Using Field-Effect Gas Sensors for Monitoring H2 in Transformer Oil Artur Litvinov, Nikolay Samotaev, Maya Etrekova, Anastasia Ivanova, Dmitriy Filipchuk and Yuri Klishin MATEC Web Conf., 327 (2020) 01005 Published online: 06 November 2020 DOI: 10.1051/matecconf/202032701005