Synthetic Paper for Extra Highh Voltage Cable

Extra high OF cables insulated by synthetic paper exclusively made of synthetic polymer were developed. It has been proved that the synthetic paper, given a structure similar to conventional paper, showed more favorable electric and physical characteristics and oil resistance, thus solving problems of extra high OF cables using films for insulation. This improvement is due to a structure having minute pores. This report develops considerations on this point. Trial OF cables with the synthetic paper for insulation were produced and tested on their characteristics; the measured results were satisfactory. Heating tests by loading power were conducted on its model samples. The test results showed that the synthetic paper is superior over the kraft paper as the insulator because of better heat resistance of its component polymers.