Comparative evaluation of mineral oil and natural ester impregnated cellulose using oil and paper conductivity

Abstract

The paper mainly focuses on the condition monitoring of oil paper insulation using a macroscopic parameter that is conductivity. The polarization and depolarization currents are measured at various moisture contents and temperature. Then oil and paper conductivity are separately calculated and are plotted against various moisture contents and temperatures. On the basis of conductivity variations, conclusions are drawn such that they do fall in line with the established cellulose chemistry in mineral oil as well as in natural ester.