Method for detecting and identifying internal defects of in-operation high-voltage cable through X-ray digital imaging

• Main Authors: ZHANG SAIPENG, SI CHANGJIAN, LIN HAIDAN, CUI TIANCHENG, LIU ZUOMING, ZHAI GUANQIANG, LUAN JINGYAO, LI SHOUXUE, YANG DAIYONG, GAO CHANGLONG, JIANG HAO, ZHAO CHUNMING, LIU GUIMEI, CHEN JIEYUAN, DONG HONGDA, JIANG LU, JIN PENG, LIE JIANPING, TAI YUFENG, LI JIASHUAI, YOO HYUK, JIAO LIXIN, GE ZHICHENG, XU WENXIE, LIU DAN, LIU JUNBO, QIAN ERGANG, YU QUNYING
• Format: Patent
• Language: Chinese; English
• Published: 22.07.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for detecting and identifying internal defects of an in-operation high-voltage cable through X-ray digital imaging, which comprises the following steps of: (1) starting an X-ray detection system, and acquiring an original image of a sequence X-ray detection cable; (2) rejecting improper pictures; (3) identifying contour lines of different material areas by using gray level step, and extracting images of different areas of the cable; (4) de-noising the images of the different regions by adopting a bilateral filtering optimization algorithm; (5) after the X-ray detection image is subjected to denoising processing, sequence images are subjected to multi-frame superposition, and the graphic morphological characteristics of the gray difference area are detected; and (6) establishing a high-voltage cable defect database according to the fault and detection data, and performing judgment according to comparison between the established high-voltage cable internal defect feature informa