抄録
In this paper, we report effects of quantity and diameter of filler on treeing breakdown of alumina-filled epoxy resin under a needle-plane electrode geometry. Peak of breakdown voltage in epoxy resin appears with increasing the quantity of filler in spite of filler diameter. And the filler parts that indicates the maximum breakdown voltage shift according to diameter of filler.
The results are as follows.
(1) In case of applications of positive impulse voltage, when diameter of filler in epoxy resin is 5μm, breakdown voltage shows maximum at 40 filler parts. When diameter of filler is 250μm and 500μm, it shows maximum at 30 and 20 filler parts, respectively.
(2) In case of applications of negative impulse voltage, when diameter of filler is 5μm, the breakdown voltage shows maximum at 40 filler parts. When diameter of filler is 250μm and 500μm, it shows maximum at 30 and 15 filler parts, respectively.
(3) In case of positive and of negative impulse voltage, filler parts of 5μm and 250μm in diameter, which show maximum breakdown voltage, become larger than those of 500μm in diameter.
