For deeply studying the influence of hot pressing process on the dielectric performance of aramid insulating paper

the aramid insulating paper with different hot pressing temperatures and pressures is prepared

its compactness and dielectric performance are tested

and the micro morphology analysis is performed by scanning electron microscope. The research results show that when the hot pressing temperature is within 220-260 ℃ and the pressure is within 8-16 MPa

with the increase of hot pressing temperature and pressure

the dielectric constant of the insulating paper shows overall a small rise trend due to the influence of crystallinity and pores in the paper. The AC breakdown strength

due to the influence of the pores in the paper

improves continuously with the increases of hot pressing parameters and tends to be stable. In the hot pressing period

temperature and pressure act together on the insulating paper

in which the influence of temperature on the AC breakdown strength is larger.