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In this paper, evaluation of Nomex-910 and thermally upgraded Kraft (TUK) paper has been investigated in soya-based natural ester oil by performing accelerated thermal ageing. All the test samples have been prepared in standard oil/paper ratio in accordance with the IEEE Std. C57.154.2012 and are thermally stressed at 1200C, 1500C and 1800C as per modified ASTM D1934. Diagnostic measurements those including dielectric strength and tensile strength for insulating papers; UV/Vis spectroscopy, Dissipation factor, and Resistivity of oil have been reported as per ASTM standard test methods. The degree of concentration of conductive contaminants in Nomex system is slightly higher but are comparable. This is attributable to the high absorbance of Natural ester fluid. It is found, that dielectric strength and mechanical strength of Nomex paper is superior to that of the TUK paper. The deterioration rate of paper and the oil/paper insulation system has been verified with the natural ester-nomex insulation system and is found to be a possible alternative.

Thermal Performance of Nomex-910 and TUK Insulating Papers in Soyabased Natural Ester Oil