填充介质对电晕放电特性的影响

为了研究填充介质对电晕放电的影响,本文采用针-板放电装置,研究了不同条件下正、负直流电晕放电的起晕电压、平均电流等特性,获得了正、负直流电晕放电和正脉冲电晕放电的时间积分图像及正脉冲电晕放电的时间分辨图像。还分析了介质尺寸、形状、填充密度以及介电常数对正脉冲电晕放电特性的影响。所得结果表明,填充介质导致正、负直流电晕起晕电压升高。正电晕放电更易于激发填充介质的表面放电,且尺寸小的介质颗粒更容易形成环绕颗粒表面的放电。在正脉冲电晕放电中,填充介质密度、介电常数越高,起晕电压越低;球状介质比圆柱形介质更容易形成表面放电。

Influence of Packed Material on Corona Discharge Characteristics

In order to study the effect of packed material on corona discharge, the corona inception voltage,the average current of positive/negative DC corona discharge of needle-to-plate configuration are investigated under different conditions. The time-integrated images of positive/negative DC corona and positive pulsed corona are obtained and compared. The time-resolved images of positive pulsed corona discharge are captured to study the dynamics of the pulsed discharge. The effects of the size, the shape, the filling density and the permittivity of the dielectric particle on the positive pulsed corona discharge characteristics are also analyzed. The results show that the inception voltages of positive and negative DC coronas increase due to filling packed material. The positive corona discharge is apt to excite the surface discharge along the dielectric surface. And it is easier to form the surface discharge around smaller dielectric particles. In the positive pulsed corona discharge, the corona inception voltage decreases as the density and the permittivity of the dielectric material increase. The experimental results also show that the surface discharges are more easily formed with spherical packing material than with cylindrical material.