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Flashover characteristics of vapor‐mist dielectrics under lightning impulse and means to increase the flashover voltage
Author(s) -
Yashima Masafumi,
Fujinami Hideo,
Takuma Tadasu
Publication year - 1993
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.4391130702
Subject(s) - arc flash , materials science , impulse (physics) , mist , dielectric , voltage , electron , electrical engineering , electrode , optoelectronics , mechanics , engineering , meteorology , chemistry , physics , quantum mechanics
It has been reported that the flashover voltage of gaseous dielectrics may increase greatly when they are mixed with carbon‐halide mist. However, the factors which bring about the increase of the flashover voltage still are not clarified fully. Based on the study on the basic flashover characteristics of vapor‐mist dielectrics, the authors have suggested the scarcity of initial electrons as the predominant factor. This paper investigates further the effect of UV light irradiation, flashover characteristics under forced supply of initial electrons, and for lightning impulse superimposed on dc voltage. These results have verified that the scarcity of initial electrons is the decisive factor in increasing the lightning impulse flashover voltage of vapor‐mist dielectrics. It is clarified also that the scarcity is attributed principally to: (1) the reduction of effective period (lifetime) of initial electrons, and (2) the suppression of photoelectric emission from electrodes.