Influence of barium titanate (BaTiO/sub 3/) additive on space charge formation in polyethylene

Abstract

The effect of 5% Wt BaTiO/sub 3/ additive and electrode material on space charge formation and electric field distribution in low-density polyethylene (LDPE) was investigated using the thermal step technique. Space charge was formed under high-voltage direct-current (HVDC) conditions at an average field of about 28 kV/mm and a temperature of 50/spl deg/C. Results indicate that the addition of BaTiO/sub 3/ to LDPE considerably reduced the remanent space charge and electric field, and changed their distribution patterns in the doped material compared with the plain material. It is also shown that the remanent space charge and electric field in plain LDPE are dependent on the type of electrode material. The density of the remanent space charge in the sample with gold electrodes is much higher and its distribution is different, than the sample with aluminum electrodes. The remanent field distributions in the two cases are also different.<>