Power and control cables having flexible polyolefin insulation

Details Power and control cables having flexible polyolefin insulation Power and control cables having flexible polyolefin insulation

H - Electricity

01

B

26/129, 337/56,

H01B 3/42 (2006.01) H01B 19/00 (2006.01)

Patent

CA 1160301

ABSTRACT OF THE DISCLOSURE This invention is an improved insulation for electric cables and an improved method of making the insulation. Cross linked polyethylene insulation is too stiff, particularly in high voltage cables which require a thick layer of insulation. Copolymers of polypropylene have electrical properties substan- tially equal to those of polyethylene, but do not have the neces- sary physical strength and have to be filled with clay or other filler that provides the required strength but degrades the elec- trical characteristics. A novel feature of this method is the utilization of the screw of the extruder to effect a mixing of the ingredients in an improved polymer system for cable insulation.

370964

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