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In this paper a time domain diffusion-driven model is presented to investigate the correlation between the distribution of moisture during thermal transients, and the resultant polarization and depolarization current (PDC) measurement, for transformer cellulosic insulation. The oil-impregnated cellulosic insulation is modeled as being multiple layers of paper, with each layer having a different permittivity...
This paper proposes a diffusion-driven dielectric response model, which aims to reveal the effect of moisture diffusion on the dielectric response measurement of transformer insulation. In the proposed diffusion-driven model, the oil-impregnated pressboards are modeled as multiple layers and it is assumed moisture diffuses from one side of the pressboard. Then the dependency between the moisture concentration...
Power transformers are one of the most critical equipments in electricity network. A number of techniques such as dissolved gas analysis (DGA), polarization and depolarization currents (PDC) measurement and frequency domain spectroscopy (FDS) have been adopted across utilities for transformer insulation diagnosis. However, there are still considerable challenges remaining in interpreting measured...
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