Research on Diagnosis of Dielectric Material due to Partial Discharge by Multi Discharge Detection Method

建立了局部放电测量系统，对树枝现象进行了分析。同时测量了放电量和放电率。实验结果表明：(1)放电量与发光量成正比，(2)放电量和发光量在Phi_7(40ﾟ)和Phi_17&gt；(220ﾟ)相角区最大，(3)Phi_7和Phi_1；(4)放电大小与有效瞬时电压值乘以dV/dt密切相关。(5)在Phi_3、Phi_4、Phi_5处观察到空穴处的放电发光。(6)在单树形通道或多树形通道上观察到单次放电路径。

The Partial discharge measuring system were constructed for analyzing treeing phenomena. The discharge magnitude and discharge luminescence were measured at same time. The experimental results as follows.(1) The discharge magnitude were proportioned to the luminous quantity.(2) The discharge magnitude and the luminous quantity are the maximum value at phase angle area of phi_7 (40ﾟ) and phi_<17> (220ﾟ).(3) The tree propagation speed was more accelerated by the discharges at phi_7 and phi_<17> system.(4) The discharge magnitude correlate closely the effective instantaneous voltage value multiply dv/dt.(5) The discharge luminescence was observed at void at phi_3, phi_4, phi_5.(6) The discharge path by single discharge were observed at single tree channel or multi tree channels.