Analysis of the results of experimental studies of the arc furnace DSP-30

The purpose of this work is to study the influence of the operation of an arc furnace with a capacity of 30 tons on the quality of electricity by conducting experimental studies in the melting shop of the «Li Da Metal Technology» enterprise located in the city of Akhangaran. The object of study is the DSP-30 arc furnace, which is powered by a 30 kVA furnace transformer.

Results. The article presents the results of experimental studies to study the influence of the DSP-30 electric arc furnace on the operation of the electrical network in the smelting shop of the «Li Da Metal Technology» LLC JV enterprise and at the “Sanoat” substation, which supplies the smelting shop with electricity. Oscillograms of voltage and current changes were recorded before and during the melting process. The resulting oscillograms were analyzed using the Fast Fourier Transformation method.

Conclusion. Based on the analysis of the results of the above experimental studies, we can conclude the following: Electric arc furnaces are powerful nonlinear consumers with a dynamically changing electrical load. Therefore, when the furnace is operating in the melting mode, the voltage and current quality indicators sharply deteriorate, and the shape of the curves differs sharply from sinusoidal; The effects of deterioration in power quality indicators are clearly manifested in the secondary winding of a furnace transformer, in the buses of an industrial substation that supplies the station with electricity, then these effects appear in a much more damped state and can be recorded by special analyzers and oscilloscopes; When an electric arc furnace is operating in melting mode, the voltage value differs from the nominal value from 300 to 500 Volts. If the SVG power factor compensation device is not connected in dynamic mode, the voltage deviation can reach 5000 V. In conclusion, it should be noted that the electric arc furnace, as a nonlinear and highly variable consumer, has a significant impact on the deterioration of the quality indicators of electricity. From the point of view of the theory of electric energy quality indicators, this situation is a clear example of the negative impact on the quality indicators of a power source from the consumer.

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