Transactions of China Electrotechnical Society  2017, Vol. 32 Issue (17): 218-224    DOI: 10.19595/j.cnki.1000-6753.tces.160869
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Complex Relative Permittivity Expressions of Oil-Paper Insulation for Low Frequency Domain Dielectric Response
Wang Dongyang, Zhou Lijun, Chen Xuejiao, Liu Weidi, Wang Lujia
College of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China

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Abstract  Frequency domain dielectric response method has been one of the most effective approaches for the condition assessment of oil-paper insulation,and the low frequency part of the response is more effective for diagnosing the moisture content and aging status of oil-paper insulation.To facilitate the using of frequency dielectric domain dielectric response in engineering,the low frequency part dielectric response of oil-paper insulation system was studied in this paper.First,the electrode polarization of insulation dielectrics (oil-gap and oil-immersed paper) was analyzed when it is applied with low frequency excitations.Then,the complex relative permittivity expressions of insulation dielectric were obtained based on conductivity,ionic mobility and other parameters.On the basis of the geometric equivalent model (XY model) of oil-paper insulation system,the complex relative permittivity expressions of oil-paper insulation system for low frequency were obtained.Finally,the validity of established expressions about dielectric constants were testified by comparing the simulated and measured results.The results show that:the calculated complex relative permittivity can fit the measured results well,and the established expressions can effectively express the low frequency part dielectric response of oil-paper insulation system.
Key wordsOil-paper insulation system      frequency domain dielectric response method      electrode polarization      XY model     
Received: 08 June 2016      Published: 14 September 2017
PACS: TM855  
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Wang Dongyang
Zhou Lijun
Chen Xuejiao
Liu Weidi
Wang Lujia
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Wang Dongyang,Zhou Lijun,Chen Xuejiao等. Complex Relative Permittivity Expressions of Oil-Paper Insulation for Low Frequency Domain Dielectric Response[J]. Transactions of China Electrotechnical Society, 2017, 32(17): 218-224.
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