FIELD: electrical engineering, in particular, regulation of voltage loading, compensation of reactive power or balancing load in three-phase supply line. SUBSTANCE: method involves switching of thyristor gates of different modes in several stages in each of which load current circuit breaking and over- voltage at thyristor gates are prevented and moments of stage selection depend on phase angles at load which are equal to time zones of natural commutation of thyristor gates which are opened at these stages. Control unit of device is designed as programmed control system. EFFECT: increased functional capabilities. 2 cl, 3 dwg
