A Review of Polypropylene and Polypropylene/Inorganic Nanocomposites for HVDC Cable Insulation

Abstract

Due to its excellent electrical and thermal performance, as well as satisfying the needs for developing the environmentally friendly and recyclable cable insulation material, polypropylene has caused widespread concern. Nanodoping can effectively improve the electrical, thermal and mechanical properties of polypropylene nanocomposites, which provides a new method to solve the problems in its application in HVDC cable insulation. This chapter introduces research achievements on polypropylene and polypropylene/inorganic nanocomposites, which states the effects of nanodoping on the electrical properties, such as space charge behaviors, electrical tree aging, breakdown strength, etc. thermal conductivity and mechanical properties of the polypropylene and its multi-blends. The aging mechanism under different conditions is also discussed. The analysis shows that the sur face treatment of nanoparticles can reduce the aggregation of nanoparticles and strengthen the interface effect, thus improving the comprehensive properties of polypropylene nano composites. This chapter also summarized the feasibility and future development of the polypropylene and its nanocomposites application in the insulation of HVDC cables. insulation material under the complex working conditions of high-voltage DC. Nanodoping can effectively improve the overall performance of polypropylene monomer and multicomponent blended composites, such as suppression of space charge accumulation, resistance to aging of electrical branches, improvement of dielectric strength such as breakdown strength, and improvement of thermal conductivity, tensile strength, and elasticity. Modulus and other thermal, mechanical properties, and nanofiller on the electric and thermal aging properties of the polypropylene composite material improvement effect is also very obvious.