Answers are grounded in this paper and cite their sources.
An EHV power cable with compressed pure SF6gas insulation was produced experimentally, and succeeded in the dielectric withstand test. The outside diameter of one phase of the cable was 14 inches. The conductor, composed of a metal pipe 4½ inches in diameter, was arranged at the center of the outer pipe, and supported by spacers placed at intervals of about 15 feet.
No takes yet. Share an insight, caveat, or question.
Setsuo Fukuda (1967) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: