Corrosion Factors and Mechanisms of Buffer Layer and Aluminum Sheath Inside High-Voltage Cable

Abstract

Frequent failures of the buffer layer in high-voltage cables have been reported in recent years, which causes great losses. White spots and ablation were found inside these fault cables. The mechanisms of such failure phenomenon are still unclear, which arouses great attention of researchers. On the basses of previous studies, the authors characterized the fault cable, and studied the influence of the voltage type, moisture distribution, pressure, the shape of aluminum sheet on the generation of white spots. The authors proved the complexation of the water blocking powder and aluminum ions by using EDS (Energy Dispersive Spectroscopy). This paper provides meaningful theoretical supports for the design of new longitudinal water blocking structures.