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The influence of frequency of AC component on space charge behaviours in polyethylene under combined AC and DC electric fields

The influence of frequency of AC component on space charge behaviours in polyethylene under combined AC and DC electric fields
The influence of frequency of AC component on space charge behaviours in polyethylene under combined AC and DC electric fields
Combined ac and dc voltages may occur in high voltage power transmission system, which bring challenges to the dielectric materials. Generally speaking, space charge is well recognised under high voltage dc conditions but has received little attention under high voltage ac conditions. Under ac electric fields, the formation space charge in the material depends strongly on the frequency. The knowledge of space charge behaviour in dielectric materials under combined voltages is desirable in terms of both experimental and simulation. In this paper, a numerical model based on the bipolar charge injection/transport model is used to analyse characteristics of space charge in polyethylene under combined electric fields at room temperature. The DC component ratio and the overall root mean square (RMS) are kept the same, while the frequency of the AC component is altered from O.05Hz to 50Hz. It has been found that the amount of the accumulated charges reduces with increasing frequency due to the more frequent polarity reversal. Moreover, the time to reach the steady states of charge amount increases with frequency as well
978-1-4799-7525-9
1-4
Zhou, Churui
c790215c-c3e7-4398-bb05-c4f9fc27558f
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zhou, Churui
c790215c-c3e7-4398-bb05-c4f9fc27558f
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Zhou, Churui and Chen, George (2014) The influence of frequency of AC component on space charge behaviours in polyethylene under combined AC and DC electric fields. 2014 Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), United States. 19 - 22 Oct 2014. pp. 1-4 .

Record type: Conference or Workshop Item (Paper)

Abstract

Combined ac and dc voltages may occur in high voltage power transmission system, which bring challenges to the dielectric materials. Generally speaking, space charge is well recognised under high voltage dc conditions but has received little attention under high voltage ac conditions. Under ac electric fields, the formation space charge in the material depends strongly on the frequency. The knowledge of space charge behaviour in dielectric materials under combined voltages is desirable in terms of both experimental and simulation. In this paper, a numerical model based on the bipolar charge injection/transport model is used to analyse characteristics of space charge in polyethylene under combined electric fields at room temperature. The DC component ratio and the overall root mean square (RMS) are kept the same, while the frequency of the AC component is altered from O.05Hz to 50Hz. It has been found that the amount of the accumulated charges reduces with increasing frequency due to the more frequent polarity reversal. Moreover, the time to reach the steady states of charge amount increases with frequency as well

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More information

Published date: 20 October 2014
Venue - Dates: 2014 Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), United States, 2014-10-19 - 2014-10-22
Organisations: EEE

Identifiers

Local EPrints ID: 373703
URI: http://eprints.soton.ac.uk/id/eprint/373703
ISBN: 978-1-4799-7525-9
PURE UUID: 2aab079e-1af3-4cb0-a94c-a86c13d1906b

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Date deposited: 02 Feb 2015 10:16
Last modified: 19 Jul 2019 20:53

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