TY - GEN
T1 - Influence of trap depths on space charge formation and accumulation characteristics in low density polyethylene
AU - Li, Guochang
AU - Li, Shengtao
AU - Min, Daomin
AU - Zhao, Ni
AU - Zhu, Yuanwei
PY - 2013
Y1 - 2013
N2 - In extra high voltage transmission systems, the accumulation of space charges in polymeric materials have an important influence on the aging and breakdown of power equipments. It has been reported that space charges are mainly determined by trap distribution. Therefore, it is important to understand the influence of trap depths on space charges accumulation in insulating material. In this paper, based on charge migration, trapping and detrapping processes, an unipolar charge transport model has been adopted. The influence of trap depths on space charge in low density polyethylene can be obtained through solving the charge continuity equation, Poisson equation and first order charge trapping/ detrapping dynamic equation. The calculation results show that the free electron density and trapped electron density decrease gradually with the increase of sample position. With the trap depth increases, the total number of trapped electrons also increases, but the total number of free electrons decreases gradually. When the trap depth is larger than 1.1 eV, the total number of space charges in material keeps an equilibrium value. This research provides a theoretical guidance for diagnosing aging degree of insulating equipments in the future.
AB - In extra high voltage transmission systems, the accumulation of space charges in polymeric materials have an important influence on the aging and breakdown of power equipments. It has been reported that space charges are mainly determined by trap distribution. Therefore, it is important to understand the influence of trap depths on space charges accumulation in insulating material. In this paper, based on charge migration, trapping and detrapping processes, an unipolar charge transport model has been adopted. The influence of trap depths on space charge in low density polyethylene can be obtained through solving the charge continuity equation, Poisson equation and first order charge trapping/ detrapping dynamic equation. The calculation results show that the free electron density and trapped electron density decrease gradually with the increase of sample position. With the trap depth increases, the total number of trapped electrons also increases, but the total number of free electrons decreases gradually. When the trap depth is larger than 1.1 eV, the total number of space charges in material keeps an equilibrium value. This research provides a theoretical guidance for diagnosing aging degree of insulating equipments in the future.
KW - low density polyethylene
KW - space charge
KW - trap depth
KW - unipolar charge transport
UR - https://www.scopus.com/pages/publications/84891594783
U2 - 10.1109/ICSD.2013.6619662
DO - 10.1109/ICSD.2013.6619662
M3 - 会议稿件
AN - SCOPUS:84891594783
SN - 9781479908073
T3 - Proceedings of IEEE International Conference on Solid Dielectrics, ICSD
SP - 698
EP - 701
BT - ICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics
T2 - ICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics
Y2 - 30 June 2013 through 4 July 2013
ER -