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Space charge and AC electric breakdown strength in polyethylene

Space charge and AC electric breakdown strength in polyethylene
Space charge and AC electric breakdown strength in polyethylene
The effect of space charge on dielectric performances is generally neglected under high voltage alternate current (HVAC) electric fields, due to the limited charge amount accumulated. This paper intends to expound the characteristics of space charge in polymeric under AC stresses and its importance to the breakdown strength of polyethylene. A numerical model based on space charge dynamics under high voltage electric fields has been used to explain the differences of the breakdown strength in polyethylene under AC and DC stresses. Bipolar charge transport theory is adopted to analyse the charge transportation processes. Space charge profiles at the time of breakdown occurrence under different electric fields (including DC voltage, 0.5, 5 and 50 Hz AC voltages) and in the samples with different thicknesses (from 50 to 200 µm) are simulated. The relationship between space charge and the breakdown strength is discussed. The simulated results agree well with the trend of experimental breakdown results: generally, breakdown occurs easier under AC stress than DC stress; the breakdown strength is increased with the decrease of the sample thickness. The results suggest the presence of space charge under AC stresses has a great impact on electric breakdown strength of the material.
978 - 1 - 4673 - 7498 - 9
Zhou, Churui
c790215c-c3e7-4398-bb05-c4f9fc27558f
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhou, Churui
c790215c-c3e7-4398-bb05-c4f9fc27558f
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Zhou, Churui and Chen, G. (2015) Space charge and AC electric breakdown strength in polyethylene. IEEE Conference on Electrical Insulation and Dielectric Phenomena, Ann Arbor, United States. 18 - 20 Oct 2015. 4 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

The effect of space charge on dielectric performances is generally neglected under high voltage alternate current (HVAC) electric fields, due to the limited charge amount accumulated. This paper intends to expound the characteristics of space charge in polymeric under AC stresses and its importance to the breakdown strength of polyethylene. A numerical model based on space charge dynamics under high voltage electric fields has been used to explain the differences of the breakdown strength in polyethylene under AC and DC stresses. Bipolar charge transport theory is adopted to analyse the charge transportation processes. Space charge profiles at the time of breakdown occurrence under different electric fields (including DC voltage, 0.5, 5 and 50 Hz AC voltages) and in the samples with different thicknesses (from 50 to 200 µm) are simulated. The relationship between space charge and the breakdown strength is discussed. The simulated results agree well with the trend of experimental breakdown results: generally, breakdown occurs easier under AC stress than DC stress; the breakdown strength is increased with the decrease of the sample thickness. The results suggest the presence of space charge under AC stresses has a great impact on electric breakdown strength of the material.

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CEIDP2015-000158.pdf - Accepted Manuscript
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More information

Published date: 18 October 2015
Venue - Dates: IEEE Conference on Electrical Insulation and Dielectric Phenomena, Ann Arbor, United States, 2015-10-18 - 2015-10-20
Organisations: EEE

Identifiers

Local EPrints ID: 383626
URI: http://eprints.soton.ac.uk/id/eprint/383626
ISBN: 978 - 1 - 4673 - 7498 - 9
PURE UUID: fef20b0b-06d7-4740-a714-af62b1779bb2

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Date deposited: 27 Nov 2015 12:08
Last modified: 14 Mar 2024 21:45

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Contributors

Author: Churui Zhou
Author: G. Chen

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