Jun Gao

TL;DR: In this paper, a non-destructive evaluation technique based on time-frequency domain dielectric characteristics was proposed for the oil-impregnated power transformers in service.

TL;DR: In this paper, the frequency domain dielectric response measurement results of oil-paper insulation samples under different moisture contents and aging states, and then the extracted frequency Dielectric characteristic parameters determined from the imaginary part of relative permittivity (ϵr′′) and dielectrics dissipation factor (tanδ) curves are used to assess the moisture contents, moisture content, and degree of polymerization are also established.

TL;DR: In this article, a method was proposed based on a study of the influence of the aging state and moisture content on the frequency domain dielectric property of oil-paper insulation.

TL;DR: In this article, the authors used a two-parameter Weibull model to acquire the average breakdown time, which was then applied to establish the inverse power law life model to choose appropriate test voltages.

TL;DR: In this article, the influence of temperature change mode on the establishment of assessment database of oil-paper insulation condition of transformer was investigated, and the quantitative assessment equations of moisture content and conductivity of oil impregnated paper of oil insulation of transformer were introduced.