Short-Time Thermal Life Evaluation of the Rotating Machinery Insulation Systems by the EGA-GC Method

Historical review on research of kinetics in thermal analysis and thermal endurance of electrical insulating materials

“…The results were compared with those by conventional motorette test [22] using a miniaturized magnet coil in motors, and good agreement was observed [20,21]. Thus it was clearly shown that the stepwise EGA method is applicable not only to single component materials, but also to composite materials, such as practical insulating systems.…”

“…It should be noted that the stepwise EGA was applied to insulating systems, which are composites used in practical electrical machines, such as epoxide resin and mica [20,21]. The results were compared with those by conventional motorette test [22] using a miniaturized magnet coil in motors, and good agreement was observed [20,21].…”

“…However in the case of multiple concurrent reactions, the ratio of acceleration by increasing the temperature is different for the three reaction processes, because of differences in the activation energies. We must thus accelerate the reactions in the same manner, otherwise the process of thermal deterioration is changed by the acceleration, as pointed out by Toop [20]. Thus, first we should evaluate the reaction orders, m and n, by changing the partial pressures.…”