A.N. Lesnichuk - Associate Professor, «National Research University «MPEI» (Moscow). E-mail: LesnichukAN@mpei.ru V.S. Mukhin - Associate Professor, «National Research University «MPEI» (Moscow). E-mail: MukhinVS@mpei.ru D.O. Safonov - Specialist, «National Research University «MPEI» (Moscow). E-mail: SafonovDmO@mpei.ru