Challenges and methods of monitoring the occurrence of unsanctioned voltage in the power gridAlexander Panfilov, Alexander Vinogradov, Alina Vinogradova, Vadim Bolshev, Zumeira Shakurova and Elena ZaugolnikovaE3S Web Conf., 288 (2021) 01111DOI: https://doi.org/10.1051/e3sconf/202128801111