Effect of humidity on the properties of corona in a rod—plane gap under positive impulse voltages

Abstract

An experimental survey has been made of the effects of humidity on several properties of the positive corona discharge formed during 1/50 μs impulses in the region of the withstand voltage of a 60 cm rod-plane gap. By using field and charge measurement techniques simultaneously with direct photography and measurements of inception voltage, the variations with humidity of net corona charge and charge density, corona ‘radius’, electric field for propagation and charge transfer at the plane cathode have been characterized. It is shown that a number of these parameters change with humidity at about the same rate as the withstand voltage, that is, of the order of 1%/(g m -3 ), though the variation in net charge is an order of magnitude greater. Interaction with the cathode is discussed and shown to be complicated by the changes in the nature of corona that occur at higher humidities.

Computer models for estimating the breakdown voltage of air in uniform and non‐uniform fields at 30 kHz

“…This was repeated for each humidity level and frequency. An initial amount of charge based on the data from Ref. 17 was assigned to the geometry. The change in electric field due to the space charge was computed.…”

“…Figure 10 shows the variation of the charge density within the gap used for the charge simulations, which was based on the measurements presented in Ref. 17.…”

Miniaturized corona flow sensor operating in drift mobility increment mode for low flow velocity measurement

“…Since the late 1800s, it has been studied extensively for its behavior under different conditions and configurations [1]. Like most electrical discharges, its electrical characteristics can be highly susceptible to external perturbations such as changes in gas pressure, composition, humidity, temperature and flow rate [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. This has allowed corona discharge to be harnessed as a transduction mechanism.…”