FIELD: electric engineering, in particular, engineering of devices meant for powering three-phased motors from one-phased network without a constant current unit.
SUBSTANCE: in accordance to the invention, voltages of two phases, powered by pairs of oppositely-parallel connected thyristors through transformers, rectifiers and threshold elements are compared and, in case of asymmetry of voltages or loss of one of them, signal for switching consumers from reduced frequency to nominal one is generated.
EFFECT: increased reliability of operation of consumers, powered by frequency transformer and phases number, due to excluded emergency modes of operation by protection from asymmetry of phase voltage and phase tear, integrated in transformer.
1 dwg
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