Typical failure forms and improvement measures of power grid fasteners Zhi Huang, Chao Feng, Jun Liu, Jie Gong, Jiarui Hu, Yi Xie, Wun Wang, Yi Long and Weike Liu E3S Web Conf., 165 (2020) 06020 Published online: 01 May 2020 DOI: 10.1051/e3sconf/202016506020