トリー劣化における放電発光と放電電荷

抄録

This paper describes results of the discharge luminescence and discharge magnitude measurements perfomed on the insulation matelials exposed to partial discharge. PMMA with an artifical needle shape void were used as the treeing specimens. The discharge luminescence is observed by image intensifier, and the luminous image is processed by computer.
At the same time, the discharge magnitude distribution in relation to phase angle of the applied voltage was measured by a partial discharge measuring system. The mechanism of electric treeing was discussed by not only the measuremet of the discharge pulses but also the local luminescence intensity of partial discharge.
As a result, the luminescence intensity analysis showed that the relation between tree growth length and void length when maximum luminescence intensity moved from the void area to the tree area. Both the tree growth and maximum luminescence intensity at the tree area increase with constant ratio. The discharge luminescence intensity at the tree area increases significantly depending on the discharge magnitude in the specific phase angle area in positive and negative.