基于针-针电极直流高压电晕放电暗电流测量大气相对湿度的研究

摘要

To examine relationships between dark current from DC high-voltage corona discharge and relative humid-ity of atmosphere and make new methods available for measuring atmospheric humidity,a high-voltage DC needle-needle electrode was applied for discharging electricity. Meanwhile,theoretical relationships between dark current and humidity were deduced according to gas discharge theory. Then,an experimental model was built for measuring dark current,so as to measure the dark current discharged from the circuit outside the electrode in case of different input high voltage and humidity. Consistent with the rules of theoretical calculation,the results provided theoretical and experimental evidences for examining the measurement of atmospheric humidity based on the dark current from corona discharge. The results of experiment and calculation suggested that dark current from corona discharge de-clined with the decrease of input voltage and relative humidity. Under conditions of high relative humidity,dark cur-rent from corona discharge drastically increased with the rise of relative humidity.%为了研究直流高压电晕放电暗电流与大气相对湿度的关系，为大气湿度的测量提供新的方法。采用针-针电极结构的直流高压放电模型，通过气体放电理论推导了暗电流与湿度的理论关系；建立暗电流测量的实验模型，测量不同输入高压和不同湿度下电极外回路放电暗电流。实验结果与理论计算的规律一致，为电晕放电暗电流测量大气湿度的研究提供了理论和实验依据。实验和计算结果表明：电晕放电暗电流随着输入电压的降低和相对湿度的降低而减小；高相对湿度环境中，电晕放电暗电流随着相对湿度的升高而剧烈增大。