Research on Zero Value Detection Technology of Porcelain Insulator Xiaopo Mao, Xueming Zhou, Yaodong Zhang, Zijian Li, Zeqi Huang, Zhiqiang Feng, Xiang Ren, Jianjin Fu, Junjie Huang and Tianru Shi E3S Web Conf., 257 (2021) 01021 Published online: 12 May 2021 DOI: 10.1051/e3sconf/202125701021