Study on the electrical characteristics of nano-composite PI films under HTSAMDT operating conditions
The working environment of HTSAMDT core is completely different from that of traditional silicon steel transform-er.Traditional cellulose paper is not suitable for HTSAMDT,so it is urgent to find insulation materials suitable for liquid nitrogen environment.Polyimide(PI)film is a kind of material with excellent dielectric,mechanical,high and low temperature resistance and other properties,but there is a lack of research on its application in HTSAMDT working conditions at home and abroad.In order to fill the gap in relevant research,this paper carried out research on nano-composite PI film in HTSAMDT simulated working conditions.In this paper,nano-Al2O3and TiO2 composite PI films were prepared by in-situ polymerization method,and the filling amount of nanoparticles was 0 wt％,1 wt％,3 wt％,5 wt％,7 wt％,and the thickness was 25 μm and 50 μm.The effects of different mass fraction,thickness and working environment on surface resistivity and partial discharge field strength(PDIV)of nanocomposite PI films were studied.It was concluded that the surface resistivity and PDIV value of nanocomposite PI films are both greater than that of pure PI films,and the surface resistivity and PDIV value of 25 μm films are both greater than that of 50 μm films.The surface resistivity and PDIV values measured under liquid nitrogen condition are higher than those at normal temperature.
PI filmLiquid nitrogenNanoparticlesThicknessSurface resistivityPartial discharge field strength
NETL
NSTL
万方数据
