Study of conductive anti-corrosion coating for preventing buffer layer ablation faults in high-voltage cable

In recent years, high-voltage cables with wrinkled aluminum sheath structure have frequent buffer layer ablation failures, and the electrochemical corrosion between the aluminum sheath and the buffer layer is considered to be an important cause of buffer layer ablation. At present, the whole line replacement method is generally used to solve the ablation fault of the cable buffer layer, which is costly and time-consuming. There are also many scholars who have conducted research on the ablative repair agent of the buffer layer, but there are problems such as the difficulty of injecting the repair agent and the easy impact of the repair agent on the buffer layer. In this paper, a conductive anticorrosive coating is sprayed on the side of the aluminum sheet, a simulated ablation experiment is carried out, the microscopic morphology of the buffer layer after simulated ablation is observed by electron microscope, and the ablation product is analyzed by energy dispersive spectrometer. The results show that under constant current conditions, the voltage continues to increase during the simulated ablation process, and the electrochemical corrosion produces high-resistance products, and the voltage is maintained at a low level after applying the conductive anti-corrosion coating, which prevents the occurrence of electrochemical corrosion. After simulated ablation, the buffer layer fiber is fused, and a large amount of white powder is adhered to, and the buffer layer did not change significantly after the conductive anticorrosive coating is applied, and the ablation of the buffer layer is well prevented by the application of the conductive anticorrosive coating. The method of conductive anti-corrosion coating studied in this paper has certain reference significance for optimizing the cable structure and preventing the occurrence of buffer layer ablation failure.