Effect of temperature change mode on condition assessment of oil-paper insulation using Frequency Domain Spectroscopy

This paper investigated the influence of temperature change mode on the establishment of assessment database of oil-paper insulation condition of transformer. According to the FDS properties of oil-paper insulation at different testing temperature and different temperature change mode, the quantitative assessment equations of moisture content and conductivity of oil impregnated paper of oil-paper insulation of transformer were introduced, and then the influences of testing temperature and temperature change mode on quantitative assessment results of oil-paper insulation condition of transformer were well studied. It indicates that FDS properties of oil-paper insulation were significantly influenced by testing temperature and temperature change mode. It is necessary to select not only an appropriate and consistent test temperature, but also a right way to change the temperature when establishing the condition assessment database of oil-paper insulation. The research results are available for reference to select accurate temperature change mode to carry out temperature-varying experiment in the laboratory.