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The statistical inception mechanism of the first corona in positive nonuniform air gaps ranging from 0.3 to 1.0 cm
Author(s) -
Nishijima Kiyoto,
Ishii Toshiyuki,
Izawa Yasuji
Publication year - 2006
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20445
Subject(s) - ion , corona discharge , corona (planetary geology) , atomic physics , range (aeronautics) , electron , irradiation , cathode , physics , materials science , computational physics , mechanics , chemistry , nuclear physics , voltage , quantum mechanics , astrobiology , venus , composite material
The aim of this paper is to understand the statistical inception mechanism of the firsYasujina in positive nonuniform air gaps ranging from 0.3 to 1.0 cm. We calculated first how the spatial distributions of negative ion density depend on the gap length, UV irradiation, and the concentration of water vapor using the steady‐state continuity equation for ion flow states. Next the cumulative probability of the first corona inception as a function of the statistical time lags was evaluated using the critical volume model in which initial electrons are provided by collisional detachment of negative ions. Furthermore, we also measured the cumulative probability of the corona inception under similar experimental conditions. From a comparison between the numerical and experimental results and their discussions, it was found that in the short range of the gap length, negative ions produced near the cathode associated with positive ion bombardment play an important role in the statistical inception mechanism of the first corona. Also, a much higher probability of corona inception in the case of UV irradiation was attributed to the number of negative ions produced near the cathode through the photo emission process. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 158(2): 1–8, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20445