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Comparison of Two Charge Packet Models under dc Electric Fields

Comparison of Two Charge Packet Models under dc Electric Fields
Comparison of Two Charge Packet Models under dc Electric Fields
Charge packet under high electric dc fields has been observed in polyethylene and its formation has been closely associated with ageing and breakdown of the insulating material. To understand the mechanisms several models have been proposed. In this paper, two models originated from completely different approaches have been reviewed. The first model proposed is based on bipolar charge injection together with electric field dependent mobility. It has been found that the negative differential mobility with the electric field is essential for the formation of charge packet. On the other hand, the second model considers the change in conductivity after charge injection. By assigning different conductivities to two different zones it is possible to form a charge packet that bears some similarity with the observed features. Simulations based on these two models have been carried out and both dynamics of charge packet and resultant current in the two models are compared and discussed.
978-1-4673-4459-3
931-934
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wang, Y
adc6c787-e577-46bf-bda7-740d56e7d554
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wang, Y
adc6c787-e577-46bf-bda7-740d56e7d554

Chen, G and Wang, Y (2013) Comparison of Two Charge Packet Models under dc Electric Fields. IEEE 2013 International Conference on Solid Dielectrics (ICSD), Bologna, Italy. 30 Jun - 04 Jul 2013. pp. 931-934 .

Record type: Conference or Workshop Item (Paper)

Abstract

Charge packet under high electric dc fields has been observed in polyethylene and its formation has been closely associated with ageing and breakdown of the insulating material. To understand the mechanisms several models have been proposed. In this paper, two models originated from completely different approaches have been reviewed. The first model proposed is based on bipolar charge injection together with electric field dependent mobility. It has been found that the negative differential mobility with the electric field is essential for the formation of charge packet. On the other hand, the second model considers the change in conductivity after charge injection. By assigning different conductivities to two different zones it is possible to form a charge packet that bears some similarity with the observed features. Simulations based on these two models have been carried out and both dynamics of charge packet and resultant current in the two models are compared and discussed.

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Published date: 30 June 2013
Venue - Dates: IEEE 2013 International Conference on Solid Dielectrics (ICSD), Bologna, Italy, 2013-06-30 - 2013-07-04
Organisations: EEE

Identifiers

Local EPrints ID: 355138
URI: https://eprints.soton.ac.uk/id/eprint/355138
ISBN: 978-1-4673-4459-3
PURE UUID: ba836132-6d55-4812-9bea-425132e820da

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Date deposited: 31 Jul 2013 10:54
Last modified: 19 Jul 2019 21:30

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