高空低气压、低温环境下的电晕放电模拟试验系统

Experimental Simulation System of Corona Discharges Under High-altitude, Low-pressure and Low-temperature Conditions

为研究高空低气压、低温环境下的电晕放电特性,研制了由气压泵、气压计、温控箱、密闭气罐、高压静电源、动态电位测试仪等组成的低气压、低温环境电晕放电模拟试验系统。该系统可实现10-2 Pa^100 k Pa范围内的气压调节和-60~20℃范围内的温度调节,满足试验所需的气压和温度要求。并利用此系统进行了不同气压下的电晕放电试验,初步得到了电流波形随气压的变化规律。试验结果表明:在10~100 k Pa气压范围内,当温度、湿度等其他环境因素基本不变时,随着气压的降低,电晕放电电流脉冲上升沿及放电形成所需要的时间增加,而放电电流脉冲下降沿和持续时间基本不变,分别约为320 ns和600 ns。

To research the characteristics of corona discharge under high-altitude, low-pressure and low-temperature conditions, we built up a test system to simulate corona discharges under low pressure and low temperature. The system is consisted of a pneumatic pump, a pressure gauge, a temperature controller, a sealed tank, a high-voltage static power, a dynamic potential tester, etc.; pressure and temperature are adjustable within 10-2 Pa-100 k Pa and-60-20 ℃ respectively, which meet the requirements for simulating high-altitude corona discharge. We conducted tests of corona discharges under various pressures using the system, and obtained the regulation of current waveform varying with pressure. The results show that, with pressure decreasing from 100 k Pa to 10 k Pa while all the other environmental factors（such as temperature, humidity, etc.） barely change, the rise time of corona discharge current pulses and the duration of discharge forming process both increase, but the falling edge and duration of discharge current, which are about 320 ns and 600 ns respectively, barely change.