Analysis of Backup Protection Action of a Transformer Caused by Improper Implementation of Voltage Regulation MeasuresYu Chen, Hongcheng Ding, Junwei Zhang, Ganghui Ding, Jun Cui and Shengzhi HuE3S Web Conf., 252 (2021) 02013DOI: https://doi.org/10.1051/e3sconf/202125202013