“…Porcelain column high-voltage disconnector is mainly used to provide an electrical interval during the maintenance of electrical equipment, which is a clearly visible disconnect point to ensure the personal safety of maintainers. 1,2 Most porcelain column high-voltage disconnectors work directly in the outdoor environment, thus are subject to the erosion of wind, frost, rain, and snow. Besides, a few attention has been paid to the daily maintenance and repair due to their relatively simple structure and low cost, resulting in frequent faults and defects, 3,4 such as mechanical defects, 5 conductive loop overheating, 6 secondary circuit defects, 7 and insulator damage defect.…”