Effects of temperature on electrical treeing and partial discharges in epoxy/silica nanocomposites
Shin Nakamura, Akiko Kumada, Kunihiko Hidaka, H. Hirai, Takahiro Imai, Takahiro Nakamura, Tetsuo Yoshimitsu
Abstract
This article reports the effect of temperature on tree propagation and phase resolved partial discharge (PRPD) pattern in epoxy/silica nanocomposite. The results show that tree shapes in 0-wt% and 5-wt% samples change from branch-like to bush-like as temperature rises. The tensile stress tends to decrease when the temperature is high, and a tree can select numerous paths to propagate; however, tree shapes in 10-wt% samples keep bush-like regardless of the temperature. It is suggested that nano-particle effect of inhibiting trees is more likely to occur at high temperatures rather than at room temperature. When a tree starts to propagate, the PRPD pattern tends to form wing-like one regardless of the amount of nano-particle and the temperature.