1. Institute for Physics of Mining Processes, NAS of Ukraine, Simferopolskaya st., 2a, Dnepr 49600, Ukraine
2. Department of Electrical Engineering, Donetsk National Technical University, Shibankova sq., 2, Pokrovsk 85302, Donetsk region, Ukraine
3. Galkin Institute for Physics and Engineering, R. Luxembourg st. 72, Donetsk 83114, Ukraine