Abstract：Based on the microcosmic physical processes of gas discharge,a mathematical physical model of the corona under negative damped oscillatory impulse is proposed in this paper.Collision ionization,drift,space photoionization,attachment and recombination are included in the proposed model.The space photoionization formula is deduced in a coaxial cylindrical geometry.The charge-voltage characteristics under the negative damped oscillatory or the double exponential impulses can be computed by the proposed model.The computed results can agree reasonably with those observed from experimental measurement.Both measurement and computation show that helical trajectories appear on the charge-voltage curves under damped oscillatory impulses,which reveals the main difference between the damped oscillatory and the double exponential impulses.In the decreasing range ofthe applied voltage,the electric field near the inner conductor is found to undergo a reversal due to the induction of space charge.As a result,the opposite polarity corona may occur.Using the proposed model,quantitative analysis is carried out for the electric field in the development process of the opposite polarity corona.
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2016, Vol. 31 
