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Space charge and its impact on DC breakdown of polymeric materials

Space charge and its impact on DC breakdown of polymeric materials
Space charge and its impact on DC breakdown of polymeric materials
The presence of space charge will lead to distortion of electric field distribution within the dielectric material, resulting electric field enhancement in certain region of the dielectric. The electric field enhancement could cause material degradation, even premature failure. In this paper the simulation of charge dynamics in polyethylene based on the observed negative differential mobility has been carried out using the bipolar charge injection model. Assuming that the maximum electric field governs the breakdown event in the material, the simulation results show that the applied electric breakdown strength is thickness dependent during a ramping breakdown test. The thickness dependent breakdown strength has been experimentally observed and widely reported in literatures but the mechanisms have never been fully explained. Our model indicates that the space charge formation and its movement within the material are responsible for the effect of sample thickness on electric breakdown. Accumulation of positive charge in the region near to the anode leads to a local high field, which may initiate the breakdown when it reaches the breakdown strength of the material. Our recent experimental
observations of space charge dynamics up to breakdown in different thick samples strongly support the influence of space charge on electric breakdown.
686-691
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Chen, George (2013) Space charge and its impact on DC breakdown of polymeric materials. 18th International Symposium on High Voltage Engineering, Korea, Republic of. 25 - 30 Aug 2013. pp. 686-691 .

Record type: Conference or Workshop Item (Paper)

Abstract

The presence of space charge will lead to distortion of electric field distribution within the dielectric material, resulting electric field enhancement in certain region of the dielectric. The electric field enhancement could cause material degradation, even premature failure. In this paper the simulation of charge dynamics in polyethylene based on the observed negative differential mobility has been carried out using the bipolar charge injection model. Assuming that the maximum electric field governs the breakdown event in the material, the simulation results show that the applied electric breakdown strength is thickness dependent during a ramping breakdown test. The thickness dependent breakdown strength has been experimentally observed and widely reported in literatures but the mechanisms have never been fully explained. Our model indicates that the space charge formation and its movement within the material are responsible for the effect of sample thickness on electric breakdown. Accumulation of positive charge in the region near to the anode leads to a local high field, which may initiate the breakdown when it reaches the breakdown strength of the material. Our recent experimental
observations of space charge dynamics up to breakdown in different thick samples strongly support the influence of space charge on electric breakdown.

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Published date: 25 August 2013
Venue - Dates: 18th International Symposium on High Voltage Engineering, Korea, Republic of, 2013-08-25 - 2013-08-30
Organisations: EEE

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Local EPrints ID: 356492
URI: https://eprints.soton.ac.uk/id/eprint/356492
PURE UUID: 946627f8-4724-44fb-867b-be8fc1dd21b9

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Date deposited: 05 Sep 2013 08:55
Last modified: 18 Jul 2017 03:38

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