Deterioration of 24-kv power cables

Abstract

The radial variation in electrical and chemical characteristics of cable insulation between conductor and sheath has been investigated by a new method whereby the power factor and the total oxidation products in the oil are determined for the individual layers of paper tapes. The results of this investigation applied to several types of service aged cable are reported in this article.

Oil oxidation in impregnated paper

“…The behavior of impregnated speci mens may be largely influenced by this effect. 9. Power factor tests of paper layers following oxidation runs show no increase in layers next the electrodes in the one-millimeter speci mens, a very slight rise for the 5-centimeter specimens, and a definite rise above average values only for oxygen contents above 0.7 per cent by volume (5 centimeters pressure of oxygen impregnation).…”