Effect of temperature on electric?thermal properties of semi?conductive shielding layer and insulation layer for high?voltage cable

A semi-conductive shielding layer plays an important role in the uniform electric field for a high-voltage cable. The electric-thermal properties of and insulation directly affect overall performance physicochemical performances composites are firstly analysed herein. Furthermore, discussed. experimental results show that thermal conductivity commercial is about twice layer, owing to effect carbon black. expansion coefficient rises from 1.86 × 10?4/K at 25°C 3.20 90°C. By contrast, begins slowly decline certain temperature, decreases significantly 2.25 80°C, ethylene-vinyl acetate copolymer (EVA). electrical experiments resistivity composite gradually with increase declines black content. dc breakdown strength structure layer/insulation decreasing 307 kV/mm 203 At four typical temperatures, reaches maximum value when content 25 phr. It 15% 19% higher than contents 20 30 These findings have reference significance cable fault analysis material selection design.