The corona inception voltage produced by negative polarity increased at first and then decreased, and corona characteristic has little changes.
负极性电晕起晕电压先升高后降低，电晕特性变化很小。
It was obtained through experiment and simulation that positive DC corona inception voltage and corona ion current under different air pressure and humidity conditions.
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。
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