Authors : A.M.O. Obiazi, P.A. Otubu and F.I. Anyasi
Abstract: Electrical insulating materials are required to maintain electrical and mechanical integrity sufficiently to prevent turn-to-turn or turn-to-ground shorts during operation, particularly at elevated temperatures. In this study, 10 sample varieties of Nigerian paper products were experimented upon to evaluate their suitability for use as electrical machine insulating materials for high temperature operations. Impregnated samples of the paper products were subjected to heat-run in a sealed industrial oven. The insulation resistance of each given sample was measured at regular temperature intervals, until the sample burns out. Tables show the values of weight, insulation resistance and temperature. Curves were plotted to show the variation of insulation resistance with temperature. From the results, all the paper samples could not produce insulation resistance above 8 MΩ at a temperature of 90°C while, at 110°C, they were all burnt. Thus, they are only suitable as electrical insulating materials for lower temperature operations, below 90°C.
A.M.O. Obiazi, P.A. Otubu and F.I. Anyasi, 2009. Suitability of Nigerian Paper Products as Insulating Materials for High Temperature Machine Operations. Journal of Engineering and Applied Sciences, 4: 100-102.