Influence of nano-Al2O3 on electrical properties of insulation paper under thermal aging

Composite papers (hand sheets) with 2wt% nanoAl2O3 doped and blank papers were prepared and the accelerated thermal aging test under 130^oC with oil-blank paper and oil-composed paper were performed. The main electrical parameters of paper were tested. According to corresponding data analysis, it can be concluded that the addition of nano-Al2O3 can improve the electrical properties and anti-aging ability of composite paper. The “electric double layer” structure of nanoAl2O3 can weaken the interfacial polarization and dipole polarization in composite paper, thus reducing the permittivity and dielectric loss of composite paper.