Semi-conductive shielding material for 10-220kV electric cable and preparation method

Abstract

The invention relates to a semi-conductive shielding material for a 10-220kV electric cable and a preparation method. The semi-conductive shielding material has the advantages of non-crosslinking property, high temperature-resistant class, low volume resistivity, non pollution and recycling property. Polypropylene resin which is used as a substrate is mixed with conductive carbon black which is used as a conductive medium to form the non-crosslinking semi-conductive shielding material, of which the volume resistivity shall be no more than 10ohm.cm at the temperature of 20 DEG C, and shall be no more than 20ohm.cm at the temperature of 90 DEG C. The semi-conductive shielding material has the beneficial effects that the conductive property and heat stability of the shielding material are improved; because the polypropylene resin has good mechanical property and high temperature-resistant class, the polypropylene resin can work in the environment at the temperature of -20 to 95 DEG C for a long time under the condition of no crosslinking; for the semi-conductive shielding materials for medium, high and ultrahigh-voltage electric cables, the characteristics of high temperature-resistant property, non-crosslinking, environment-friendly and recycling properties, low resistance and heat stability are realized; when the semi-conductive shielding material is applied to the electric cable products, the electric field equalizing effect is improved, the local discharge is prevented, the reliability in running of electric cables is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to a 10-220kV high-voltage cable and a preparation method thereof, in particular to a non-crosslinked high-voltage cable made of polypropylene resin as a base material and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy and the increase in demand for electric energy, the use of high-voltage power cables is increasing, and it is constantly developing in the direction of high voltage, ultra-high voltage, large capacity and environmental protection. At present, domestic 35kV and below semi-conductive shielding materials have been completely localized, while 110-220kV ultra-high voltage semi-conductive shielding materials basically rely on imports. [0003] The existing domestic semi-conductive shielding materials for power cables are all made of EVA (Chinese name: ethylene-vinyl acetate copolymer, English name: ethylene-vinyl acetate copolymer, referred to as EVA) or PE (...

AI Technical Summary

Problems solved by technology

[0005] 1) After adding the crosslinking agent, its molecular structure becomes a network structure, and the dense network structure will hinder the connection between the particles of conductive carbon black, reduce the formation of conductive network, and lead to a decrease in the conductivity of the high-voltage cable composite material system , affecting the electric field equalization effect on cable products

[0006] 2) After EVA or PE is cross-linked, it becomes a thermosetting material, which cannot be recycled and is not conducive to environmental protection

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