Thermo-oxidative Resistance of Cross Linked Polyethylene

INTRODUCTION Thermal oxidation is one of the most common and important stresses affecting polymers used as polymers, especially as electrically insulating materials, and is one of the main causes of insulation eventual failure. By increasing the thermal oxidative stability of the polymer, the lifetime of the insulation system can be greatly extended. As an alternative to perfect modification with micro or nano size additives or dispersed inorganic phases it is possible to deposit a film [1,2] (generally common general method) on the outer surface of the polymer device Proposed.

Vinyl triethoxysilane is used for the crosslinking of insulation of wires and cables and the production of coating materials for polyethylene. Compared with general crosslinking and radiation crosslinking, the peroxide crosslinking process has a polyethylene density range that is simple, has low investment, is easy to control, and is suitable for making special shapes. Sector cores and high extrusion rate silane crosslinked polyethylenes are widely used for the manufacture of electrical wires, insulators and coating materials for electrical wires, as they have excellent electrical properties, good heat resistance and resistance to stress cracking.

Crosslinked polyethylene (XLPE) insulated power cable has been used in Germany since around 1970. XLPE insulation has very good electrical, mechanical and thermal characteristics in medium voltage network. It is excellent in chemical resistance and cold resistance. With a variety of benefits, XLPE thermal insulation has largely replaced traditional classical paper insulation types in many areas. In order to prevent moisture intrusion and to extend the service life, the XLPE insulated medium voltage cable is designed with a longitudinal waterproof screen that includes an additional expansion strap and a PE outer jacket. The jacket is made on the basis of high density polyethylene (HDPE) with organic peroxide mixed with additives. Due to heat and pressure, the molecular chains bind to each other and ensure a transition from thermoplastic to elastic state.