The paper discusses the impact of steel mill power supply conditions on the magnitude of voltage fluctuations generated by arc devices. The results of model studies and measurements of light flicker indicators recorded in networks with different short-circuit capacities supplying arc devices are presented. The minimum ratio of the short-circuit capacity at the steel mill busbars to the power during a three-phase short circuit of electrodes with charge is indicated, so that the furnace does not generate excessive voltage fluctuations manifesting as annoying light flicker.Due to their very high unit power, arc furnaces are among those receivers that generate significant disturbances in the power supply network. These are mainly rapidly changing voltage fluctuations that cause the phenomenon of light flicker. The magnitude of voltage fluctuations depends, among other things, on the value of the short-circuit capacity at the point of connection of the furnaces, the melting phase, the mutual interaction of arc devices, the type of scrap, or the effectiveness of the compensation devices used.
The paper discusses the impact of short-circuit capacity and furnace power on voltage fluctuations.
The dependence of the stable operation of arc devices on the occurring rapidly changing voltage fluctuations is also indicated. In further considerations, the ratio of the network short-circuit capacity Szw to the power during a three-phase short circuit of electrodes with charge Szwt was adopted as a reference point. (…)
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Source: Logistyka Magazine