electric field grading material, electric cable accessory, and electric cable joint.

摘要

electric field grading material comprising a nonpolar elastomeric polymer, a phyllosilicate charge and a carbon black charge, wherein any carbon black charge present in the electric field grading material has a dibutylphthalate absorption number ( dbp) from 30 to 80 ml / 100 g. The above material may be used in electrical cable fittings, particularly electrical cable joints or medium or high voltage cable terminations. The electric field grading material according to the present invention has variable resistance properties, particularly a significant variation of electrical conductivity as a function of applied voltage within a reduced voltage range, so as to ensure a high conductivity value above a critical value of the electric field and therefore to ensure a regular distribution of electric field lines within the material.