Guarding and Shielding for Dielectric Loss Measurement ons Short Lengths of High-Tension Power Cable

This paper presents the results of investigations made to explain the wide differences found between dielectric loss measurements made on full reel lengths of cable and on samples (10-ft. net length) removed from these reels. At least one source of such differences is found in losses occurring at the end of the cable, these losses being insignificant in the case of the full reel but amounting ing to as much as 100 per cent of the loss in the normal sample. Methods of determining, controlling, and eliminating these end losses are described.