Abridgment of guarding and shielding for dielectric loss: Measurements on 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 ends of the cable, these losses being insignificant in the case of the full reel but amounting 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.