A Planar Layered Two-Phase System Model of Frequency Response of Insulation System for Estimating Moisture in IOCT

作者：Wang, Qingpeng; Bai, Baodong^*; Chen, Dezhi; He, Xiaoyu

来源：IEEE Transactions on Magnetics, 2018, 54(3): 8400304.

DOI：10.1109/TMAG.2017.2768600

• Frequency-domain dielectric spectroscopy (FDS)
• inverted-type oil-immersed current transformer (IOCT)
• moisture content
• planar layered two-phase system model

In the estimation of moisture content of the inverted-type oil-immersed current transformer (IOCT) insulation system, the interfacial polarization between oil-immersed insulation paper and semi-conductive paper should be considered. The classical model functions of frequency-domain dielectric spectroscopy (FDS) are no longer applicable. Therefore, the planar layered two-phase system model is applied in this paper. First, the FDS of oil-immersed paper and semi-conductive paper with certain moisture content is measured using Alpha-A broadband dielectric spectrometer. Then, the FDS of oil-immersed insulation paper is explained using the Havriliak-Negami (H-N) model function and the amendatory H-N model function considering that the dc conductance is used to explain the FDS of semi-conductive paper. The two functions are substituted into the planar layered two-phase system model. The model parameters are fit by means of least-squares technique. Finally, the numerical relationship between the chosen characteristic parameter and the moisture content of the IOCT insulation system is obtained by least-squares technique. In engineering, one can use the results considering the influence of interfacial polarization to estimate the moisture content of the IOCT insulation system.

• 出版日期2018-3
• 单位沈阳工业大学