Investigation of AC/DC Resistance Ratios of Various Designs of Pipe-Type Cable Systems

Ac/dc resistance ratios of pipe-type cables are essential for the accurate determination of ampacity and power transmission capability. This Paper presents such measured and calculated data for large size compact segmental aluminum and tin and enamel coated copper conductor cables in carbon and stainless steel pipes. Ac/dc resistance ratios have also been determined for single cable per pipe systems. Measurements were also performed for special pipe designs comprising carbon steel pipes with silicon steel liners and a resin/steel composite structure. An economic evaluation of the various cable systems including material costs and cost per MVA-mile, employing present worth analysis is presented.