insulation of cables providing the link between the converters and electrical machines in aircraft. It focuses on thermal aging tests performed on cables with the analysis of the capacitance variation. The tests were conducted on samples of a three-wire shielded cable, insulated with polyimide and polytetrafluoroethylene (PTFE). This study shows that the capacitance between the conductors of a cable is correlated with the aging of its electrical insulation.