The present study deals with understanding insulation performance of thermally aged synthetic ester fluid through the measurements of corona inception voltage (CIV), fluorescent characteristics and dielectric loss. CIV tests were performed on thermally aged ester fluid, under AC voltage. The reduction in CIV was observed to be 54.3 % with the thermally aged ester fluid in presence of the magnetic field. Ageing temperature and time have exerted high influence on reduction in CIV. Statistical studies have shown high scatter in CIV data due to the combined effect of thermal ageing and magnetic field. Fluorescent spectroscopy studies have revealed a progressive shift in fluorescence maxima and a decrease in emission intensity with ageing time. Dielectric spectroscopy results have confirmed a reduction in dissipation factor due to thermal ageing. The drastic reduction in CIV values, shift in spectral data and increased dissipation factor after a certain duration of time and ageing temperature evidently indicate the degradation characteristics of insulation structures. A Fuzzy model is constructed to correlate the performance analysis of thermally aged synthetic ester using the results of above mentioned characterizations techniques in order to predict the key performance index and life time estimation of insulation structures.
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