Power cable with water swellable agents and elongated metal elements outside cable insulation

摘要

A high voltage electrical power cable with a stranded central conductor encircled by insulation, a metal tape, metal strips or metal wires following helical paths outwardly of the insulation and a water swellable material at least between the adjacent edges of the tape, strips or wires. Preferably, the water swellable material is included with a polymeric material which is flowable at a temperature at least as low as 100 DEG C., the polymeric material has a 100 gram needle penetration value in the range from 50-100 tenths of a millimeter at 25 DEG C. and the water swellable material has a particle size not greater than 200 microns.