Research on Defect Detection Technology of Composite Insulator Sheath Wenbo Li, Dun Mao, Yue Jiang, Lanlan Liu, Jiran Zhu, Tao Wan, Fanglin Zha and Yafeng Chao E3S Web Conf., 252 (2021) 01026 Published online: 23 April 2021 DOI: 10.1051/e3sconf/202125201026