The development of underjacket moisture barrier cable as a counter measure against treeing

Abstract

Materials have been developed to allow rapid commercialization of under-jacket moisture barrier sheathed medium voltage power cables. Plastic coated aluminum and copper tapes meet the needs for a radial metallic moisture barrier. These tapes have outstanding initial adhesion to polyethylene, chlorinated polyethylene or polyvinyl chloride jackets and excellent bond stability during thermal loading, temperature cycling, water aging, and exposure to elevated temperatures. Semi-conductive water-swellable tapes have been developed which function as cushion (thermal expansion) layers and longitudinal water blocks. These tapes are commercially available from several sources. Commercially available hot melt adhesives are effective in sealing the overlap of the metallic moisture barrier and meet the criteria for adhesion and bond retention. These materials have been combined to produce a viable water impervious medium voltage power cable. Underjacket moisture barrier cables have been commercially manufactured and have passed several key industry tests. The propemes and installation characteristics of the cable are detailed in this paper.

A study on nanofiber‐reinforced thermoplastic composites (II): Investigation of the mixing rheology and conduction properties

“…ESD accounts for 40% of the failures that occur in the electronics industry at an estimated cost of billions of dollars, annually 10, 11. To overcome such costs, several different combinations of filled plastics with carbon fibers, metal flakes and fibers, metal‐coated fibers, and carbon black as well as blends of copolymers and chemically modified polymers have been investigated 4, 12–22. In this work, the use of nanofibers for development of conducting polymers and structural materials will be studied where a different dispersion is sought from the segregated networks often seen for carbon black4 and other dispersed conductive media 1.…”