Influence of nano-Al<inf>2</inf>O<inf>3</inf> on electrical properties of insulation paper under thermal aging

Composite papers (hand sheets) with 2wt% nanoAl 2 O 3 doped and blank papers were prepared and the accelerated thermal aging test under 130 ^o C 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-Al 2 O 3 can improve the electrical properties and anti-aging ability of composite paper. The "electric double layer" structure of nanoAl 2 O 3 can weaken the interfacial polarization and dipole polarization in composite paper, thus reducing the permittivity and dielectric loss of composite paper.