Polyethylene composition used for insulators and connections of ultra high voltage lines and super high voltage lines and connections using this polyethylene composition

摘要

The polyethylene composition of the present invention is useful for insulators and connections of ultra-high voltage wires, in which a crosslinking agent and an antioxidant including an organic peroxide to be purified are mixed, and the high-temperature composition has a temperature of 90 ° C. and an electric field of 20 mA / mm. It has a tangent (tan δ) of dielectric loss angle of 0.07% or less in strength. The polyethylene composition shows little dielectric loss even at high temperature or high field strength, and thus is optimally used for insulators and connectors for ultra high voltage transmission lines of 275 kV or more.;Furthermore, low density polyethylene and crosslinking agent dicumyl peroxide, such as polyether type compounds containing as few impurities as possible, are used to obtain such polyethylene compositions.