直流电压下绝缘子附近球形导电微粒运动起始电压研究

为了研究绝缘子对自由导电微粒运动规律的影响，实验观测了直流电压下不均匀电场中的聚四氟乙烯（PTFE）绝缘子附近球形导电微粒运动特性．结果表明，PTFE绝缘子的存在降低了微粒运动起始电压，而且绝缘子的形状也会影响绝缘子附近微粒运动的起始电压．当绝缘子表面与接地电极夹角为锐角时，绝缘子对微粒运动起始电压的影响最显著，并且其影响范围也相对较大．对于相同绝缘子，微粒较大时易发生水平运动而附着于绝缘子表面，微粒较小时则容易离开接地电极而浮起．采用Maxwell应力张量对微粒受到的静电力进行了计算和分析，其结果从力学角度解释了实验观察得到的结果．

Threshold Voltage of Spherical Conducting Particle Motion near Spacer in Inhomogeneous Electric Field

To investigate the influence of the spacer on the motion of metallic particle,the threshold voltage of free spherical conducting particle motion near polytetrafluoroethylene(PTFE) spacer in inhomogeneous electric field under DC voltage is observed experimentally.The result shows that the motion threshold voltage declines due to the PTFE spacer,and is affected obviously by the spacer shapes.The voltage is remarkably weakened provided the angle between the spacer surface and grounded electrode gets acute within a relatively wide region of 30 mm.Around the same spacer,the particle with a bigger radius is apt to roll horizontally along the grounded electrode to cling onto the spacer,while the smaller particle tends to lift from the electrode.The electrostatic force evaluation with Maxwell stress tensor theory properly explains the experimental results.