550 kV and 765 kV high pressure oil filled pipe cable system

This paper presents the results of a comprehensive 2 year scheduled acceptance test program performed at Waltz Mill Test Site under the auspices of EPRI on a 500/550 kV high-pressure oil-filled pipe cable system, described in detail in reference 1. Test data are also included for the extended phase of the original program where the cable was evaluated for higher rated voltages up to 765 kV. A detailed review of the test data as obtained at Waltz Mill and laboratory analysis of electrical characteristics of oil impregnated cellulosic laminar dielectric are presented. The temperature/voltage capabilities of cellulosic paper insulated oil impregnated EHV cable are determined and included in this paper.