Research on On-line Monitoring Technology of Secondary Equipment in Smart SubstationHongming Shen, Peili Yan, Teng Feng, Ziqi Wang, WenXuan Liu, Jing Jiang, Min Liu and Na DuE3S Web Conf., 256 (2021) 01021DOI: https://doi.org/10.1051/e3sconf/202125601021