Characteristic Parameters Extracted From Modified Cole-Cole Model and Moisture Content Assessment Methods Study on Frequency-Domain Dielectric Spectroscopy of Oil-Paper Insulation
Yang Lijun1, Gao Sihang1, Gao Jun1, Liu Jiefeng1, Yao Renyun1, Liu Zhizhong2
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2. Guangyuan Power Supply Bureau State Grid Sichuan Electric Power Company Guangyuan 628000 China
Abstract：In order to apply the technology of frequency-domain dielectric spectroscopy (FDS) to quantitatively assess moisture contents of oil-paper insulation for transformer, the oil paper insulation samples with different moisture contents were prepared under laboratory conditions. After analyzing the influence of moisture content on frequency-domain dielectric property of oil-paper insulation samples, this paper introduced the modified Cole-Cole model to extract the frequency-domain dielectric parameters. The effects of moisture content on frequency-domain dielectric characteristic parameters are studied, and the new quantitative relationships between the moisture content and the characteristic parameters were proposed. The results show that the moisture contents heavily affect the frequency-domain dielectric property of oil-paper insulation samples. Among the characteristic parameters extracted from modified Cole-Cole model, α relaxing time constant τα decreases and conductivity σdc increases respectively with the moisture contents m.c. increasing. The fitting results primarily show that the relationship between τα and m.c. is exponential, and the relationship between σdc and m.c. is linear. Thus τα and σdc can be taken as two characteristics for moisture content estimation.
杨丽君, 高思航, 高竣, 刘捷丰, 姚人允, 刘志忠. 油纸绝缘频域介电谱的修正Cole-Cole模型特征参量提取及水分含量评估方法[J]. 电工技术学报, 2016, 31(10): 26-33.
Yang Lijun, Gao Sihang, Gao Jun, Liu Jiefeng, Yao Renyun, Liu Zhizhong. Characteristic Parameters Extracted From Modified Cole-Cole Model and Moisture Content Assessment Methods Study on Frequency-Domain Dielectric Spectroscopy of Oil-Paper Insulation. Transactions of China Electrotechnical Society, 2016, 31(10): 26-33.
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