Study on the Influence of Crosslinking Temperature on the Dielectric and Thermal Conductivity of Cable Insulation Materials

To investigate the effect of crosslinking temperature on the dielectric and thermal conductivity of cable insulation materials and analyze its mechanism of action. This article obtains three types of insulation materials by controlling the cross-linking temperatures of cable insulation materials to 160, 180, and 200 °C, respectively. Then, by combining microscopic characterization, electrical and thermal testing methods, the structure effect relationship between the crystal morphology of insulation materials and their electrical and thermal properties is revealed. The results show that at a crosslinking temperature of 180 °C, the insulation material can be fully crosslinked without thermal aging defects, and the crystallinity reaches the optimal value of 34.82%, presenting a small and uniform crystal configuration, thereby enhancing the dipole polarization of the insulation material and making the dielectric constant of the material reach 2.28; However, the introduction of three-dimensional cross-linking points and aging defects can hinder the free path of phonon transmission, thereby reducing the thermal conductivity of the material.