Composite Insulator Defect Identification and Quantitative Method Based on Random Hough Transform Ellipse Detection

Abstract

To reduce the great influence on the operation of the transmission lines resulted from the external force damage of the insulator, and to improve the operation and maintenance level of the lines, a composite insulator defect identification method based on random Hough transform ellipse detection is proposed in this paper. This method takes the image of the insulator taken by drone aerial photography as the research object. First, the edge of the insulator is extracted by the Canny operator. Then, an ellipse curve fitting is applied to the extracted edge. Finally, the edge curve of the composite insulator is compared with the fitted elliptic curve, and the defect area is identified. This method cannot only identify the breakage state of the insulator, but also evaluate the degree of damage by comparing the damaged area.