Research on insulation aging state of XLPE Cables under accelerated aging

The aim of this paper is to study the insulation aging state of XLPE cables under accelerated aging. We carried out the broadband dielectric spectrum test, power frequency breakdown test, differential scanning calorimetry test and Fourier transform infrared spectroscopy test on XLPE specimens. The test results show that, with the accelerated aging, the breakdown voltage of XLPE specimens rises and then falls, the dielectric constant and dielectric loss integral values decrease and then rise, the crystallinity increases and then falls, and the carbonyl index first falls and then rises. The research results show that the insulation state of cross-linked polyethylene is first optimized within a certain time of accelerated aging, but gradually deteriorates with the increase of accelerated aging time.