研究了固体绝缘表面电荷对不均匀电场直流电晕起始电压、伏安特性的影响。
The effect of insulator surface charges on DC corona initial voltage and V-I characteristic in non-uniform field is studied.
文中通过实验测量和模拟计算，得到了不同气压湿度下的正直流电晕起始电压和电晕离子电流。
It was obtained through experiment and simulation that positive DC corona inception voltage and corona ion current under different air pressure and humidity conditions.
在较大分子的气体（如SF_6）中，正、负电晕起始电压有明显差别，而且随着气体压强增加而增大。
The results show that in SF6 there is obvious difference between the positive and negative onset voltage and the difference is increased by an increase of gas pressure.
当气体压力小于电晕稳定效应的临界压力，或由于温度降低而使压力减小到临界压力时，电晕起始电压随温度的降低而下降。
If the pressure is smaller than the critical one, following the decreasing of the temperature, the breakdown voltages will increase due to the corona stabilization effect.
外拖冲击电压的极性与绝缘子表面电荷极性是否相同会影响绝缘子的电晕起始时刻、由流注向先导的转变时间间隔和流注电晕电流。
The polarity of impulse voltage and the polarity of insulator surface electric charge can affect the corona initial time of insulator, the change time - interval and the corona current.
分析表明：突变现象是感应充电进入电晕充电的固有特性，电压降低，电流突然增大，产生突变，且不稳定的起始(着火)电压与电极的结构形式、尺寸、液体介电物理性质有关。
It is found that the instable start (ignition) voltage is related to the structure and the size of electrode as well as to the physical property of liquid electric inductivity.
分析表明：突变现象是感应充电进入电晕充电的固有特性，电压降低，电流突然增大，产生突变，且不稳定的起始(着火)电压与电极的结构形式、尺寸、液体介电物理性质有关。
It is found that the instable start (ignition) voltage is related to the structure and the size of electrode as well as to the physical property of liquid electric inductivity.
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