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Numerical analysis on space charge and AC-DC combined breakdown strength in polyethylene

Numerical analysis on space charge and AC-DC combined breakdown strength in polyethylene
Numerical analysis on space charge and AC-DC combined breakdown strength in polyethylene
In high voltage direct current (HVDC) power transmission systems, electrical equipment at the valve side usually withstands complex stresses like AC-DC combined voltages. Understanding the charge migration and accumulation characteristics under complex stresses and their influences on the breakdown strength are of great significance. This paper presents an in-depth simulation study on the AC-DC combined breakdown strength using a modified bipolar charge transport model, which takes the deterioration of materials into consideration. Firstly, the simulation results of charge profiles under AC voltages agree well with experimental results, which partly illustrates the appropriate selection of parameters. Then the AC breakdown strengths with different ramping rates and frequencies are studied. Charges accumulated relatively close to the surface of samples can cause severe distortion of the electric field after the change of voltage polarity. After that, the breakdown voltages with different ratios of the AC to DC component are calculated and analyzed, especially on how AC and DC component influence the charge migration and accumulation during the evolution of the aging process eventually leading to breakdown. The simulation results of AC-DC combined breakdown voltages show good agreement with previous experimental results.
space charge , simulation, electrical breakdown, charge transport
1070-9878
826-834
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhou, Churui
c790215c-c3e7-4398-bb05-c4f9fc27558f
Zhang, Siyu
67f903b2-651d-4ad8-ad57-9261ec857064
Peng, Zongren
8fb15e49-3c15-403f-91c5-eda18ea36058
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhou, Churui
c790215c-c3e7-4398-bb05-c4f9fc27558f
Zhang, Siyu
67f903b2-651d-4ad8-ad57-9261ec857064
Peng, Zongren
8fb15e49-3c15-403f-91c5-eda18ea36058

Chen, Guanghui, Zhou, Churui, Zhang, Siyu and Peng, Zongren (2019) Numerical analysis on space charge and AC-DC combined breakdown strength in polyethylene. IEEE Transactions on Dielectrics & Electrical Insulation, 26 (3), 826-834. (doi:10.1109/TDEI.2018.007779).

Record type: Article

Abstract

In high voltage direct current (HVDC) power transmission systems, electrical equipment at the valve side usually withstands complex stresses like AC-DC combined voltages. Understanding the charge migration and accumulation characteristics under complex stresses and their influences on the breakdown strength are of great significance. This paper presents an in-depth simulation study on the AC-DC combined breakdown strength using a modified bipolar charge transport model, which takes the deterioration of materials into consideration. Firstly, the simulation results of charge profiles under AC voltages agree well with experimental results, which partly illustrates the appropriate selection of parameters. Then the AC breakdown strengths with different ramping rates and frequencies are studied. Charges accumulated relatively close to the surface of samples can cause severe distortion of the electric field after the change of voltage polarity. After that, the breakdown voltages with different ratios of the AC to DC component are calculated and analyzed, especially on how AC and DC component influence the charge migration and accumulation during the evolution of the aging process eventually leading to breakdown. The simulation results of AC-DC combined breakdown voltages show good agreement with previous experimental results.

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7779 - Accepted Manuscript
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Accepted/In Press date: 19 November 2018
e-pub ahead of print date: 29 May 2019
Published date: June 2019
Keywords: space charge , simulation, electrical breakdown, charge transport

Identifiers

Local EPrints ID: 426376
URI: https://eprints.soton.ac.uk/id/eprint/426376
ISSN: 1070-9878
PURE UUID: 5b74b368-c21c-4c45-a8b0-6e2a3ff550ec

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Date deposited: 26 Nov 2018 17:30
Last modified: 24 Oct 2019 04:01

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