Application of 3D Design Technology in the Construction of 220KV Miluoxi Substation Jiang Wen, Yang Jin Hu, Zhai Wei, Xu Guangbing, Xiang Xinxin and Du Boyang E3S Web Conf., 248 (2021) 02051 Published online: 12 April 2021 DOI: 10.1051/e3sconf/202124802051