POWER CONVERTER USED TO FEED ELECTRIC ARC FURNACE WITH DIRECT CURRENT AND POWER CONVERTER UNIT Russian patent published in 1998 - IPC

FIELD: electrical engineering. SUBSTANCE: converter has at least one transformer, whose primary is fed with three-phase alternating current, and whose at least one secondary produces three-phase current at its output applied to rectifying facilities; rectified voltage and current are fed from the output of these facilities to the load, the mentioned rectifying facilities have controlled semiconductor devices for each secondary. Rectifying facilities have a circuit of overrunning clutch-type wheel performing the duties of wheel with an overrunning clutch; the mentioned semiconductor devices are triggered with varying firing (rendering the conducting)angles, varied in such a manner that with the decrease of duration of conducting state of the main, triggered semiconductor devices duration of conducting state of devices of the "overrunning clutch-type wheel" increases respectively, and vice versa, which makes it possible to give off in essence constant active or reactive power to the load irrespective of fluctuations of the load impedance. EFFECT: enhanced efficiency. 11 cl, 15 dwg