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The aim of this paper is to understand the controlling effects of negative ion density on the statistical time lags of positive impulse corona for a needle-plane dry air gap in the closed vessel.We calculated how the variation of negativee ion density depend on the waveform of applied impulse voltages, the polarity of DC-bias potential, UV irradiation and a metallic cage with various diameter using the steady state continuity equation for ion flow states.Under similar experimental conditions, we also measured the cumulative probability of corona inception as a function of time lags. From those results, it is concluded that the spatial and temporal distributions of negative ion densities in the gap space are very important to decide 50% sparkover voltages associated with the cumulative propability of corona inception.

Effects of Negative Ion Density Control on Statistical Three Lags of Positive Impulse Corona in Dry Air