A kind of cable semi-conductive shielding material and preparation method

Abstract

The invention discloses a semiconductive shielding material for a cable and a preparation method. The semiconductive shielding material comprises raw materials in percentage by weight as follows: 40%-80% of polyethylene, 5%-20% of an ethylene-vinyl acetate copolymer, 15%-40% of modified carbon black, 5%-20% of an assistant and 0.1%-1.5% of a crosslinking agent. Loading of reactive metal on the carbon black is provided for the first time, spatial potential distribution on the carbon black is improved, the surface properties of the carbon black can be improved to a certain extent, and the degree of dispersion of the carbon black during preparation of the shielding material is increased, so that excellent shielding material with smooth surface and small contact gaps with a conductor is prepared.

Description

technical field [0001] The invention relates to a shielding material, in particular to a medium and low voltage oil-resistant rubber semi-conductive shielding material for cables, and a preparation method for the shielding material. Background technique [0002] Research on the long-term stability of cables at home and abroad believes that one of the main reasons affecting the long-term service life is the partial discharge generated in the gap between the stranded conductor and the insulation. It is clearly stipulated in the national standard GB / T12706-2008 and IEC502 that XLPE insulated power cables of 3.6 / 6kV and above should have conductors and insulation shielding. In the cable, the electric field on the surface of the conductor is the highest, and if the shielding of the conductor is slightly imperfect, the possibility of free discharge is the greatest. [0003] An effective measure to prevent partial discharge is to use semi-conductive conductor shielding structure. ...

AI Technical Summary

Problems solved by technology

Since it is impossible to have no gap between the conductor and the insulation in the semi-conductive tape wrapping type, the effect is very unsatisfactory. Except for the low voltage level, it is rarely used, and it is basically not used now.