Influence of applied voltage on space charge formation and accumulation characteristics of low density polyethylene

Yuanwei Zhu, Shengtao Li, Daomin Min, Guochang Li, Wencheng Wu, Weiwei Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Low density polyethylene (LDPE) has been widely applied on high voltage transmission cables due to its excellent insulating properties, good processability and chemical stability. Large numbers of experimental and theoretical studies have shown that space charge plays an important role in aging and breakdown in LDPE, and the applied voltage can significantly impact charge transport characteristic and space charge formation and accumulation in LDPE. By solving Schottky thermal emission equation, charge continuity equation and Poisson's equation, simulate space charge injection and accumulation phenomenon in LDPE under different applied voltages (0.4 kV-8 kV). The results show that: in a 1×10-4 m LDPE sample, space charge accumulation starts at the applied voltage of about 2 kV. The number of trapped electrons, free electrons and total amount of electrons all increase as the applied voltage goes higher. The higher the applied voltage, the faster the trapped electrons and total amount of electrons reach their stability. The space charge accumulation rate is fast before the injected electrons reach the anode, and slows down significantly after injected into the anode. The model has an important significance for in-depth studies to research and assess the LDPE insulating properties.

Original languageEnglish
Title of host publicationProceedings of IEEE International Conference on Solid Dielectrics, ICSD
Pages417-420
Number of pages4
DOIs
Publication statusPublished - 2013
Externally publishedYes
EventICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics - Bologna, Italy
Duration: 2013 Jun 302013 Jul 4

Other

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

Keywords

  • applied voltage
  • low density polyethylene (LDPE)
  • space charge
  • uni-polar charge transport model

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Condensed Matter Physics

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