Improvement of the gas chromatographic method for diagnosing developing defects in oil-filled electrical equipment based on the analysis of furan compoundsNgoc Dan Vu, Alina Vyacheslavovna Taneeva and Vyacheslav Fedorovich NovikovE3S Web Conf., 288 (2021) 01080DOI: https://doi.org/10.1051/e3sconf/202128801080