慢前沿冲击电流与放电通道光强度关系研究

采用冲击电流发生器对15 mm石墨棒状放电间隙放电,产生具有慢上升前沿的衰减振荡冲击电流波形,涉及4组电流共67个脉冲,含17个首次脉冲及50个后续脉冲,其峰值1.9～27.0 kA,10％ ～90％上升时间3.3～18.8μs,半峰宽度7.8～47.8μs.同步测量了石墨棒状放电间隙通道电流与光强度波形,开展了冲击电...

Correlation between slow-front impulse current and resultant channel luminosity in air gap discharge

Four groups of current with more or less symmetrical pulses were produced by an impulse current generator in the high-voltage laboratory.The current flow and the corresponding luminosity which emitted in the 15 mm open-air discharge gap were measured synchronously.These analyzed four-group currents contain a total of 67 symmetrical pulses,including 17 initial primary pulses and 50 subsequent pulses,covering a current amplitude ranging from 1.9 kA to 27.0 kA,a current 10%~90% risetime ranging from 3.3μs to 18.8μs,and a current half-peak width ranging from 7.8μs to 47.8μs.Here an analysis was given of parameter correlations between the current pulses and the luminosity pulses.Results show that the waveform characteristics of luminosity and that of discharge channel current signal are similar.The current peak is strongly,linearly correlated with the luminosity peak.Linear relations are also observed between the current 10%~90% risetime and the luminosity 10%~90% risetime as well as between the current half-peak width and luminosity half-peak width.The current charge transfer is linearly correlated with the luminosity-time integration.Overall,during both the rising portion and the decay portion,the luminosity waveform of subsequent pulse follows the current waveform better than that of primary pulse.In addition,with an exception of the initial primary pulses,the luminosity waveform is found to lag behind the current waveform,and this time delay tends to increase with the increasing current 10%~90%risetime.These correlation features between current and luminosity are similar to those found in M-component current pulses in rocket-triggered lightning flashes.