TY - GEN
T1 - Influence of surface trap parameters on DC flashover in vacuum of epoxy composites
AU - Ru, Jiasheng
AU - Min, Daomin
AU - Ma, Bo
AU - Pan, Shaoming
AU - Xing, Zhaoliang
AU - Li, Shengtao
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/11/28
Y1 - 2016/11/28
N2 - Surface flashover phenomena under dc voltage greatly limit the improvement of insulating strength, which has been a key problem restricting the miniaturization and the practicality of high voltage dc power equipment. This paper investigated the influences of surface trap parameters for electrons on dc flashover in vacuum of epoxy composites. Pure epoxy resin, three kinds of epoxy nanocomposites and two kinds of epoxy microcomposites were used. In this paper, the surface trap distributions were calculated by a model of the detrapping of surface trapped charges based on surface potential decay measurements, and the influences of different additives on trap parameters and dc flashover voltages were also discussed. Considered electron triggered polarity relaxation model and secondary electron emission avalanche model, the relationships between dc flashover voltages and surface trap parameters were analyzed. The results show that: the epoxy samples with single trap center, in which the shallow trap centers disappear, have higher flashover voltages; respectively for the epoxy samples with single trap center and two trap centers, dc flashover voltages increase linearly with deep trap densities on semi-logarithm coordinate system.
AB - Surface flashover phenomena under dc voltage greatly limit the improvement of insulating strength, which has been a key problem restricting the miniaturization and the practicality of high voltage dc power equipment. This paper investigated the influences of surface trap parameters for electrons on dc flashover in vacuum of epoxy composites. Pure epoxy resin, three kinds of epoxy nanocomposites and two kinds of epoxy microcomposites were used. In this paper, the surface trap distributions were calculated by a model of the detrapping of surface trapped charges based on surface potential decay measurements, and the influences of different additives on trap parameters and dc flashover voltages were also discussed. Considered electron triggered polarity relaxation model and secondary electron emission avalanche model, the relationships between dc flashover voltages and surface trap parameters were analyzed. The results show that: the epoxy samples with single trap center, in which the shallow trap centers disappear, have higher flashover voltages; respectively for the epoxy samples with single trap center and two trap centers, dc flashover voltages increase linearly with deep trap densities on semi-logarithm coordinate system.
KW - dc flashover voltage
KW - epoxy composite
KW - surface potential decay
KW - surface traps for electrons
UR - https://www.scopus.com/pages/publications/85007228605
U2 - 10.1109/CMD.2016.7757997
DO - 10.1109/CMD.2016.7757997
M3 - 会议稿件
AN - SCOPUS:85007228605
T3 - CMD 2016 - International Conference on Condition Monitoring and Diagnosis
SP - 1008
EP - 1011
BT - CMD 2016 - International Conference on Condition Monitoring and Diagnosis
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2016 International Conference on Condition Monitoring and Diagnosis, CMD 2016
Y2 - 25 September 2016 through 28 September 2016
ER -