Explanation and analysis of oil-paper insulation based on frequency-domain dielectric spectroscopy


During this paper, to effectively distinguish between the aging and moisture of oil-immersed paper (OIP), and to reinforce the accuracy of the nondestructive diagnosis of the insulating state for oil-paper insulation, we perform an in-depth study of the frequencydomain dielectric response theory. First, we have a tendency to present a theoretical explanation for frequency-domain spectroscopy (FDS) based on investigations into the mechanism and characteristics of conductivity loss and polarization loss. Secondly, we tend to explore the classical loss characteristics by performing a scientific analysis of the connection between the advanced dielectric permittivity and therefore the frequency based on the measured FDS curves. Finally, we tend to study the influences of the aging condition and moisture content on FDS. We tend to extract a number of the characteristic parameters that are related to the insulation condition. The results obtained indicate that at low frequencies, the FDS characteristic was mainly influenced by the conductivity loss, which may be explained by the Dyre model. At high frequencies, the characteristic was mainly influenced by the polarization loss, which might be explained by the H-N model. Furthermore, the characteristic at mid-range frequencies was because of both the conductivity and polarization loss. The moisture content considerably affects only the conductance method. Thus, the characteristic parameter, specifically the DC conductivity σ 0, which is closely related to the conductance method, can be used to quantitatively describe the moisture content of OIP. Meanwhile, the characteristic parameters α, β, and τ, that are related to the polarization process, can be used to quantitatively describe the aging status of OIP.

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