TY - GEN
T1 - Luminescence characteristics before flashover across alumina ceramic under steady voltage in vacuum
AU - Su, Guo Qiang
AU - Mu, Hai Bao
AU - Song, Bai Peng
AU - Lang, Yan
AU - Zhang, Guan Jun
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2014/11/18
Y1 - 2014/11/18
N2 - The surface flashover issue has always been a hot topic in the insulation field and it has been reported that various luminescent phenomena occur before flashover under a high electrical field in vacuum, which are closely related to the behavior of charge carriers induced by discharge. However, it is still not so clearly about the intrinsic relationship between the luminescence phenomenon and the mechanism of flashover. This paper studies the luminescence on alumina ceramic under DC and AC excitation in vacuum, and the results show that under a relatively low voltage, the electroluminescence phenomenon on sample surface will be caused by radiative electron-hole recombination following charge injection. The luminescence intensity and spatial distributions for DC and AC voltage are obviously distinctive with each other due to the quite different recombination process. However, when it comes to a relatively higher voltage, making it possible for electrons to release from cathode triple junction due to field-enhanced emission, the cathode-like luminescence process will dominate, which is generated by a self-stabilizing secondary electron emission process and subsequent collision on insulator surface. This study might be helpful to comprehensively reveal the luminescence phenomenon regarding surface flashover.
AB - The surface flashover issue has always been a hot topic in the insulation field and it has been reported that various luminescent phenomena occur before flashover under a high electrical field in vacuum, which are closely related to the behavior of charge carriers induced by discharge. However, it is still not so clearly about the intrinsic relationship between the luminescence phenomenon and the mechanism of flashover. This paper studies the luminescence on alumina ceramic under DC and AC excitation in vacuum, and the results show that under a relatively low voltage, the electroluminescence phenomenon on sample surface will be caused by radiative electron-hole recombination following charge injection. The luminescence intensity and spatial distributions for DC and AC voltage are obviously distinctive with each other due to the quite different recombination process. However, when it comes to a relatively higher voltage, making it possible for electrons to release from cathode triple junction due to field-enhanced emission, the cathode-like luminescence process will dominate, which is generated by a self-stabilizing secondary electron emission process and subsequent collision on insulator surface. This study might be helpful to comprehensively reveal the luminescence phenomenon regarding surface flashover.
UR - https://www.scopus.com/pages/publications/84919394437
U2 - 10.1109/DEIV.2014.6961623
DO - 10.1109/DEIV.2014.6961623
M3 - 会议稿件
AN - SCOPUS:84919394437
T3 - Proceedings - International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV
SP - 77
EP - 80
BT - ISDEIV 2014 - Proceedings of the 26th International Symposium on Discharges and Electrical Insulation in Vacuum
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 26th International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV 2014
Y2 - 28 September 2014 through 3 October 2014
ER -