120-Kv High-Pressure Gas-Filled Cable

Abstract
1. Nonleaded high-pressure gas-filled cable can be installed in a steel pipe without the insulation being adversely affected due to atmospheric exposure or mechanical handling. 2. No difficulty was encountered in the installation of 1,500-foot section lengths of cable on the commercial line. Based on the relatively low pulling stresses (7,200 pounds maximum), it appears perfectly feasible to install this type cable in lengths up to 2,000 feet. 3. The use of paper, preimpregnated with viscous compound, prevents migration at normal operating temperatures and allows installation on steep grades or in vertical runs without stop joints or other devices. 4. The satisfactory results on this type of cable are due in part to the development and use of a saturant of high viscosity and of excellent electrical properties. 5. The 60-cycle dielectric strength, both short- and long-time, is equivalent to that of oil-filled cable. 6. The impulse strength is at least the equal of oil-filled cable. 7 Power-factor values are approximately constant over a temperature range of 20 to 100 degrees centigrade. 8. The power factor was not affected even after six months at a temperature of 100 degrees centigrade. 9. The radial power-factor curve is flat even at 80 degrees centigrade, where impurities often cause erratic results. 10. Great uniformity of the insulation is indicated by the fact that on long-time voltage tests there are normally numerous partial failures, in addition to the completed failure. 11.

This publication has 2 references indexed in Scilit: