Abstract
In this paper, accelerated multi-factor aging tests in laboratory have been conducted on the stator bars of a large generator. During the period of aging, the temperature spectra of dielectric dissipation factor tan /spl delta/ of stator insulation were employed to investigate aging characteristics of insulation materials. Test results showed that the peak temperature T/sub m/ of the tan /spl delta/ -T curve under 0.2U/sub n/ shifts to higher temperature with aging time. At the same time, the gradient of the peak decreased with aging time and the peak even disappeared in the measurement range of temperature finally. It was suggested that temperature spectra of dielectric dissipation factor tan /spl delta/ of stator insulation could be used to estimate the aging condition of large generator stator insulation.
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