Influence of Air Pressure on Corona Discharge Ion Mobility of Nitrogen Based on Drift Tube Method
Liu Yunpeng1, Wu Zhenyang2, Zhu Lei3, Pei Shaotong1
1. Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University Baoding 071003 China; 2. State Grid Changchun Supply Company Changchun 130000 China; 3. State Grid Nanjing Supply Company Nanjing 210000 China
Abstract The ion mobility in low gas pressure is a key parameter for corona discharge of power transmission line in high altitude area. Meanwhile, nitrogen as the main reaction gas in positive corona discharge, its existing value of the ion mobility takes no consideration of gas pressure. Actually, the measurements of ion mobility in different gas pressures have great significance to establish the ion current and corona loss calculation models. A needle-ring corona discharge experiment platform is designed and set up, which can simulate different gas pressures. What's more, the execution of the ion gate is improved from off-on-off to off-on, thus the waveforms with higher amplitudes of the ion could be gained. Thanks to the designed platform, the measured ion mobility of pure nitrogen under normal atmospheric condition is 1.113cm2V-1S-1. Besides, the positive nitrogen ion mobility at gas pressure of 101.19~44.52kPa is measured. The experimental results indicate that the ion mobility decreases nonlinearly with the increasing of gas pressure and has a certain trend of saturation. Finally, an index correction method is put forward.
Liu Yunpeng,Wu Zhenyang,Zhu Lei等. Influence of Air Pressure on Corona Discharge Ion Mobility of Nitrogen Based on Drift Tube Method[J]. Transactions of China Electrotechnical Society, 2016, 31(22): 223-229.
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2016, Vol. 31 
