H - Electricity – 01 – B
Patent
H - Electricity
01
B
337/56
H01B 9/02 (2006.01) B21C 23/00 (2006.01) B21C 33/00 (2006.01) B22F 3/20 (2006.01) B29C 47/52 (2006.01) B30B 11/22 (2006.01)
Patent
CA 1166324
ABSTRACT ELECTRIC CABLES In an electric cable for service at about 15kV and above, at least one extruded semiconductive screening layer comprises metal particles dispersed in a polymeric matrix. The matrix adheres both to the particles and to the insulation and at least the polymeric material in the matrix (normally in the insulation as well) is cross- linked by the technique involving grafting silane side- chains to the polymer and then cross-linking them by hydrolytic condensation (the "Sioplas-E" process). The proportion of dispersed conductive particles is sufficient to give a resistivity in a longitudinal direction of no more than 5000 ohm-cm. The resistivity of the metal of the particles does not exceed 15 IACS and its hardness is not greater than 100 Brinell A. The particles have an average length of at least 1 mm (normally exceeding the thickness of the screening layer) and an aspect ratio of at least 10:1. By selecting the particles in this way, conductivity is achieved with a material that is still extrudable, and the use of metal particles rather than conductive carbon black avoids the severe detrimental effects on the cross-linking process of moisture carried by the reactive surface of the carbon black.
386092
Bicc General Uk Cables Limited
Bicc Limited
Fetherstonhaugh & Co.
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