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

doi:10.1109/ICSD.2013.6619662

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

6 Citations (Scopus)

Abstract

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.

Original language	English
Title of host publication	Proceedings of IEEE International Conference on Solid Dielectrics, ICSD
Pages	698-701
Number of pages	4
DOIs	https://doi.org/10.1109/ICSD.2013.6619662
Publication status	Published - 2013
Externally published	Yes
Event	ICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics - Bologna, Italy Duration: 2013 Jun 30 → 2013 Jul 4

Other

Other	ICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics
Country/Territory	Italy
City	Bologna
Period	13/6/30 → 13/7/4

Keywords

low density polyethylene
space charge
trap depth
unipolar charge transport

ASJC Scopus subject areas

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

Access to Document

10.1109/ICSD.2013.6619662

Cite this

Li, G, Li, S, Min, D, Zhao, N & Zhu, Y 2013, Influence of trap depths on space charge formation and accumulation characteristics in low density polyethylene. in Proceedings of IEEE International Conference on Solid Dielectrics, ICSD., 6619662, pp. 698-701, ICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics, Bologna, Italy, 13/6/30. https://doi.org/10.1109/ICSD.2013.6619662

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title = "Influence of trap depths on space charge formation and accumulation characteristics in low density polyethylene",

abstract = "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.",

keywords = "low density polyethylene, space charge, trap depth, unipolar charge transport",

author = "Guochang Li and Shengtao Li and Daomin Min and Ni Zhao and Yuanwei Zhu",

year = "2013",

doi = "10.1109/ICSD.2013.6619662",

language = "English",

isbn = "9781479908073",

pages = "698--701",

booktitle = "Proceedings of IEEE International Conference on Solid Dielectrics, ICSD",

note = "ICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics ; Conference date: 30-06-2013 Through 04-07-2013",

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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

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DO - 10.1109/ICSD.2013.6619662

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AN - SCOPUS:84891594783

SN - 9781479908073

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EP - 701

BT - Proceedings of IEEE International Conference on Solid Dielectrics, ICSD

T2 - ICSD 2013 - Proceedings of the 2013 IEEE International Conference on Solid Dielectrics

Y2 - 30 June 2013 through 4 July 2013

ER -

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

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ASJC Scopus subject areas

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