Analysis of the stochastic process in wire-plate negative corona discharge using statistical methods

Summary form only given. Lots of research have been carried out since Trichel pulse was presented in 1934^1,2. In order to obtain some stochastic properties of Trichel pulse in wire-plate negative corona discharge, statistical method is used in this paper to analyze three characteristic parameters of Trichel pulse, which are amplitude A, rising time t_r, half-falling time t_f. The corona discharge was generated using wire-plate electrod e structure which composed of a stainless steel wire of length 4cm and diameter 0.3mm and a 4×6cm2 stainless plate. The distance between the wire and plate is 2cm. All the results ba sed on 10000 pulses of each voltage which was set up to 14-18kv. The results shows there are different amplitude-pulses in one experiment when the voltage is fixed, and there is a dominant amplitude, discharge is not completely random process, as the voltage increase, there is a significant reduction after the in creasing of the pulse amplitude; The rising time does not change much in one experiment, basically concentrated around 100ns. With the voltage increasing, rising time increases slightly. The distribution of tf is scattered, which shows in the same experiment, t_f has strong randomness, and increases slightly with the voltage increasing which is similar with t_r. Both t_r an d t_f are not related to the amplitude, but there are a certain relationship to each other. It is inferred that the reason for stochastic process is that wire is not absolutely smooth. The wire-plate negative corona disc harge is actually combine of different needle-plate negative corona discharge along the wire.