Modeling the low frequency domain dielectric response of oil-paper insulation

The frequency domain dielectric response method has been one of the most effective approaches for the condition assessment of transformers. The low frequency part is more effective for diagnosing the moisture content and aging status of oil-paper insulation, which reflects the individual properties of the oil and the cellulose material. To facilitate the study of the low frequency dielectric spectrum of oil-paper insulation, a model applicable to the low frequency dielectric response of oil-paper insulation is proposed in this paper, which is on the basis of the electrode polarization of oil-paper insulation and XY model. The applicability of the model is verified against measured results.