Review on the Research Status of the High Voltage XLPE Cable Buffer Layer Failure

Based on the analysis of the characteristics of the buffer material, this paper discusses the research status of buffer layer failure at home and abroad, and provides suggestions for future research. Summary studies show that discharge is the direct cause of ablation failure of the buffer layer, and the moisture of the cable is a necessary condition for such failures. Long-term exposure to moisture will induce the increase of the resistivity of the buffer layer and accelerate the production of high-resistance white powder. When there is an air gap between the aluminum sheath and the insulating shielding layer, the increase in resistivity of the buffer layer, the production of white powder and the impact of overvoltage will cause the local field strength in the air gap to exceed the breakdown field strength, which will eventually cause the discharge ablation. The results of the full text review summarized the causes of buffer layer failures and proposed corresponding preventive measures, which can provide as references for future research on buffer layer failures.