FIELD: electrical engineering; contactless on-load voltage regulation. SUBSTANCE: proposed method involves reduction of voltage regulation stage across load on geometric progression with its denominator equal to number of voltage levels across original module by using various operating conditions of one or more series-connected additional transformer-thyristor modules similar in their schematic and mechanical design, their output terminal power and voltage being reduced in same geometric progression compared with those of original module; input voltage of series- connected transformer-thyristor modules is chosen to be equal to middle value of on-load voltage regulation range; sum of maximal levels of output terminal voltages across all modules is assumed to be equal to half this range. Input terminals of primary windings of original transformer module of device implementing this method are connected to supply mains through double-winding matching transformer; one or more similar transformer-thyristor modules of lower capacity, whose secondary terminals and taps are connected , like original module, to supply mains through respective thyristor switches, are inserted in series between output terminals of primary windings of original module transformer; device control circuit is given in description of invention. EFFECT: provision for on-load voltage regulation at small stages within wide range; reduced cost for manufacturing device implementing this method. 2 cl, 6 dwg
