【摘要】 基于经典流注放电机理与分形理论,建立描述液体介质放电通道分枝现象的数学模型,依据此模型对针-板电极下变压器油液体介质放电过程进行数值模拟分析。构建液体介质放电实验系统,采用PI公司生产的PI-MAX型ICCD获取变压器油(45#)中放电通道空间形态演化特征信息。研究结果证实了液体介质放电通道具有一定的分形规律并伴有若干分枝状高导电轨迹演化过程,放电通道的分枝形态、通道内电荷量及发展速度受制于外施电压的幅值,且表现出不同的分形特征(维数)。更多还原

【Abstract】 Based on the classic streamer mechanism and fractal theory,a mathematical model describing the branching phenomenon of liquid dielectric discharge channels was established,and the evolution trajectory of liquid dielectric discharge under the needle-plane electrode was numerically modeled with the rigorous mathematical algorithm. Meanwhile,an experimental system of liquid dielectric discharge was constructed,and the PI-MAX type ICCD produced by PI Company was used to obtain the spatial morphological evolution characteristics of the discharge channel in the transformer oil( 45#). The results of the study confirm that the liquid dielectric discharge channel has a certain fractal law and is accompanied by the evolution of several branched high-conductivity trajectories. The branch morphology,the amount of charge in the channel,and the development speed of the discharge channel are limited by the magnitude of the applied voltage,then showing different fractal features( dimensions).更多还原