大电机定子复合绝缘材料老化的动态力学分析

对大电机定子环氧云母复合绝缘材料进行了长时间多因子应力老化,采用动态力学分析仪对不同老化阶段的复合绝缘材料进行了动态力学实验,分析了各力学参量与复合绝缘材料老化时间的关系。根据Eyring绝对反应速度理论,推导了复合绝缘材料玻璃化转变活化能的计算公式并计算了不同老化阶段复合绝缘材料的表观活化能。

DYNAMIC MECHANICAL ANALYSIS OF DEGRADATION OF ROTATING MACHINE COMPOSITE INSULATION

The long term accelerated aging test in laboratory environment has been conducted on the composite insulating materials of actual rotating coils subjected to combined stresses including electrical, thermal, mechanical vibration and thermal cycling factors under simulated conditions. The dynamic mechanical experiment of composite insulating materials has been carried out in different aging periods using Dynamic Mechanical Analyzer (DMA) and the relationship between mechanical parameters and the aging time of composite insulating materials is also analyzed in this paper. Based on the Eyring absolute reaction speed theory, a method calculating the apparent activation energy of glass transition (AAEGT) is developed, which is used to calculate the AAEGT of composite insulating materials according to its mechanical dissipation curve in different aging periods.