Reduction of eddy current losses in pipe-type cable systems

Pipe-type cables have been the preferred alternative to overhead distribution in North America; their use and development have superseded that of self-contained oil-filled cables. However, the economics of pipe-type cable systems and the energy losses in the cables and pipe housing them are still a major concern, acting as a deterrent against their increased spread use by many electric power utilities. This paper presents the results of an experimental investigation aimed at reducing the eddy current losses in the system through the use of a spiral aluminum shield around the cables, along the interior of the pipe