Measurement of moisture diffusion as a function of temperature and moisture concentration in transformer pressboard

摘要

The moisture diffusion process is measured for oil-free transformer pressboard using a flexible interdigital dielectrometry three-wavelength sensor. Experiments are performed for five different temperatures at various moisture levels. Thediffusion coefficient as a function of temperature and moisture concentration is estimated and compared with literature values. The numerical methods of solving the diffusion equation are discussed