Influence of trap depths on space charge formation and accumulation characteristics in low density polyethylene

Guochang Li, Shengtao Li, Daomin Min, Ni Zhao, Yuanwei Zhu

研究成果: Conference contribution

5 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルProceedings of IEEE International Conference on Solid Dielectrics, ICSD
ページ698-701
ページ数4
DOI
出版ステータスPublished - 2013
外部発表はい
イベントICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics - Bologna, Italy
継続期間: 2013 6 302013 7 4

Other

OtherICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics
国/地域Italy
CityBologna
Period13/6/3013/7/4

ASJC Scopus subject areas

  • 電子工学および電気工学
  • 電子材料、光学材料、および磁性材料
  • 材料化学
  • 凝縮系物理学

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