Research on the thermal aging life prediction of XLPE cable

Abstract

Abstract Crosslinked polyethylene(XLPE) cable is one of the most important tools to transmit electric energy and electrical signals, but its insulation material is vulnerable to damage due to the complex working environment. If the aging cable is not replaced in time, it will easily cause fire and threaten the safety of life and property. Life prediction of cables is essential to ensure reliable operation. Hence, the objective of this study is to provide a theoretical basis for cable replacement. This paper, firstly, focuses on the thermal aging mechanism of cable. Based on Arrhenius Model, multivariate nonlinear regression method was used to process the data and the thermal aging life prediction model of cable had been derived. From the real operation perspective, the reliability of the model was analyzed. 50% of retention of elongation at break was measured as an indicator of the failure point, the life evaluations of cable was carried out. The result indicates that the service life of cable at 90 °C is 32.2 a.