ABSTRACT
Polymeric materials are becoming increasingly popular in high-voltage systems because of their superior dielectric properties over conventional oil–paper insulation systems. However, condition monitoring and insulation diagnosis of polymeric insulation is still a critical issue. In this paper, Polarization–Depolarization Current (PDC) measurements, a popular method for condition monitoring of oil–paper insulation, is applied on different polymeric materials. An experimental setup was developed in the laboratory for this purpose. It was observed that the PDC measurements are highly dependent on material properties. The effect of temperature on polarization and depolarization processes was also studied and it was found that these processes are very sensitive to temperature. However, the degree of temperature dependence was different for different materials.
