Several physical characteristics of impulse-corona discharge around conductors. II. Onset voltage and delay time of corona discharge

For pt.I see ibid., vol.136, no.4, p.191-6 (1989). On the basis of the experimental tests conducted with the co-operation between Electricite de France and the Ministry of Electrical Energy. Polytechnical Institute of Bucharest, Rumania, the onset voltage and delay time of corona discharge around conductors was determined. The determination of these values has been investigated for single conductors (four types of conductors), as well as for bundled conductors (three types). The influence of the voltage impulse-wave type applied to conductors and of its polarity has also been dealt with. The authors outline the onset impulse-corona voltage and the delay time as a function of the ratio between the applied voltage and its amplitude, or as a function of the square root of the slope. Computation relations have been also approached with regard to on onset voltage, and the delay time, respectively of the impulse corona discharge around conductors.