Micro-Cracks Identification and Characterization on the Sheds of Composite Insulators by Fractal Dimension. - Hua Jin; Zekun Lv; Zhikang Yuan; Zixiang Wei; Cheng Wang; Cong Wang; Youping Tu; Fan Li 014; Tian Chen; Peng Xiao 004 (IEEE Trans. Smart Grid, 2021)