Application of Permittivity Functionally Graded Material to Electrical Insulation of Power Apparatus

(1)对实现全固态变电站应满足的技术要求进行调查。(2)氧化铝/环氧树脂混合料可施加离心力制备介电常数功能梯度材料。SEM图像显示，氧化铝填料的数量、密度和尺寸都是连续分级的。(3)对氧化铝颗粒的运动进行了数值模拟，并根据数值结果，分析了离心条件对离心过程的影响方式。(4)实验测试了制备的氧化铝/环氧树脂的电学性能，如介电常数曲线和放电特性，并说明了FGM在这些性能上的优势。(5)数值验证了超声波可用于制备氧化铝/环氧树脂复合材料的制备。

(1)Investigation of technical requirement to be met in order to achieve all solid substation is conducted.(2)A centrifugal force can be applied to fabricate the permittivity functionally graded materials from alumina/epoxy mixture. SEM images show that both the number density and size of alumina fillers are continuously graded.(3)Movement of an alumina particle is numerically and successfully simulated and, based on the numerical results, the way how the centrifugal conditions have influence on the centrifugal process.(4)Electrical properties of the fabricated alumina/epoxy resin such as the permittivity profiles and electrical discharge characteristics are experimentally examined, and the advantage of FGM on those properties are illustrated.(5)It is numerically demonstrated that a ultrasonic wave can be used to fabricate thin FGM from alumina/epoxy mixture.