A.N. Kamenskih - Post-graduate Student, Assistant, Faculty of Electrical Engineering, Department of Automation andelemechanics, Perm National Research Polytechnic University. E-mail: antoshkinoinfo@yandex.ru S.F. Tyurin - Dr.Sc. (Eng.), Professor, Faculty of Electrical Engineering, Department of Automation and tele-mechanics, Perm National Research Polytechnic University. E-mail: tyurinsergfeo@yandex.ru